2010 VA-100 Proceedings.Pdf
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
On the Origin and Propagation of Ultra-High Energy Cosmic Rays (Measurements & Prediction Techniques)
Dissertation On the Origin and Propagation of Ultra-High Energy Cosmic Rays (Measurements & Prediction Techniques) Nils Nierstenhoefer Wuppertal, 2011 University of Wuppertal Supervisor/First reviewer: Prof. Dr. K.-H. Kampert Second reviewer: Prof. Dr. M. Risse Motivation & Preface It is a long known fact that cosmic rays reach Earth with tremendous energies of even above 1020 eV. Despite of decades of intensive research, it was not possible to finally reveal the origin of these par- ticles. The main obstacle in this field is their rare occurrence. This is due to a very steep energy spectrum. To make this point more clear, one roughly expects to observe less than one particle per km2 in one century exceeding energies larger than 1020 eV. To overcome the limitation of low statis- tics, larger and larger cosmic ray detectors have been deployed. Today’s largest cosmic ray detector is the Pierre Auger observatory (PAO) which was constructed in the Pampa Amarilla in Argentina. It covers an area of 3000 km2 and provides the largest set of observations of ultra-high energy cosmic rays (UHECR) in history. A second difficulty in understanding the origin of UHECR should be pointed out: Galactic and extra- galactic magnetic fields might alter the direction of even the highest energy events in a way that they do not point back to their source. In 2007 and 2008, already before the completion of the full detector, the Auger collaboration pub- lished a set of three important papers [1, 2, 3]. The first paper dealt with the correlation of the arrival directions of the highest energetic events with the distribution of active galactic nuclei (AGN) closer than 75Mpc from a catalog compiled by Veron-Cetty and Veron (VC-V) [4]. -
JOHN R. THORSTENSEN Address
CURRICULUM VITAE: JOHN R. THORSTENSEN Address: Department of Physics and Astronomy Dartmouth College 6127 Wilder Laboratory Hanover, NH 03755-3528; (603)-646-2869 [email protected] Undergraduate Studies: Haverford College, B. A. 1974 Astronomy and Physics double major, High Honors in both. Graduate Studies: Ph. D., 1980, University of California, Berkeley Astronomy Department Dissertation : \Optical Studies of Faint Blue X-ray Stars" Graduate Advisor: Professor C. Stuart Bowyer Employment History: Department of Physics and Astronomy, Dartmouth College: { Professor, July 1991 { present { Associate Professor, July 1986 { July 1991 { Assistant Professor, September 1980 { June 1986 Research Assistant, Space Sciences Lab., U.C. Berkeley, 1975 { 1980. Summer Student, National Radio Astronomy Observatory, 1974. Summer Student, Bartol Research Foundation, 1973. Consultant, IBM Corporation, 1973. (STARMAP program). Honors and Awards: Phi Beta Kappa, 1974. National Science Foundation Graduate Fellow, 1974 { 1977. Dorothea Klumpke Roberts Award of the Berkeley Astronomy Dept., 1978. Professional Societies: American Astronomical Society Astronomical Society of the Pacific International Astronomical Union Lifetime Publication List * \Can Collapsed Stars Close the Universe?" Thorstensen, J. R., and Partridge, R. B. 1975, Ap. J., 200, 527. \Optical Identification of Nova Scuti 1975." Raff, M. I., and Thorstensen, J. 1975, P. A. S. P., 87, 593. \Photometry of Slow X-ray Pulsars II: The 13.9 Minute Period of X Persei." Margon, B., Thorstensen, J., Bowyer, S., Mason, K. O., White, N. E., Sanford, P. W., Parkes, G., Stone, R. P. S., and Bailey, J. 1977, Ap. J., 218, 504. \A Spectrophotometric Survey of the A 0535+26 Field." Margon, B., Thorstensen, J., Nelson, J., Chanan, G., and Bowyer, S. -
Nova Report 2006-2007
