Curriculum Vitae
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A Dozen Colliding Wind X-Ray Binaries in the Star Cluster R 136 in the 30 Doradus Region
A dozen colliding wind X-ray binaries in the star cluster R 136 in the 30 Doradus region Simon F. Portegies Zwart?,DavidPooley,Walter,H.G.Lewin Massachusetts Institute of Technology, Cambridge, MA 02139, USA ? Hubble Fellow Subject headings: stars: early-type — tars: Wolf-Rayet — galaxies:) Magellanic Clouds — X-rays: stars — X-rays: binaries — globular clusters: individual (R136) –2– ABSTRACT We analyzed archival Chandra X-ray observations of the central portion of the 30 Doradus region in the Large Magellanic Cloud. The image contains 20 32 35 1 X-ray point sources with luminosities between 5 10 and 2 10 erg s− (0.2 × × — 3.5 keV). A dozen sources have bright WN Wolf-Rayet or spectral type O stars as optical counterparts. Nine of these are within 3:4 pc of R 136, the ∼ central star cluster of NGC 2070. We derive an empirical relation between the X-ray luminosity and the parameters for the stellar wind of the optical counterpart. The relation gives good agreement for known colliding wind binaries in the Milky Way Galaxy and for the identified X-ray sources in NGC 2070. We conclude that probably all identified X-ray sources in NGC 2070 are colliding wind binaries and that they are not associated with compact objects. This conclusion contradicts Wang (1995) who argued, using ROSAT data, that two earlier discovered X-ray sources are accreting black-hole binaries. Five early type stars in R 136 are not bright in X-rays, possibly indicating that they are either: single stars or have a low mass companion or a wide orbit. -
AAO of the FUTURE AAO of Next Generation Fibre Positioning Robots
IAU SPECIAL EDITION JULY 2003 NEWSLETTER ANGLO-AUSTRALIAN OBSERVATORY AAO OF THE FUTURE Next generation fibre positioning robots. Microrobotic technology based on the AAO’s Echidna system allows accurate positioning of payloads such as single fibres, guide bundles, mini- IFUs or even pick-off mirrors to be accurately positioned on large focal plates for large and ‘extremely large’ telescopes. See article on page 18. contents 3The Anglo-Australian Planet Search finDs a new “Solar System”-like gas giant (Chris Tinney et al.) 4RAVE hits the galaxy (FreD Watson et al.) 8A search for the highest reDshift raDio galaxies (Carlos De Breuck et al.) 9The 6DF Galaxy Survey (Will SaunDers et al.) 14 The end of observations for the 2dF Galaxy Redshift Survey (Matthew Colless et al.) 18 Directions for future instrumentation Development by the AAO (AnDrew McGrath et al.) 20 AAΩ: the successor to 2dF (Terry Bridges et al.) DIRECTOR’S MESSAGE DIRECTOR’S DIRECTOR’S MESSAGE On behalf of the staff of the Anglo-Australian Observatory, I would like to extend a warm welcome to Sydney to all IAU General Assembly delegates. This special GA edition of the AAO newsletter showcases some of the AAO’s achievements over the past year as well as some exciting new directions in which the AAO is heading in the future. Over the past few years the AAO has increasingly sought to build on its scientific and technical expertise through the design and building of astronomical instrumentation for overseas observatories, whilst maintaining its own telescopes as world-class facilities. The success of science programs such as the Anglo-Australian Planet Search and the 2dF Galaxy Redshift Survey amply demonstrate that the AAO is still facilitating the production of outstanding science by its user communities. -
Giant H II Regions in the Merging System NGC 3256: Are They the Birthplaces of Globular Clusters?
