Meeting Abstracts

Total Page:16

File Type:pdf, Size:1020Kb

Meeting Abstracts 228th AAS San Diego, CA – June, 2016 Meeting Abstracts Session Table of Contents 100 – Welcome Address by AAS President Photoionized Plasmas, Tim Kallman (NASA 301 – The Polarization of the Cosmic Meg Urry GSFC) Microwave Background: Current Status and 101 – Kavli Foundation Lecture: Observation 201 – Extrasolar Planets: Atmospheres Future Prospects of Gravitational Waves, Gabriela Gonzalez 202 – Evolution of Galaxies 302 – Bridging Laboratory & Astrophysics: (LIGO) 203 – Bridging Laboratory & Astrophysics: Atomic Physics in X-rays 102 – The NASA K2 Mission Molecules in the mm II 303 – The Limits of Scientific Cosmology: 103 – Galaxies Big and Small 204 – The Limits of Scientific Cosmology: Town Hall 104 – Bridging Laboratory & Astrophysics: Setting the Stage 304 – Star Formation in a Range of Dust & Ices in the mm and X-rays 205 – Small Telescope Research Environments 105 – College Astronomy Education: Communities of Practice: Research Areas 305 – Plenary Talk: From the First Stars and Research, Resources, and Getting Involved Suitable for Small Telescopes Galaxies to the Epoch of Reionization: 20 106 – Small Telescope Research 206 – Plenary Talk: APOGEE: The New View Years of Computational Progress, Michael Communities of Practice: Pro-Am of the Milky Way -- Large Scale Galactic Norman (UC San Diego) Communities of Practice Structure, Jo Bovy (University of Toronto) 308 – Star Formation, Associations, and 107 – Plenary Talk: From Space Archeology 208 – Classification and Properties of Young Stellar Objects in the Milky Way to Serving the World Today: A 20-Year Variables, Binaries and White Dwarfs and 309 – Bridging Laboratory & Astrophysics: Journey from the Jungles of Guatemala to a Stellar Evolution Atomic, Nuclear, & Particles Physics in Network of Satellite Remote Sensing 209 – The Milky Way and Dwarf Galaxies X-rays Facilities Around the World, Daniel Irwin 210 – Bridging Laboratory & Astrophysics: 310 – The Limits of Scientific Cosmology: (NASA) Planetary Physics in the mm and X-rays The Way Forward 109 – Relativistic Astrophysics, Gravitational 211 – The Limits of Scientific Cosmology: 311 – Surveys, Computation, and Lenses & Waves, and CMB Historical and Cosmological Context Instrumentation 110 – Galaxy Clusters 212 – Plenary Talk: The Ocean World 312 – Plenary Talk: Things That Go Bump in 111 – Bridging Laboratory & Astrophysics: Enceladus, Linda Spilker (JPL) the Night: The Transient Radio Sky, Dale Molecules in the mm I 213 – Plenary Talk: MAVEN Observations of Frail (NRAO) 112 – Astronomy Education for All: The 2017 Atmospheric Loss at Mars, Shannon Curry 314 – AGN, QSOs, and Blazars Poster Eclipse, Accessibility and NASA (UC Berkeley) Session 113 – Small Telescope Research 214 – Astronomy Education: In and Out of 315 – Cosmology and CMB Poster Session Communities of Practice: Student-Centered the Classroom, for All Ages, and Around the 316 – Extrasolar Planets Poster Session Communities of Practice Globe Poster Session 317 – Computation, Surveys, and Data Poster 114 – Plenary Talk: The Brightest Pulses in 215 – Galaxies Poster Session Session the Universe, Maura McLaughlin (WVU) 216 – Instrumentation: Space Missions 318 – Molecular Clouds, Interstellar 115 – Plenary Talk: The Galaxy Zoo, Kevin Poster Session Medium, and Dust Poster Session Schawinski (ETH Zurich) 217 – Extremely Cool Stars: Surveys and 319 – Star Formation, Associations, and 116 – Laboratory Astrophysics Poster Session Individual Stars Poster Session Stellar Objects Poster Session 117 – The NASA K2 Mission Poster Session 218 – Variable Stars, Binary and Multiple 320 – Stellar Atmospheres and Circumstellar 118 – Evolution of Galaxies and Galaxy Stellar Systems, and White Dwarfs Poster Disks Poster Session Clusters Poster Session Session 400 – AGN, QSOs, and Blazars 119 – The Sun and the Solar System Poster 