NOVA REPORTNOVA 2006 - 2007 NOVA REPORT 2006-2007 Illustration on the front cover The cover image shows a composite image of the supernova remnant Cassiopeia A (Cas A). This object is the brightest radio source in the sky, and has been created by a supernova explosion about 330 year ago. The star itself had a mass of around 20 times the mass of the sun, but by the time it exploded it must have lost most of the outer layers. The red and green colors in the image are obtained from a million second observation of Cas A with the Chandra X-ray Observatory. The blue image is obtained with the Very Large Array at a wavelength of 21.7 cm. The emission is caused by very high energy electrons swirling around in a magnetic field. The red image is based on the ratio of line emission of Si XIII over Mg XI, which brings out the bi-polar, jet-like, structure. The green image is the Si XIII line emission itself, showing that most X-ray emission comes from a shell of stellar debris. Faintly visible in green in the center is a point-like source, which is presumably the neutron star, created just prior to the supernova explosion. Image credits: Creation/compilation: Jacco Vink. The data were obtained from: NASA Chandra X-ray observatory and Very Large Array (downloaded from Astronomy Digital Image Library http://adil.ncsa.uiuc. edu). Related scientific publications: Hwang, Vink, et al., 2004, Astrophys. J. 615, L117; Helder and Vink, 2008, Astrophys. J. in press. -
From Messier to Abell: 200 Years of Science with Galaxy Clusters
Constructing the Universe with Clusters of Galaxies, IAP 2000 meeting, Paris (France) July 2000 Florence Durret & Daniel Gerbal eds. FROM MESSIER TO ABELL: 200 YEARS OF SCIENCE WITH GALAXY CLUSTERS Andrea BIVIANO Osservatorio Astronomico di Trieste via G.B. Tiepolo 11 – I-34131 Trieste, Italy [email protected] 1 Introduction The history of the scientific investigation of galaxy clusters starts with the XVIII century, when Charles Messier and F. Wilhelm Herschel independently produced the first catalogues of nebulæ, and noticed remarkable concentrations of nebulæ on the sky. Many astronomers of the XIX and early XX century investigated the distribution of nebulæ in order to understand their relation to the local “sidereal system”, the Milky Way. The question they were trying to answer was whether or not the nebulæ are external to our own galaxy. The answer came at the beginning of the XX century, mainly through the works of V.M. Slipher and E. Hubble (see, e.g., Smith424). The extragalactic nature of nebulæ being established, astronomers started to consider clus- ters of galaxies as physical systems. The issue of how clusters form attracted the attention of K. Lundmark287 as early as in 1927. Six years later, F. Zwicky512 first estimated the mass of a galaxy cluster, thus establishing the need for dark matter. The role of clusters as laboratories for studying the evolution of galaxies was also soon realized (notably with the collisional stripping theory of Spitzer & Baade430). In the 50’s the investigation of galaxy clusters started to cover all aspects, from the distri- bution and properties of galaxies in clusters, to the existence of sub- and super-clustering, from the origin and evolution of clusters, to their dynamical status, and the nature of dark matter (or “positive energy”, see e.g., Ambartsumian29). -
Meeting Program
A A S MEETING PROGRAM 211TH MEETING OF THE AMERICAN ASTRONOMICAL SOCIETY WITH THE HIGH ENERGY ASTROPHYSICS DIVISION (HEAD) AND THE HISTORICAL ASTRONOMY DIVISION (HAD) 7-11 JANUARY 2008 AUSTIN, TX All scientific session will be held at the: Austin Convention Center COUNCIL .......................... 2 500 East Cesar Chavez St. Austin, TX 78701 EXHIBITS ........................... 4 FURTHER IN GRATITUDE INFORMATION ............... 6 AAS Paper Sorters SCHEDULE ....................... 7 Rachel Akeson, David Bartlett, Elizabeth Barton, SUNDAY ........................17 Joan Centrella, Jun Cui, Susana Deustua, Tapasi Ghosh, Jennifer Grier, Joe Hahn, Hugh Harris, MONDAY .......................21 Chryssa Kouveliotou, John Martin, Kevin Marvel, Kristen Menou, Brian Patten, Robert Quimby, Chris Springob, Joe Tenn, Dirk Terrell, Dave TUESDAY .......................25 Thompson, Liese van Zee, and Amy Winebarger WEDNESDAY ................77 We would like to thank the THURSDAY ................. 143 following sponsors: FRIDAY ......................... 203 Elsevier Northrop Grumman SATURDAY .................. 241 Lockheed Martin The TABASGO Foundation AUTHOR INDEX ........ 242 AAS COUNCIL J. Craig Wheeler Univ. of Texas President (6/2006-6/2008) John P. Huchra Harvard-Smithsonian, President-Elect CfA (6/2007-6/2008) Paul Vanden Bout NRAO Vice-President (6/2005-6/2008) Robert W. O’Connell Univ. of Virginia Vice-President (6/2006-6/2009) Lee W. Hartman Univ. of Michigan Vice-President (6/2007-6/2010) John Graham CIW Secretary (6/2004-6/2010) OFFICERS Hervey (Peter) STScI Treasurer Stockman (6/2005-6/2008) Timothy F. Slater Univ. of Arizona Education Officer (6/2006-6/2009) Mike A’Hearn Univ. of Maryland Pub. Board Chair (6/2005-6/2008) Kevin Marvel AAS Executive Officer (6/2006-Present) Gary J. Ferland Univ. of Kentucky (6/2007-6/2008) Suzanne Hawley Univ. -
