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Ray Emission from the Globular Cluster 47 Tucanae (Research Note)
A&A 499, 273–277 (2009) Astronomy DOI: 10.1051/0004-6361/200811564 & c ESO 2009 Astrophysics HESS upper limit on the very high energy γ-ray emission from the globular cluster 47 Tucanae (Research Note) F. Aharonian1,2, A. G. Akhperjanian3,G.Anton4, U. Barres de Almeida5,, A. R. Bazer-Bachi6, Y. Becherini7, B. Behera8, K. Bernlöhr1,9, C. Boisson10, A. Bochow1, V. Borrel6,I.Braun1,E.Brion11, J. Brucker4,P.Brun11, R. Bühler1,T.Bulik12, I. Büsching13, T. Boutelier14,P.M.Chadwick5, A. Charbonnier15,R.C.G.Chaves1, A. Cheesebrough5, L.-M. Chounet16,A.C.Clapson1, G. Coignet17, M. Dalton9,M.K.Daniel5,I.D.Davids18,13, B. Degrange16,C.Deil1, H. J. Dickinson5, A. Djannati-Ataï7, W. Domainko1, L. O’C. Drury2, F. Dubois17, G. Dubus14, J. Dyks12, M. Dyrda19,K.Egberts1, D. Emmanoulopoulos8, P. Espigat7, C. Farnier20, F. Feinstein20, A. Fiasson20, A. Förster1, G. Fontaine16,M.Füßling9,S.Gabici2,Y.A.Gallant20,L.Gérard7, B. Giebels16, J. F. Glicenstein11, B. Glück4,P.Goret11, D. Hauser8, M. Hauser8,S.Heinz4, G. Heinzelmann21,G.Henri14,G.Hermann1,J.A.Hinton22, A. Hoffmann23, W. Hofmann1, M. Holleran13, S. Hoppe1,D.Horns21, A. Jacholkowska15, O. C. de Jager13, I. Jung4, K. Katarzynski´ 24,U.Katz4, S. Kaufmann8, E. Kendziorra23, M. Kerschhaggl9, D. Khangulyan1, B. Khélifi16,D. Keogh5,Nu.Komin11, K. Kosack1,G.Lamanna17,J.-P.Lenain10, T. Lohse9, V. Marandon7, J. M. Martin10, O. Martineau-Huynh15 , A. Marcowith20, D. Maurin15,T.J.L.McComb5,M.C.Medina10, R. Moderski12, E. Moulin11, M. Naumann-Godo16, M. de Naurois15, D. Nedbal25, D. -
Dorado & Bedout Sub-Basin Update
Dorado & Bedout Sub-basin update 1 December 2020 Carnarvon Petroleum Limited (“Carnarvon” or “the Company”) is pleased to advise that its partner in the Dorado field development and Bedout sub-basin exploration permits has today provided the ASX with an update on the project. The material is available on the Santos website as part of their Investor Day presentation. The Dorado field is an important development in the Australia energy landscape with exciting upside potential in the surrounding exploration acreage that Carnarvon holds an interest in. At Carnarvon’s recent Annual General Meeting the Company made a number of key points on this project which have been reiterated by its partner today. These highlights include: • The Bedout sub-basin is a highly prospective, liquids rich region with very large volume potential; • A substantial amount of work is being undertaken in advancing the Dorado field development; • The initial Dorado liquids development is expected to deliver low cost production from late 2025; • A phased and disciplined development is planned to ensure optimised FPSO and infrastructure design is capable of realising the value potential from the discovered Dorado resource and importantly a number of nearby exploration targets; and • The material Pavo and Apus prospects, which are capable of being tied back to Dorado, are being advanced for drilling to commence in late 2021. Carnarvon holds interests in four exploration permits covering a substantial portion of the Bedout sub-basin. These interests include 20% in WA-435-P -
Adrienne M. Cool CURRICULUM VITAE Department
Adrienne M. Cool CURRICULUM VITAE Department of Physics and Astronomy San Francisco State University Tel: (415)338-6450 1600 Holloway Avenue Fax: (415)338-2178 San Francisco, CA 94132 E-mail: [email protected] Education Ph.D. Astronomy, Harvard University (1994) M.S. Electrical Engineering, Columbia University (1986) B.S. Physics, Yale University (1984) Employment 2006–present Professor, Department of Physics and Astronomy San Francisco State University 2000–06 Associate Professor, Department of Physics and Astronomy San Francisco State University 1996–00 Assistant Professor, Department of Physics and Astronomy San Francisco State University 1993–96 Postdoctoral Researcher, Department of Astronomy University of California, Berkeley 1988–93 Research Assistant, Department of Astronomy Harvard University 1988–90 Teaching Assistant, Department of Astronomy Harvard University 1987 Research Assistant, Astrophysics Laboratory Columbia University 1986 Teaching Assistant, Department of Electrical Engineering Columbia