219 – Neutron Stars and Supernovae Poster 401 – Extrasolar Planets: Detection Session Session 402 – Blacks Holes and Supernovae 120 – Instrumentation: Ground Based or 300 – 2015 Newton Lacy Pierce Prize 403 – Cosmology and CMB Airborne Poster Session Lecture: The Elephant in the Room: Effects 404 – Extrasolar Planets: Formation and 121 – Observatory Site Protection and Light of Distant, Massive Companions on Dynamics Pollution Poster Session Planetary System Architectures, Heather 405 – Molecular Clouds, HII Regions, and 200 – LAD Plenary Talk: X-ray Spectra and Knutson (CIT) Dust 1 102.02 – K2 Extra-Galactic and Supernova Studies 100 – Welcome Address by AAS President and C17 Meg Urry I will give an overview of the Kepler Extra-Galactic survey - a program using Kepler to search for supernovae, active galactic nuclei, and other transients in galaxies. To date we have found 17 supernova, 101 – Kavli Foundation Lecture: Observation and with 3 more years (through 2018) planned, including the forward-facing C17, we hope to discover 20 - 30 more SN. The of Gravitational Waves, Gabriela Gonzalez 30-minute cadence of Kepler has reveales subtle features in the light- (LIGO) curves of these supernova not detectable with any other survey, including, shock break-out in a large number of SN, improving our 101.01 – Observation of Gravitational Waves understanding of supernova progenitors. We can also search in On September 14 2015, the two LIGO gravitational wave detectors in nearby galaxies for very fast and faint transients, filling in a Hanford, Washington and Livingston, Louisiana registered a nearly previously unaccessible parameter space. Lastly, the precision data of simultaneous signal with time-frequency properties consistent with any discovered type Ia supernova combined with ground based data gravitational-wave emission by the merger of two massive compact can dramatically improve our use of type Ia for determining objects. Further analysis of the signals by the LIGO Scientific distances and measuring the properties of dark energy. Collaboration and Virgo Collaboration revealed that the gravitational waves detected by LIGO came from the merger of a binary black hole Author(s): Bradley E. Tucker1, Peter M. Garnavich5 , Armin (BBH) system approximately 420 Mpc distant (z=0.09) with Rest243 , Edward J. Shaya , Daniel Kasen constituent masses of 36 and 29 M_sun. Institution(s): 1. Australian National University, 2. STScI, 3. UC I will describe the details of the observation, the status of Berkeley, 4. University of Maryland, 5. University of Notre Dame ground-based interferometric detectors, and prospects for future Contributing team(s): The Kepler Extra-Galactic Survey observations in the new era of gravitational wave astronomy. 102.03 – K2 Microlensing and Campaign 9 1 Author(s): Gabriela Gonzalez Campaign 9 of K2 will observe a contiguous 3.7 deg^2 region of the Institution(s): 1. Louisiana State University Galactic bulge in order to search for microlensing events and measure microlens parallaxes. It will also perform targeted follow-up of approximately 50 microlensing events spread throughout the 102 – The NASA K2 Mission Kepler focal plane. Parallax measurements are a critical ingredient This Special Session will highlight science from the K2 mission for measurements of both the lens mass and distance, which during its first two years of operation. A short "Town Hall" contribute to our understanding of the formation of cold exoplanets, presentation by the project will be followed by science talks featuring and the formation of planets as a function of Galactic environment. community members and used to highlight the many types and Additionally, as the first un-targeted, space-based microlensing breadth of K2 science. Additionally, planning for the K2 mission over survey, K2C9 offers us the first chance to measure the masses and the next two years of operation including soliciting community input kinematics of a large population of free-floating planet candidates, will be discussed as well. whose large abundance has been a puzzle since their discovery. 