Arxiv:Astro-Ph/0007126V1 11 Jul 2000
The Infall Region of Abell 576: Independent Mass and Light Profiles Kenneth Rines and Margaret J. Geller Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138 krines, [email protected] Antonaldo Diaferio Universit`adegli Studi di Torino, Dipartimento di Fisica Generale “Amedeo Avogadro”, Torino, Italy Joseph J. Mohr1 Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637 Gary A. Wegner Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755 ABSTRACT We describe observations of the nearby (cz = 11, 487 km s−1) cluster of galaxies Abell 576 beyond the virial radius and into the infall region where galaxies are on their first or second pass through the cluster. Using 1057 redshifts, we use the infall pattern in redshift space to determine the mass profile of A576 to a radius of ∼ 4 h−1Mpc. This mass estimation technique makes no assumptions about the equilibrium state of the cluster. Within ∼ 1 h−1Mpc, the mass profile we derive exceeds that determined from X-ray observations by arXiv:astro-ph/0007126v1 11 Jul 2000 a factor of ∼ 2.5. At ∼ 2.5 h−1Mpc, however, the mass profile agrees with virial mass estimates. Our mass profile is consistent with a Navarro, Frenk, & White (1997) or Hernquist (1990) profile, but it is inconsistent with an isothermal sphere. R-band images of a 3◦ × 3◦ region centered on the cluster allow an independent determination of the cluster light profile. We calculate the integrated mass-to-light ratio as a function of cluster radius; it decreases −1 smoothly from the core to M/LR ∼ 300h at ∼ 4 h Mpc. -
A Search for Transiting Extrasolar Planets in the Open Cluster NGC 4755
ResearchOnline@JCU This file is part of the following reference: Jayawardene, Bandupriya S. (2015) A search for transiting extrasolar planets in the open cluster NGC 4755. DAstron thesis, James Cook University. Access to this file is available from: http://researchonline.jcu.edu.au/41511/ The author has certified to JCU that they have made a reasonable effort to gain permission and acknowledge the owner of any third party copyright material included in this document. If you believe that this is not the case, please contact [email protected] and quote http://researchonline.jcu.edu.au/41511/ A SEARCH FOR TRANSITING EXTRASOLAR PLANETS IN THE OPEN CLUSTER NGC 4755 by Bandupriya S. Jayawardene A thesis submitted in satisfaction of the requirements for the degree of Doctor of Astronomy in the Faculty of Science, Technology and Engineering June 2015 James Cook University Townsville - Australia i STATEMENT OF ACCESS I the undersigned, author of this work, understand that James Cook University will make this thesis available for use within the University Library and, via the Australian Digital Thesis network, for use elsewhere. I understand that, as an unpublished work, a thesis has significant protection under the Copyright Act and; I do not wish to place any further restriction on access to this work. 2 STATEMENT OF SOURCES DECLARATION I declare that this thesis is my own work and has not been submitted in any form for another degree or diploma at any University or other institution of tertiary education. Information derived from the published or unpublished work of others has been acknowledged in the text and list of references is given. -
Downloads/ Astero2007.Pdf) and by Aerts Et Al (2010)