University 1985 Research Assistant, Department of Electrical Engineering Columbia University 1984 Private instructor in mathematics and physics 1981–84 Technical Assistant, Department of Nuclear Medicine Mount Sinai Medical Center, New York City Honors and Awards • Image of globular star cluster Omega Centauri chosen for Hubble Heritage web site (2008) • Affirmative Action Award, San Francisco State University (2005) • Image of globular star cluster NGC 6397 chosen for Hubble Heritage web site (2003) • Presidential Award for Professional Development of Probationary Faculty, San Francisco State University (2000) 1 • Outstanding Contributions to Teaching Certificate, San Francisco State University (1997) • Fellow, NASA Graduate Student Researchers Program (1992-93) • Harvard Merit Fellowship (1990) • Danforth Center Certificate for Teaching Excellence, Harvard University (1989) • Amelia Earhart Fellowship Award, Zonta International Foundation (1989, 1990) • Teaching Assistant/Scholar Award, Columbia University, Dept. -
Instruction Manual
1 Contents 1. Constellation Watch Cosmo Sign.................................................. 4 2. Constellation Display of Entire Sky at 35° North Latitude ........ 5 3. Features ........................................................................................... 6 4. Setting the Time and Constellation Dial....................................... 8 5. Concerning the Constellation Dial Display ................................ 11 6. Abbreviations of Constellations and their Full Spellings.......... 12 7. Nebulae and Star Clusters on the Constellation Dial in Light Green.... 15 8. Diagram of the Constellation Dial............................................... 16 9. Precautions .................................................................................... 18 10. Specifications................................................................................. 24 3 1. Constellation Watch Cosmo Sign 2. Constellation Display of Entire Sky at 35° The Constellation Watch Cosmo Sign is a precisely designed analog quartz watch that North Latitude displays not only the current time but also the correct positions of the constellations as Right ascension scale Ecliptic Celestial equator they move across the celestial sphere. The Cosmo Sign Constellation Watch gives the Date scale -18° horizontal D azimuth and altitude of the major fixed stars, nebulae and star clusters, displays local i c r e o Constellation dial setting c n t s ( sidereal time, stellar spectral type, pole star hour angle, the hours for astronomical i o N t e n o l l r f -
Naming the Extrasolar Planets
Naming the extrasolar planets W. Lyra Max Planck Institute for Astronomy, K¨onigstuhl 17, 69177, Heidelberg, Germany [email protected] Abstract and OGLE-TR-182 b, which does not help educators convey the message that these planets are quite similar to Jupiter. Extrasolar planets are not named and are referred to only In stark contrast, the sentence“planet Apollo is a gas giant by their assigned scientific designation. The reason given like Jupiter” is heavily - yet invisibly - coated with Coper- by the IAU to not name the planets is that it is consid- nicanism. ered impractical as planets are expected to be common. I One reason given by the IAU for not considering naming advance some reasons as to why this logic is flawed, and sug- the extrasolar planets is that it is a task deemed impractical. gest names for the 403 extrasolar planet candidates known One source is quoted as having said “if planets are found to as of Oct 2009. The names follow a scheme of association occur very frequently in the Universe, a system of individual with the constellation that the host star pertains to, and names for planets might well rapidly be found equally im- therefore are mostly drawn from Roman-Greek mythology. practicable as it is for stars, as planet discoveries progress.” Other mythologies may also be used given that a suitable 1. This leads to a second argument. It is indeed impractical association is established. to name all stars. But some stars are named nonetheless. In fact, all other classes of astronomical bodies are named. -
Luminosity - Wikipedia