102.01 – The NASA K2 Mission: Exploring Planets, I will review the scientific goals of the K2C9 survey, which will be Stars, and Beyond well underway, and report on the ongoing activity of the K2 The NASA Kepler mission launched in 2009 and observed a single Campaign 9 Microlensing Science Team and the wider microlensing region of the Galaxy for four years. During its lifetime, Kepler community, with a focus on the progress that has been made towards discovered thousands of transiting extrasolar planets and also analyzing K2 data in crowded fields. revolutionized the field of stellar astrophysics thanks to its ability to produce extremely high precision measurements of the brightness of Author(s): Matthew Penny1 stars. After a second reaction wheel failed on the Kepler spacecraft in Institution(s): 1. Ohio State University 2013, the NASA K2 mission was born. K2 has been observing a variety of astrophysical targets in different fields along the ecliptic in 102.04 – DAVE: Discovery and Vetting of K2 ~80 day campaigns since early 2014. While K2 has no single mission Exoplanets goal, the science produced from the K2 mission relates to time NASA's K2 mission is capable of finding planets as small as the Earth variable observations of Solar System objects, extrasolar planets, star around bright, nearby stars. These targets are well-suited for JWST clusters, supernovae, and more. With about two years of scientific follow-up to study their density and atmospheric composition. Such observations completed, K2 has already extended the legacy of the observations will yield a better understanding of the
Recommended publications
  • Fully Automated and Do Not Require Human Intervention
    ВІСНИК КИЇВСЬКОГО НАЦІОНАЛЬНОГО УНІВЕРСИТЕТУ ІМЕНІ ТАРАСА ШЕВЧЕНКА ISSN 1723-273х АСТРОНОМІЯ 1(51)/2014 Засновано 1958 року Викладено результати оригінальних досліджень із питань релятивістської астрофізики. фізики Сон- ця, астрометрії, небесної механіки. Для наукових працівників, аспірантів, студентів старших курсів, які спеціалізуються в галузі астрономії. Изложены результаты оригинальных исследований по вопросам релятивистской астрофізики, фи- зики Солнца, астрометрии, небесной механики. Для научных работников, аспирантов, студентов старших курсов, специализирующихся в области астрономии. The Herald includes results of original investigations on relativistic astrophysics, solar physics, astrom- etry, celestial mechanics. It is intended for scientists, post-graduate students and student-astronomers. ВІДПОВІДАЛЬНИЙ РЕДАКТОР В.М. Івченко, д-р фіз.-мат. наук, проф. РЕДАКЦІЙНА В.М. Єфіменко, канд. фіз.-мат. наук (заст. відп. ред.); О.В. Федорова, КОЛЕГІЯ канд. фіз.-мат. наук (відп. секр.); Б.І. Гнатик, д-р фіз.-мат. наук; В.І. Жданов, д-р фіз.-мат. наук; В.В. Клещонок, канд. фіз.-мат. наук; Р.І. Костик, д-р фіз.-мат. наук; В.Г. Лозицький, д-р фіз.-мат. наук; Г.П. Міліневський, д-р фіз.-мат. наук; С.Л. Парновський, д-р фіз.-мат. наук; І.Д. Караченцев, д-р фіз.-мат.наук; О.А. Соловйов, д-р фіз.-мат. наук; К.І. Чурюмов, д-р фіз.-мат. наук. Адреса редколегії 04053, Київ-53, вул. Обсерваторна, 3, Астрономічна обсерваторія (38044) 486 26 91, 481 44 78, [email protected] Затверджено Вченою радою Астрономічної обсерваторії 05.06.2014 (протокол № 9) Атестовано Вищою атестаційною комісією України. Постанова Президії ВАК України № 1-05/5 від 01.07.2010 Зареєстровано Міністерством інформації України. Свідоцтво про державну реєстрацію КВ № 20329-101129 Р від 25.07.2013 Засновник Київський національний університет імені Тараса Шевченка, та видавець Видавничо-поліграфічний центр "Київський університет" Свідоцтво внесено до Державного реєстру ДК № 1103 від 31.10.02 Адреса видавця 01601, Київ-601, б-р Т.Шевченка, 14, кімн.