This work is protected by copyright and other intellectual property rights and duplication or sale of all or part is not permitted, except that material may be duplicated by you for research, private study, criticism/review or educational purposes. Electronic or print copies are for your own personal, non- commercial use and shall not be passed to any other individual. No quotation may be published without proper acknowledgement. For any other use, or to quote extensively from the work, permission must be obtained from the copyright holder/s. i Fundamental Properties of Solar-Type Eclipsing Binary Stars, and Kinematic Biases of Exoplanet Host Stars Richard J. Hutcheon Submitted in accordance with the requirements for the degree of Doctor of Philosophy. Research Institute: School of Environmental and Physical Sciences and Applied Mathematics. University of Keele June 2015 ii iii Abstract This thesis is in three parts: 1) a kinematical study of exoplanet host stars, 2) a study of the detached eclipsing binary V1094 Tau and 3) and observations of other eclipsing binaries. Part I investigates kinematical biases between two methods of detecting exoplanets; the ground based transit and radial velocity methods. Distances of the host stars from each method lie in almost non-overlapping groups. Samples of host stars from each group are selected. They are compared by means of matching comparison samples of stars not known to have exoplanets. The detection methods are found to introduce a negligible bias into the metallicities of the host stars but the ground based transit method introduces a median age bias of about -2 Gyr. -
Proto-Planetary Nebula Observing Guide
Proto-Planetary Nebula Observing Guide www.reinervogel.net RA Dec CRL 618 Westbrook Nebula 04h 42m 53.6s +36° 06' 53" PK 166-6 1 HD 44179 Red Rectangle 06h 19m 58.2s -10° 38' 14" V777 Mon OH 231.8+4.2 Rotten Egg N. 07h 42m 16.8s -14° 42' 52" Calabash N. IRAS 09371+1212 Frosty Leo 09h 39m 53.6s +11° 58' 54" CW Leonis Peanut Nebula 09h 47m 57.4s +13° 16' 44" Carbon Star with dust shell M 2-9 Butterfly Nebula 17h 05m 38.1s -10° 08' 33" PK 10+18 2 IRAS 17150-3224 Cotton Candy Nebula 17h 18m 20.0s -32° 27' 20" Hen 3-1475 Garden-sprinkler Nebula 17h 45m 14. 2s -17° 56' 47" IRAS 17423-1755 IRAS 17441-2411 Silkworm Nebula 17h 47m 13.5s -24° 12' 51" IRAS 18059-3211 Gomez' Hamburger 18h 09m 13.3s -32° 10' 48" MWC 922 Red Square Nebula 18h 21m 15s -13° 01' 27" IRAS 19024+0044 19h 05m 02.1s +00° 48' 50.9" M 1-92 Footprint Nebula 19h 36m 18.9s +29° 32' 50" Minkowski's Footprint IRAS 20068+4051 20h 08m 38.5s +41° 00' 37" CRL 2688 Egg Nebula 21h 02m 18.8s +36° 41' 38" PK 80-6 1 IRAS 22036+5306 22h 05m 30.3s +53° 21' 32.8" IRAS 23166+1655 23h 19m 12.6s +17° 11' 33.1" Southern Objects ESO 172-7 Boomerang Nebula 12h 44m 45.4s -54° 31' 11" Centaurus bipolar nebula PN G340.3-03.2 Water Lily Nebula 17h 03m 10.1s -47° 00' 27" PK 340-03 1 IRAS 17163-3907 Fried Egg Nebula 17h 19m 49.3s -39° 10' 37.9" Finder charts measure 20° (with 5° circle) and 5° (with 1° circle) and were made with Cartes du Ciel by Patrick Chevalley (http://www.ap-i.net/skychart) Images are DSS Images (blue plates, POSS II or SERCJ) and measure 30’ by 30’ (http://archive.stsci.edu/cgi- bin/dss_plate_finder) and STScI Images (Hubble Space Telescope) Downloaded from www.reinervogel.net version 12/2012 DSS images copyright notice: The Digitized Sky Survey was produced at the Space Telescope Science Institute under U.S. -
Stories from Physics Astronomy And
King’s Research Portal Link to publication record in King's Research Portal Citation for published version (APA): Brock, R. (2021). Stories from Physics Booklet 7: Astronomy and Space. Institute of Physics. Citing this paper Please note that where the full-text provided on King's Research Portal is the Author Accepted Manuscript or Post-Print version this may differ from the final Published version. If citing, it is advised that you check and use the publisher's definitive version for pagination, volume/issue, and date of publication details. And where the final published version is provided on the Research Portal, if citing you are again advised to check the publisher's website for any subsequent corrections. General rights Copyright and moral rights for the publications made accessible in the Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognize and abide by the legal requirements associated with these rights. •Users may download