12/2/2018 Luminosity - Wikipedia Luminosity In astronomy, luminosity is the total amount of energy emitted by a star, galaxy, or other astronomical object per unit time.[1] It is related to the brightness, which is the luminosity of an object in a given spectral region.[1] In SI units luminosity is measured in joules per second or watts. Values for luminosity are often given in the terms of the luminosity of the Sun, L⊙. Luminosity can also be given in terms of magnitude: the absolute bolometric magnitude (Mbol) of an object is a logarithmic measure of its total energy emission rate. Contents Measuring luminosity Stellar luminosity Image of galaxy NGC 4945 showing Radio luminosity the huge luminosity of the central few star clusters, suggesting there is an Magnitude AGN located in the center of the Luminosity formulae galaxy. Magnitude formulae See also References Further reading External links Measuring luminosity In astronomy, luminosity is the amount of electromagnetic energy a body radiates per unit of time.[2] When not qualified, the term "luminosity" means bolometric luminosity, which is measured either in the SI units, watts, or in terms of solar luminosities (L☉). A bolometer is the instrument used to measure radiant energy over a wide band by absorption and measurement of heating. A star also radiates neutrinos, which carry off some energy (about 2% in the case of our Sun), contributing to the star's total luminosity.[3] The IAU has defined a nominal solar luminosity of 3.828 × 102 6 W to promote publication of consistent and comparable values in units of https://en.wikipedia.org/wiki/Luminosity 1/9 12/2/2018 Luminosity - Wikipedia the solar luminosity.[4] While bolometers do exist, they cannot be used to measure even the apparent brightness of a star because they are insufficiently sensitive across the electromagnetic spectrum and because most wavelengths do not reach the surface of the Earth. -
The Lore of the Stars, for Amateur Campfire Sages
obscure. Various claims have been made about Babylonian innovations and the similarity between the Greek zodiac and the stories, dating from the third millennium BCE, of Gilgamesh, a legendary Sumerian hero who encountered animals and characters similar to those of the zodiac. Some of the Babylonian constellations may have been popularized in the Greek world through the conquest of The Lore of the Stars, Alexander in the fourth century BCE. Alexander himself sent captured Babylonian texts back For Amateur Campfire Sages to Greece for his tutor Aristotle to interpret. Even earlier than this, Babylonian astronomy by Anders Hove would have been familiar to the Persians, who July 2002 occupied Greece several centuries before Alexander’s day. Although we may properly credit the Greeks with completing the Babylonian work, it is clear that the Babylonians did develop some of the symbols and constellations later adopted by the Greeks for their zodiac. Contrary to the story of the star-counter in Le Petit Prince, there aren’t unnumerable stars Cuneiform tablets using symbols similar to in the night sky, at least so far as we can see those used later for constellations may have with our own eyes. Only about a thousand are some relationship to astronomy, or they may visible. Almost all have names or Greek letter not. Far more tantalizing are the various designations as part of constellations that any- cuneiform tablets outlining astronomical one can learn to recognize. observations used by the Babylonians for Modern astronomers have divided the sky tracking the moon and developing a calendar. into 88 constellations, many of them fictitious— One of these is the MUL.APIN, which describes that is, they cover sky area, but contain no vis- the stars along the paths of the moon and ible stars. -
The Stellar Group NGC 1901 in Front of the Large Magellanic Cloud ,