CORE Metadata, citation and similar papers at core.ac.uk Provided by CERN Document Server Paper I: To be submitted to A.J. Giant H II regions in the merging system NGC 3256: Are they the birthplaces of globular clusters? J. English University of Manitoba K.C. Freeman Research School of Astronomy and Astrophysics, The Australian National University ABSTRACT CCD images and spectra of ionized hydrogen in the merging system NGC3256 were acquired as part of a kinematic study to investigate the formation of globular clusters (GC) during the interactions and mergers of disk galaxies. This paper focuses on the proposition by Kennicutt & Chu (1988) that giant H II regions, with an Hα luminosity > 1:5 1040 erg s 1, are birthplaces of young populous clusters (YPC’s ). × − Although NGC 3256 has relatively few (7) giant H II complexes, compared to some other interacting systems, these regions are comparable in total flux to about 85 30- Doradus-like H II regions (30-Dor GHR’s). The bluest, massive YPC’s (Zepf et al. 1999) are located in the vicinity of observed 30-Dor GHR’s, contributing to the notion that some fraction of 30-Dor GHR’s do cradle massive YPC’s, as 30 Dor harbors R136. If interactions induce the formation of 30-Dor GHR’s, the observed luminosities indi- cate that almost 900 30-Dor GHR’s would form in NGC 3256 throughout its merger epoch. In order for 30-Dor GHR’s to be considered GC progenitors, this number must be consistent with the specific frequencies of globular clusters estimated for elliptical galaxies formed via mergers of spirals (Ashman & Zepf 1993). -
Arxiv:2009.04090V2 [Astro-Ph.GA] 14 Sep 2020
Research in Astronomy and Astrophysics manuscript no. (LATEX: tikhonov˙Dorado.tex; printed on September 15, 2020; 1:01) Distance to the Dorado galaxy group N.A. Tikhonov1, O.A. Galazutdinova1 Special Astrophysical Observatory, Nizhnij Arkhyz, Karachai-Cherkessian Republic, Russia 369167; [email protected] Abstract Based on the archival images of the Hubble Space Telescope, stellar photometry of the brightest galaxies of the Dorado group:NGC 1433, NGC1533,NGC1566and NGC1672 was carried out. Red giants were found on the obtained CM diagrams and distances to the galaxies were measured using the TRGB method. The obtained values: 14.2±1.2, 15.1±0.9, 14.9 ± 1.0 and 15.9 ± 0.9 Mpc, show that all the named galaxies are located approximately at the same distances and form a scattered group with an average distance D = 15.0 Mpc. It was found that blue and red supergiants are visible in the hydrogen arm between the galaxies NGC1533 and IC2038, and form a ring structure in the lenticular galaxy NGC1533, at a distance of 3.6 kpc from the center. The high metallicity of these stars (Z = 0.02) indicates their origin from NGC1533 gas. Key words: groups of galaxies, Dorado group, stellar photometry of galaxies: TRGB- method, distances to galaxies, galaxies NGC1433, NGC 1533, NGC1566, NGC1672 1 INTRODUCTION arXiv:2009.04090v2 [astro-ph.GA] 14 Sep 2020 A concentration of galaxies of different types and luminosities can be observed in the southern constella- tion Dorado. Among them, Shobbrook (1966) identified 11 galaxies, which, in his opinion, constituted one group, which he called “Dorado”. -
Professor Peter Goldreich Member of the Board of Adjudicators Chairman of the Selection Committee for the Prize in Astronomy
The Shaw Prize The Shaw Prize is an international award to honour individuals who are currently active in their respective fields and who have recently achieved distinguished and significant advances, who have made outstanding contributions in academic and scientific research or applications, or who in other domains have achieved excellence. The award is dedicated to furthering societal progress, enhancing quality of life, and enriching humanity’s spiritual civilization. Preference is to be given to individuals whose significant work was recently achieved and who are currently active in their respective fields. Founder's Biographical Note The Shaw Prize was established under the auspices of Mr Run Run Shaw. Mr Shaw, born in China in 1907, was a native of Ningbo County, Zhejiang Province. He joined his brother’s film company in China in the 1920s. During the 1950s he founded the film company Shaw Brothers (HK) Limited in Hong Kong. He was one of the founding members of Television Broadcasts Limited launched in Hong Kong in 1967. Mr Shaw also founded two charities, The Shaw Foundation Hong Kong and The Sir Run Run Shaw Charitable Trust, both dedicated to the promotion of education, scientific and technological research, medical and welfare services, and culture and the arts. ~ 1 ~ Message from the Chief Executive I warmly congratulate the six Shaw Laureates of 2014. Established in 2002 under the auspices of Mr Run Run Shaw, the Shaw Prize is a highly prestigious recognition of the role that scientists play in shaping the development of a modern world. Since the first award in 2004, 54 leading international scientists have been honoured for their ground-breaking discoveries which have expanded the frontiers of human knowledge and made significant contributions to humankind. -