    [Show full text]
  • Instrumental Performance and Results from Testing of the BLAST-TNG Receiver, Submillimeter Optics, and MKID Arrays
    Instrumental performance and results from testing of the BLAST-TNG receiver, submillimeter optics, and MKID arrays Nicholas Galitzkia, Peter Adeb, Francesco E. Angil`ea, Peter Ashtonc, Jason Austermannd, Tashalee Billingsa, George Chee, Hsiao-Mei Chof, Kristina Davise, Mark Devlina, Simon Dickera, Bradley J. Dobera, Laura M. Fisselc, Yasuo Fukuig, Jiansong Gaod, Samuel Gordone, Christopher E. Groppie, Seth Hillbranda, Gene C. Hiltond, Johannes Hubmayrd, Kent D. Irwinh, Jeffrey Kleina, Dale Lif, Zhi-Yun Lii, Nathan P. Louriea, Ian Lowea, Hamdi Manie, Peter G. Martinj, Philip Mauskopfe, Christopher McKenneyd, Federico Natia, Giles Novakc, Enzo Pascaleb, Giampaolo Pisanob, Fabio P. Santosc, Douglas Scottk, Adrian Sinclaire, Juan D. Solerl, Carole Tuckerb, Matthew Underhille, Michael Vissersd, and Paul Williamsc aUniversity of Pennsylvania, 209 S 33rd St, Philadelphia, PA, USA bUniversity of Cardiff, The Parade, Cardiff, United Kingdom cCenter for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics & Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA dNational Institute of Standards and Technology, 325 Broadway, Boulder, CO, USA eArizona State University, PO Box 871404, Tempe, AZ, USA fSLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, USA gNagoya University, Furocho, Chikusa Ward, Nagoya, Aichi Prefecture, Japan hStanford University, 382 Via Pueblo Mall, Stanford, CA, USA iUniversity of Virginia, 530 McCormick Road, Charlottesville, VA, USA jUniversity of Toronto, 60 St. George Street, Toronto, ON, Canada lUniversity of British Columbia, 6224 Agricultural Road, Vancouver, BC, Canada kLaboratoire AIM, Paris-Saclay, CEA/IRFU/SAp - CNRS - Universit´eParis Diderot, 91191, Gif-sur-Yvette Cedex, France ABSTRACT Polarized thermal emission from interstellar dust grains can be used to map magnetic fields in star forming molecular clouds and the diffuse interstellar medium (ISM).
    [Show full text]
  • Requirements of Timely Performance in Time and Voyage Charterparties
    Graduate School REQUIREMENTS OF TIMELY PERFORMANCE IN TIME AND VOYAGE CHARTERPARTIES - AN EXPLORATION OF THEIR IDENTITY, SCOPE AND LIMITATIONS UNDER ENGLISH LAW Thesis submitted for the degree of Doctor of Philosophy at the University of Leicester by Tamaraudoubra Tom Egbe School of Law University of Leicester 2019 Abstract REQUIREMENTS OF TIMELY PERFORMANCE IN TIME AND VOYAGE CHARTERPARTIES - AN EXPLORATION OF THEIR IDENTITY, SCOPE AND LIMITATIONS UNDER ENGLISH LAW By Tamaraudoubra Tom Egbe The importance of time in the performance of contractual obligations under sea carriage of goods arrangements are until now little explored. For the avoidance of breach, certain obligations and responsibilities of the parties to the contract need to be performed promptly. Ocean transport is an expensive venture and a shipowner could suffer considerable financial losses if an unnecessary but serious delay interrupt the vessel’s earning power in the course of the charterer’s performance of his contractual obligation. On the other hand, a charterer could also incur a substantial loss if arrangements for the shipment and receipt of cargo fail to go according to plan as a result of the shipowner’s failure to perform his charterparty obligation timely and with reasonable diligence. With these considerations in mind, this thesis critically explores the concept of timely performance in the discharge of the contractual obligations of parties to a contract of carriage. While the thesis is not an expository of the occurrence of time in all the obligations of parties to the carriage contract, it focusses particularly on the identity, scope, and limitations of timeliness in the context of timely payment of hire, laytime and reasonable despatch.