A&A 466, 931–941 (2007) Astronomy DOI: 10.1051/0004-6361:20066687 & c ESO 2007 Astrophysics Observational templates of star cluster disruption The stellar group NGC 1901 in front of the Large Magellanic Cloud, G. Carraro1,2, R. de la Fuente Marcos3, S. Villanova1, C. Moni Bidin2, C. de la Fuente Marcos3,H.Baumgardt4, and G. Solivella5 1 Dipartimento di Astronomia, Università di Padova, Vicolo Osservatorio 2, 35122 Padova, Italy e-mail: [email protected] 2 Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile 3 Suffolk University Madrid Campus, C/ Viña 3, 28003 Madrid, Spain 4 AIfA, University of Bonn, Auf dem Hügel 71, 53121 Bonn, Germany 5 Facultad de Ciencias Astronómicas y Geofísicas de la UNLP, IALP-CONICET, Paseo del Bosque s/n, La Plata, Argentina Received 3 November 2006 / Accepted 23 January 2007 ABSTRACT Context. Observations indicate that present-day star formation in the Milky Way disk takes place in stellar ensembles or clusters rather than in isolation. Bound, long-lived stellar groups are known as open clusters. They gradually lose stars and are severely disrupted in their final evolutionary stages, leaving an open cluster remnant made up of a few stars. Aims. In this paper, we study in detail the stellar content and kinematics of the poorly populated star cluster NGC 1901. This object appears projected against the Large Magellanic Cloud. The aim of the present work is to derive the current evolutionary status, binary fraction, age, and mass of this stellar group. These are fundamental quantities to compare with those from N-body models in order to study the most general topic of star cluster evolution and dissolution. -
On the Effects of Subvirial Initial Conditions and the Birth
Mon. Not. R. Astron. Soc. 000, 000–000 (0000) Printed 24 October 2018 (MN LATEX style file v2.2) On the Effects of Subvirial Initial Conditions and the Birth Temperature of R136 Daniel P. Caputo1⋆, Nathan de Vries1 and Simon Portegies Zwart1 1Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, the Netherlands 24 October 2018 ABSTRACT We investigate the effect of different initial virial temperatures, Q, on the dynamics of star clusters. We find that the virial temperature has a strong effect on many aspects of the resulting system, including among others: the fraction of bodies escaping from the system, the depth of the collapse of the system, and the strength of the mass segregation. These differences deem the practice of using “cold” initial conditions no longer a simple choice of convenience. The choice of initial virial temperature must be carefully considered as its impact on the remainder of the simulation can be profound. We discuss the pitfalls and aim to describe the general behavior of the collapse and the resultant system as a function of the virial temperature so that a well reasoned choice of initial virial temperature can be made. We make a correction to the previous theoretical estimate for the minimum radius, Rmin, of the cluster at the deepest (−1/3) moment of collapse to include a Q dependency, Rmin ≈ Q+N , where N is the number of particles. We use our numericalresults to infer more aboutthe initial conditions of the young cluster R136. Based on our analysis, we find that R136 was likely formed with a rather cool, but not cold, initial virial temperature (Q ≈ 0.13). -
Report of Contributions
Mapping the X-ray Sky with SRG: First Results from eROSITA and ART-XC Report of Contributions https://events.mpe.mpg.de/e/SRG2020 Mapping the X- … / Report of Contributions eROSITA discovery of a new AGN … Contribution ID : 4 Type : Oral Presentation eROSITA discovery of a new AGN state in 1H0707-495 Tuesday, 17 March 2020 17:45 (15) One of the most prominent AGNs, the ultrasoft Narrow-Line Seyfert 1 Galaxy 1H0707-495, has been observed with eROSITA as one of the first CAL/PV observations on October 13, 2019 for about 60.000 seconds. 1H 0707-495 is a highly variable AGN, with a complex, steep X-ray spectrum, which has been the subject of intense study with XMM-Newton in the past. 1H0707-495 entered an historical low hard flux state, first detected with eROSITA, never seen before in the 20 years of XMM-Newton observations. In addition ultra-soft emission with a variability factor of about 100 has been detected for the first time in the eROSITA light curves. We discuss fast spectral transitions between the cool and a hot phase of the accretion flow in the very strong GR regime as a physical model for 1H0707-495, and provide tests on previously discussed models. Presenter status Senior eROSITA consortium member Primary author(s) : Prof. BOLLER, Thomas (MPE); Prof. NANDRA, Kirpal (MPE Garching); Dr LIU, Teng (MPE Garching); MERLONI, Andrea; Dr DAUSER, Thomas (FAU Nürnberg); Dr RAU, Arne (MPE Garching); Dr BUCHNER, Johannes (MPE); Dr FREYBERG, Michael (MPE) Presenter(s) : Prof. BOLLER, Thomas (MPE) Session Classification : AGN physics, variability, clustering October 3, 2021 Page 1 Mapping the X- … / Report of Contributions X-ray emission from warm-hot int … Contribution ID : 9 Type : Poster X-ray emission from warm-hot intergalactic medium: the role of resonantly scattered cosmic X-ray background We revisit calculations of the X-ray emission from warm-hot intergalactic medium (WHIM) with particular focus on contribution from the resonantly scattered cosmic X-ray background (CXB). -