and print one copy of any publication from the Research Portal for the purpose of private study or research. •You may not further distribute the material or use it for any profit-making activity or commercial gain •You may freely distribute the URL identifying the publication in the Research Portal Take down policy If you believe that this document breaches copyright please contact [email protected] providing details, and we will remove access to the work immediately and investigate your claim. Download date: 01. Oct. 2021 IOP Education |Stories from physics booklet 7 Astronomy and space By Richard Brock iop.org Stories from physics Stories from physics Introduction Message from the author Perhaps of all the topics on the school physics curriculum, space most readily This is the seventh book in our series. -
A Catalogue of Zeldovich Pancakes
A Catalogue of Zeldovich Pancakes Mikkel O. Lindholmer Supervisor: Steen H. Hansen Master’s thesis, submitted on October 18, 2015 Dark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, 2100 Copenhagen, Denmark Abstract Using the standard cold dark matter model ΛCDM, it is predicted that there will be small fluctuations in the primordial energy density. These fluctuations are expected to lead to a cosmic web [1] under the influence of gravity and time. This web will consist of dense galaxy clusters interlinked by less dense two-dimensional walls, so called Zeldovich pancakes [2], and one-dimensional filaments. Galaxy clusters and filaments have been observed for a long time, but only recently have Zeldovich pancakes been observed outside of simulations [6]. The reason these have only recently been observed is because they are much less dense than filaments and clusters, to the point of being hard to differentiate from the average density of their environs [4,5]. Using the method we invented in Falco et. al [6] to find 2 pancakes as a basis, I create a fully automatic program capable of finding pancakes without human input, in galaxy cluster widely different from each other. I apply this program to the Abell galaxy clusters and using the SDSS catalogue I check for potential pancakes in the galaxy clusters. While most of the cluster are contained in the SDSS many of the clusters are only partially covered. I try to make the program compensate for this and manage to create the first catalogue of Zeldovich pancakes by finding 197 of them in 113 different clusters. -
Issue 64, 2016
1 Director’s Message 45 On the Horizon Markus Kissler-Patig Gemini sta! contributions 3 Gemini South Explores the 55 A Transition Comes to an End Growth of Massive Galaxy Clusters Inger Jørgensen Sarah Sweet, Rodrigo Carrasco, and 59 Gemini Harnesses the Sun from Fernanda Urrutia Both Hemispheres 7 A Gemini Spectrum of a World Alexis Ann Acohido Colder than a Night on Maunakea Gemini Connections Andy Skemer 61 Peter Michaud 11 A Case of Warped Space: Confirming Strong Gravitational 64 A New Look for Gemini’s Legacy Lenses Found in the Dark Energy Images Survey 66 Observatory Careers: New Brian Nord and Elizabeth Buckley-Geer Resources for Students, Teachers, and Parents 16 Dusting the Universe with Supernovae 68 Journey Through the Universe: Jennifer Andrews Twelve Years, and Counting! Alexis-Ann Acohido 20 Science Highlights Gemini sta! contributions 71 Viaje al Universo 2016: Empowering Students with Science News for Users 31 Maunel Paredes Gemini sta! contributions ON THE COVER: GeminiFocus Color composite image January 2017 / 2016 Year in Review of the galaxy cluster GeminiFocus is a quarterly publication SPT-CL J0546-5345, of the Gemini Observatory comprised of Gemini 670 N. A‘ohoku Place, Hilo, Hawai‘i 96720, USA GeMS/GSAOI and HST Phone: (808) 974-2500 Fax: (808) 974-2589 data. White inset at right bottom shows Online viewing address: www.gemini.edu/geminifocus Gemini Ks image of the region. The article on Managing Editor: Peter Michaud this work begins on Associate Editor: Stephen James O’Meara page 3. Also shown Designer: Eve Furchgott/Blue Heron Multimedia are the covers from Any opinions, findings, and conclusions or April, July, and October recommendations expressed in this material are those of issues of GeminiFocus.