    [Show full text]
  • A Hot Subdwarf-White Dwarf Super-Chandrasekhar Candidate
    A hot subdwarf–white dwarf super-Chandrasekhar candidate supernova Ia progenitor Ingrid Pelisoli1,2*, P. Neunteufel3, S. Geier1, T. Kupfer4,5, U. Heber6, A. Irrgang6, D. Schneider6, A. Bastian1, J. van Roestel7, V. Schaffenroth1, and B. N. Barlow8 1Institut fur¨ Physik und Astronomie, Universitat¨ Potsdam, Haus 28, Karl-Liebknecht-Str. 24/25, D-14476 Potsdam-Golm, Germany 2Department of Physics, University of Warwick, Coventry, CV4 7AL, UK 3Max Planck Institut fur¨ Astrophysik, Karl-Schwarzschild-Straße 1, 85748 Garching bei Munchen¨ 4Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA 5Texas Tech University, Department of Physics & Astronomy, Box 41051, 79409, Lubbock, TX, USA 6Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg (FAU), Sternwartstr. 7, 96049 Bamberg, Germany 7Division of Physics, Mathematics and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA 8Department of Physics and Astronomy, High Point University, High Point, NC 27268, USA *[email protected] ABSTRACT Supernova Ia are bright explosive events that can be used to estimate cosmological distances, allowing us to study the expansion of the Universe. They are understood to result from a thermonuclear detonation in a white dwarf that formed from the exhausted core of a star more massive than the Sun. However, the possible progenitor channels leading to an explosion are a long-standing debate, limiting the precision and accuracy of supernova Ia as distance indicators. Here we present HD 265435, a binary system with an orbital period of less than a hundred minutes, consisting of a white dwarf and a hot subdwarf — a stripped core-helium burning star.
    [Show full text]
  • August 13 2016 7:00Pm at the Herrett Center for Arts & Science College of Southern Idaho
    Snake River Skies The Newsletter of the Magic Valley Astronomical Society www.mvastro.org Membership Meeting President’s Message Saturday, August 13th 2016 7:00pm at the Herrett Center for Arts & Science College of Southern Idaho. Public Star Party Follows at the Colleagues, Centennial Observatory Club Officers It's that time of year: The City of Rocks Star Party. Set for Friday, Aug. 5th, and Saturday, Aug. 6th, the event is the gem of the MVAS year. As we've done every Robert Mayer, President year, we will hold solar viewing at the Smoky Mountain Campground, followed by a [email protected] potluck there at the campground. Again, MVAS will provide the main course and 208-312-1203 beverages. Paul McClain, Vice President After the potluck, the party moves over to the corral by the bunkhouse over at [email protected] Castle Rocks, with deep sky viewing beginning sometime after 9 p.m. This is a chance to dig into some of the darkest skies in the west. Gary Leavitt, Secretary [email protected] Some members have already reserved campsites, but for those who are thinking of 208-731-7476 dropping by at the last minute, we have room for you at the bunkhouse, and would love to have to come by. Jim Tubbs, Treasurer / ALCOR [email protected] The following Saturday will be the regular MVAS meeting. Please check E-mail or 208-404-2999 Facebook for updates on our guest speaker that day. David Olsen, Newsletter Editor Until then, clear views, [email protected] Robert Mayer Rick Widmer, Webmaster [email protected] Magic Valley Astronomical Society is a member of the Astronomical League M-51 imaged by Rick Widmer & Ken Thomason Herrett Telescope Shotwell Camera https://herrett.csi.edu/astronomy/observatory/City_of_Rocks_Star_Party_2016.asp Calendars for August Sun Mon Tue Wed Thu Fri Sat 1 2 3 4 5 6 New Moon City Rocks City Rocks Lunation 1158 Castle Rocks Castle Rocks Star Party Star Party Almo, ID Almo, ID 7 8 9 10 11 12 13 MVAS General Mtg.