THE MAGELLANIC CLOUDS NEWSLETTER an Electronic Publication Dedicated to the Magellanic Clouds, and Astrophysical Phenomena Therein
THE MAGELLANIC CLOUDS NEWSLETTER An electronic publication dedicated to the Magellanic Clouds, and astrophysical phenomena therein No. 135 — 1 June 2015 http://www.astro.keele.ac.uk/MCnews Editor: Jacco van Loon Editorial Dear Colleagues, It is my pleasure to present you the 135th issue of the Magellanic Clouds Newsletter. From magnetism and galactic structure and interaction, to variable, massive, (post-)AGB and exploding stars, and more on star cluster content – there’s something for everyone. Hope to see you at the IAU General Assembly in August, or in Baltimore in October! The next issue is planned to be distributed on the 1st of August. Editorially Yours, Jacco van Loon 1 Refereed Journal Papers Photometric identification of the periods of the first candidate extragalactic magnetic stars Ya¨el Naz´e1, Nolan R Walborn2, Nidia Morrell3, Gregg A Wade4 and MichaÃl K. Szyma´nski5 1University of LI`ege, Belgium 2STScI, USA 3Las Campanas Observatory, Chile 4Royal Military College, USA 5Warsaw University, Poland Galactic stars belonging to the Of?p category are all strongly magnetic objects exhibiting rotationally modulated spectral and photometric changes on timescales of weeks to years. Five candidate Of?p stars in the Magellanic Clouds have been discovered, notably in the context of ongoing surveys of their massive star populations. Here we describe an investigation of their photometric behaviour, revealing significant variability in all studied objects on timescales of one week to more than four years, including clearly periodic variations for three of them. Their spectral characteristics along with these photometric changes provide further support for the hypothesis that these are strongly magnetized O stars, analogous to the Of?p stars in the Galaxy. -
Educator's Guide: Orion
Legends of the Night Sky Orion Educator’s Guide Grades K - 8 Written By: Dr. Phil Wymer, Ph.D. & Art Klinger Legends of the Night Sky: Orion Educator’s Guide Table of Contents Introduction………………………………………………………………....3 Constellations; General Overview……………………………………..4 Orion…………………………………………………………………………..22 Scorpius……………………………………………………………………….36 Canis Major…………………………………………………………………..45 Canis Minor…………………………………………………………………..52 Lesson Plans………………………………………………………………….56 Coloring Book…………………………………………………………………….….57 Hand Angles……………………………………………………………………….…64 Constellation Research..…………………………………………………….……71 When and Where to View Orion…………………………………….……..…77 Angles For Locating Orion..…………………………………………...……….78 Overhead Projector Punch Out of Orion……………………………………82 Where on Earth is: Thrace, Lemnos, and Crete?.............................83 Appendix………………………………………………………………………86 Copyright©2003, Audio Visual Imagineering, Inc. 2 Legends of the Night Sky: Orion Educator’s Guide Introduction It is our belief that “Legends of the Night sky: Orion” is the best multi-grade (K – 8), multi-disciplinary education package on the market today. It consists of a humorous 24-minute show and educator’s package. The Orion Educator’s Guide is designed for Planetarians, Teachers, and parents. The information is researched, organized, and laid out so that the educator need not spend hours coming up with lesson plans or labs. This has already been accomplished by certified educators. The guide is written to alleviate the fear of space and the night sky (that many elementary and middle school teachers have) when it comes to that section of the science lesson plan. It is an excellent tool that allows the parents to be a part of the learning experience. The guide is devised in such a way that there are plenty of visuals to assist the educator and student in finding the Winter constellations.