    [Show full text]
  • Správa O Činnosti Organizácie SAV Za Rok 2017
    Astronomický ústav SAV Správa o činnosti organizácie SAV za rok 2017 Tatranská Lomnica január 2018 Obsah osnovy Správy o činnosti organizácie SAV za rok 2017 1. Základné údaje o organizácii 2. Vedecká činnosť 3. Doktorandské štúdium, iná pedagogická činnosť a budovanie ľudských zdrojov pre vedu a techniku 4. Medzinárodná vedecká spolupráca 5. Vedná politika 6. Spolupráca s VŠ a inými subjektmi v oblasti vedy a techniky 7. Spolupráca s aplikačnou a hospodárskou sférou 8. Aktivity pre Národnú radu SR, vládu SR, ústredné orgány štátnej správy SR a iné organizácie 9. Vedecko-organizačné a popularizačné aktivity 10. Činnosť knižnično-informačného pracoviska 11. Aktivity v orgánoch SAV 12. Hospodárenie organizácie 13. Nadácie a fondy pri organizácii SAV 14. Iné významné činnosti organizácie SAV 15. Vyznamenania, ocenenia a ceny udelené organizácii a pracovníkom organizácie SAV 16. Poskytovanie informácií v súlade so zákonom o slobodnom prístupe k informáciám 17. Problémy a podnety pre činnosť SAV PRÍLOHY A Zoznam zamestnancov a doktorandov organizácie k 31.12.2017 B Projekty riešené v organizácii C Publikačná činnosť organizácie D Údaje o pedagogickej činnosti organizácie E Medzinárodná mobilita organizácie F Vedecko-popularizačná činnosť pracovníkov organizácie SAV Správa o činnosti organizácie SAV 1. Základné údaje o organizácii 1.1. Kontaktné údaje Názov: Astronomický ústav SAV Riaditeľ: Mgr. Martin Vaňko, PhD. Zástupca riaditeľa: Mgr. Peter Gömöry, PhD. Vedecký tajomník: Mgr. Marián Jakubík, PhD. Predseda vedeckej rady: RNDr. Luboš Neslušan, CSc. Člen snemu SAV: Mgr. Marián Jakubík, PhD. Adresa: Astronomický ústav SAV, 059 60 Tatranská Lomnica http://www.ta3.sk Tel.: 052/7879111 Fax: 052/4467656 E-mail: [email protected] Názvy a adresy detašovaných pracovísk: Astronomický ústav - Oddelenie medziplanetárnej hmoty Dúbravská cesta 9, 845 04 Bratislava Vedúci detašovaných pracovísk: Astronomický ústav - Oddelenie medziplanetárnej hmoty prof.
    [Show full text]
  • Effemeridi Astronomiche (Di Milano) Dall'ab. A. De Cesaris [And Others]
    Informazioni su questo libro Si tratta della copia digitale di un libro che per generazioni è stato conservata negli scaffali di una biblioteca prima di essere digitalizzato da Google nell’ambito del progetto volto a rendere disponibili online i libri di tutto il mondo. Ha sopravvissuto abbastanza per non essere più protetto dai diritti di copyright e diventare di pubblico dominio. Un libro di pubblico dominio è un libro che non è mai stato protetto dal copyright o i cui termini legali di copyright sono scaduti. La classificazione di un libro come di pubblico dominio può variare da paese a paese. I libri di pubblico dominio sono l’anello di congiunzione con il passato, rappresentano un patrimonio storico, culturale e di conoscenza spesso difficile da scoprire. Commenti, note e altre annotazioni a margine presenti nel volume originale compariranno in questo file, come testimonianza del lungo viaggio percorso dal libro, dall’editore originale alla biblioteca, per giungere fino a te. Linee guide per l’utilizzo Google è orgoglioso di essere il partner delle biblioteche per digitalizzare i materiali di pubblico dominio e renderli universalmente disponibili. I libri di pubblico dominio appartengono al pubblico e noi ne siamo solamente i custodi. Tuttavia questo lavoro è oneroso, pertanto, per poter continuare ad offrire questo servizio abbiamo preso alcune iniziative per impedire l’utilizzo illecito da parte di soggetti commerciali, compresa l’imposizione di restrizioni sull’invio di query automatizzate. Inoltre ti chiediamo di: + Non fare un uso commerciale di questi file Abbiamo concepito Google Ricerca Libri per l’uso da parte dei singoli utenti privati e ti chiediamo di utilizzare questi file per uso personale e non a fini commerciali.
    [Show full text]
  • The Arches Cluster out to Its Tidal Radius: Dynamical Mass Segregation and the Effect of the Extinction Law on the Stellar Mass Function
    Astronomy & Astrophysics manuscript no. aa˙paper c ESO 2018 October 31, 2018 The Arches cluster out to its tidal radius: dynamical mass segregation and the effect of the extinction law on the stellar mass function. ? M. Habibi1;3 , A. Stolte1 , W. Brandner2 , B. Hußmann1 , K. Motohara4 1 Argelander Institut fur¨ Astronomie, Universitat¨ Bonn, Auf dem Hugel¨ 71, 53121 Bonn, Germany e-mail: [mhabibi;astolte;hussmann]@astro.uni-bonn.de 2 Max-Planck-Institut fur¨ Astronomie, Konigsstuhl¨ 17, 69117 Heidelberg, Germany e-mail: [email protected] 3 Member of the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne. 4 Institute of Astronomy, The University of Tokyo, Osawa 2-21-1, Mitaka, Tokyo 181-0015, Japan e-mail: [email protected] Received Oct 14, 2012; accepted May 13, 2013 ABSTRACT The Galactic center is the most active site of star formation in the Milky Way Galaxy, where particularly high-mass stars have formed very recently and are still forming today. However, since we are looking at the Galactic center through the Galactic disk, knowledge of extinction is crucial when studying this region. The Arches cluster is a young, massive starburst cluster near the Galactic center. We observed the Arches cluster out to its tidal radius using Ks-band imaging obtained with NAOS/CONICA at the VLT combined with Subaro/Cisco J-band data to gain a full understanding of the cluster mass distribution. We show that the determination of the mass of the most massive star in the Arches cluster, which had been used in previous studies to establish an upper mass limit for the star formation process in the Milky Way, strongly depends on the assumed slope of the extinction law.
    [Show full text]
  • The Extragalactic Distance Scale
    The Extragalactic Distance Scale Published in "Stellar astrophysics for the local group" : VIII Canary Islands Winter School of Astrophysics. Edited by A. Aparicio, A. Herrero, and F. Sanchez. Cambridge ; New York : Cambridge University Press, 1998 Calibration of the Extragalactic Distance Scale By BARRY F. MADORE1, WENDY L. FREEDMAN2 1NASA/IPAC Extragalactic Database, Infrared Processing & Analysis Center, California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA 91125, USA 2Observatories, Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena CA 91101, USA The calibration and use of Cepheids as primary distance indicators is reviewed in the context of the extragalactic distance scale. Comparison is made with the independently calibrated Population II distance scale and found to be consistent at the 10% level. The combined use of ground-based facilities and the Hubble Space Telescope now allow for the application of the Cepheid Period-Luminosity relation out to distances in excess of 20 Mpc. Calibration of secondary distance indicators and the direct determination of distances to galaxies in the field as well as in the Virgo and Fornax clusters allows for multiple paths to the determination of the absolute rate of the expansion of the Universe parameterized by the Hubble constant. At this point in the reduction and analysis of Key Project galaxies H0 = 72km/ sec/Mpc ± 2 (random) ± 12 [systematic]. Table of Contents INTRODUCTION TO THE LECTURES CEPHEIDS BRIEF SUMMARY OF THE OBSERVED PROPERTIES OF CEPHEID
    [Show full text]
  • SPIDER Experiment
    Searching for the echoes of inflation with H. Cynthia Chiang University of KwaZulu-Natal Madrid: CMB, LSS, 21cm June 24, 2016 B mode polarization in the CMB E modes are the CMB's “intrinsic polarization” We expect them to be there because of scattering processes in the CMB Temperature anisotropies predict E-mode spectra with almost no extra information Not only that, but “standard” CMB scattering physics generates ONLY E modes. Why do we care about B modes? Inflation: exponential expansion of universe (x 1025) at 10-35 sec after big bang creates a gravitational wave background that leaves a B-mode imprint on CMB polarization. Gravitational lensing by large scale structure converts some of the E-mode polarization to B-mode. Use this to study structure formation, “weigh” neutrinos. How can we tell the difference between the above two? Degree vs. arcminute angular scales. The moral of the story: B modes tell us things about the universe that temperature and E modes can't. Inflation scorecard Inflation predicts: Our universe (Planck 2015): A flat universe Ωk = 0.000 ± 0.0025 with nearly scale-invariant ns = 0.968 ± 0.006 density fluctuations, well described by a power law, dns / d lnk = -0.0065 ± 0.0076 with scalar perturbations r0.002 < 0.01 (at 2σ) that are Gaussian fNL = 2.5 ± 5.7 and adiabatic, βiso < 0.03 (at 2σ) with a negligible contribution from topological defects f10 < 0.04 (Adapted from Martin White) Constraining inflation Planck 2015 CMB polarization power spectra E-mode E-mode is mainly sourced by density fluctuations and is the intrinsic polarization of the CMB Degree-scale B-mode from gravitational waves, amplitude described by the tensor-to-scalar ratio r.
    [Show full text]
  • Star Formation at the Galactic Center
    Star Formation at the Galactic Center Mark Morris UCLA Outline § The Arena – central molecular zone, & the twisted ring § General dearth of star formation, relative to amount of gas § Orbital infuence on star formation § Mode of star formation: Massive young clusters vs. isolated YSOs § Star formation in the Central parsec § Cyclical star formation in the central parsec ? § Magnetic felds – a pitch for HAWC+ The inner Central Molecular Zone Molinari et al. 2011 … Herschel/SPIRE 250 µm Martin et al. 2004 7 CMZ: ~3 x 10 M8, ±170 pc Warm, turbulent molecular gas" Having large-scale order." overhead view of the! Molinari et al. 2011 twisted ring" Simulation of gas ! distribution in the CMZ" (Sungsoo Kim + 2011)" Henshaw et al. 2016 Top: HNCO, extracted using SCOUSE* *SCOUSE: Semi-automated mul-COmponent Universal Spectral-line fing Engine H2 column density contours from Herschel observations Color-coded to show velocity dispersion. Possible models: Henshaw et al. 2016 (Batersby et al., in prep) Henshaw+16 u Gas distribution dominated by two roughly parallel extended features in longitude-velocity space. u Henshaw+16 à the bulk of molecular line emission associated with the 20 & 50 km/s clouds is just a small segment of one of the extended features, in agreement with the Kruijssen+15 orbit, which places the clouds at a Galactocentric radius of ∼60 pc. u But this in inconsistent with the evidence that Sgr A East is interacting with the 50 km/s cloud and that the 20 km/s cloud is feeding gas into the central parsecs. Star Formation in the CMZ ♦ It has been known for some time that the CMZ has a much higher ratio of dense gas mass to star-formation tracers than elsewhere in the Galaxy [Morris 1989, 1993, Lis & Carlstrom 1994, Yusef-Zadeh et al.
    [Show full text]
  • Lucan's Natural Questions: Landscape and Geography in the Bellum Civile Laura Zientek a Dissertation Submitted in Partial Fulf
    Lucan’s Natural Questions: Landscape and Geography in the Bellum Civile Laura Zientek A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy University of Washington 2014 Reading Committee: Catherine Connors, Chair Alain Gowing Stephen Hinds Program Authorized to Offer Degree: Classics © Copyright 2014 Laura Zientek University of Washington Abstract Lucan’s Natural Questions: Landscape and Geography in the Bellum Civile Laura Zientek Chair of the Supervisory Committee: Professor Catherine Connors Department of Classics This dissertation is an analysis of the role of landscape and the natural world in Lucan’s Bellum Civile. I investigate digressions and excurses on mountains, rivers, and certain myths associated aetiologically with the land, and demonstrate how Stoic physics and cosmology – in particular the concepts of cosmic (dis)order, collapse, and conflagration – play a role in the way Lucan writes about the landscape in the context of a civil war poem. Building on previous analyses of the Bellum Civile that provide background on its literary context (Ahl, 1976), on Lucan’s poetic technique (Masters, 1992), and on landscape in Roman literature (Spencer, 2010), I approach Lucan’s depiction of the natural world by focusing on the mutual effect of humanity and landscape on each other. Thus, hardships posed by the land against characters like Caesar and Cato, gloomy and threatening atmospheres, and dangerous or unusual weather phenomena all have places in my study. I also explore how Lucan’s landscapes engage with the tropes of the locus amoenus or horridus (Schiesaro, 2006) and elements of the sublime (Day, 2013).
    [Show full text]