The Wigglez Dark Energy Survey: Probing the Epoch of Radiation Domination Using Large-Scale Structure
MNRAS 429, 1902–1912 (2013) doi:10.1093/mnras/sts431 The WiggleZ Dark Energy Survey: probing the epoch of radiation domination using large-scale structure Gregory B. Poole,1,2‹ Chris Blake,1 David Parkinson,3 Sarah Brough,4 Matthew Colless,4 Carlos Contreras,1 Warrick Couch,1 Darren J. Croton,1 Scott Croom,5 Tamara Davis,3 Michael J. Drinkwater,3 Karl Forster,6 David Gilbank,7 Mike Gladders,8 Karl Glazebrook,1 Ben Jelliffe,5 Russell J. Jurek,9 I-hui Li,10 Barry Madore,11 D. Christopher Martin,6 Kevin Pimbblet,12 Michael Pracy,1,13 4,13 1,14 15 Rob Sharp, Emily Wisnioski, David Woods, Downloaded from Ted K. Wyder6 and H. K. C. Yee10 1Centre for Astrophysics & Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, VIC 3122, Australia 2School of Physics, University of Melbourne, Parksville, VIC 3010, Australia 3School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, Australia 4Australian Astronomical Observatory, PO Box 915, North Ryde, NSW 1670, Australia http://mnras.oxfordjournals.org/ 5Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia 6California Institute of Technology, MC 278-17, 1200 East California Boulevard, Pasadena, CA 91125, USA 7South African Astronomical Observatory, PO Box 9, 7935 Observatory, Cape Town, South Africa 8Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA 9Australia Telescope National Facility, CSIRO, Epping, NSW 1710, Australia 10Department of Astronomy and Astrophysics, -
The Wigglez Dark Energy Survey
The WiggleZ Dark Energy Survey Chris Blake (Swinburne University) Sarah Brough, Warrick Couch, Karl Glazebrook, Greg Poole (Swinburne University); Tamara Davis, Michael Drinkwater, Russell Jurek, Kevin Pimbblet (Uni. of Queensland); Matthew Colless, Rob Sharp (Anglo-Australian Observatory); Scott Croom (University of Sydney); Michael Pracy (Australian National University); David Woods (University of New South Wales); Barry Madore (OCIW); Chris Martin, Ted Wyder (Caltech) Abstract: The accelerating expansion rate of the Universe, attributed to “dark energy”, has no accepted theoretical explanation. The origin of this phenomenon unambiguously implicates new physics via a novel form of matter exerting neg- ative pressure or an alteration to Einstein’s General Relativity. These profound consequences have inspired a new generation of cosmological surveys which will measure the influence of dark energy using various techniques. One of the forerun- ners is the WiggleZ Survey at the Anglo-Australian Telescope, a new large-scale high-redshift galaxy survey which is now 50% complete and scheduled to finish in 2010. The WiggleZ project is aiming to map the cosmic expansion history using delicate features in the galaxy clustering pattern imprinted 13.7 billion years ago. In this article we outline the survey design and context, and predict the likely science highlights. Figure 1: Caption: The distribution of galaxies currently observed in the three WiggleZ Survey fields located near the Northern Galactic Pole. The observer is situated at the origin of the co-ordinate system. The radial distance of each galaxy from the origin indicates the observed redshift, and the polar angle indicates the galaxy right ascension. The faint patterns of galaxy clustering are visible in each field. -
The H-Index in Australian Astronomy
Addenda: The h-index in Australian Astronomy Kevin A. PimbbletA,B A School of Physics, Monash University, Clayton, VIC 3800, Australia B Email: [email protected] Abstract: Pimbblet (2011) published an evaluation of the Hirsch h-index in the context of the Aus- tralian astronomical community. This addenda adds treatment of changes of surname to the compu- tation of the h-index and presents derivative data on the m-index. Keywords: Errata, Addenda 1 Change of Surname Table 1: Top 10 h-index for Australian Astron- Pimbblet (2011) published a variety of analyses on the omy, excluding overseas professionals with correc- h-index (e.g. Hirsch 2005) in the context of Australian tion applied for surname changes. Astronomy. Alongside that, a discussion of a number Rank Name h of caveats was also made. One further caveat merits =1 KenFREEMAN 77 explicit attention in the interpretation of the h-index: =1 JeremyMOULD 77 changes of surname. In the Pimbblet (2011) analysis, 3 Karl GLAZEBROOK 71 no attempt was made to track surname changes. This 4 Dick MANCHESTER 68 has the effect of depressing the h-index of individuals 5 MichaelDOPITA 64 who have changed their names over the years. Its effect can readily be seen in Table 1 where we re-compute the 6 Warrick COUCH 61 top ten h-index for Australian Astronomy and account 7 Joss BLAND-HAWTHORN 57 for changing surnames: Bland-Hawthorn’s previous h- 8 MatthewCOLLESS 56 index was suppressed by 4 points by not taking this in 9 Brian SCHMIDT 54 to account. We emphasize that the same dataset was 10 MikeBESSELL 53 used for this re-computation as the original paper. -
Download the 2016 Spring Deep-Sky Challenge
Deep-sky Challenge 2016 Spring Southern Star Party Explore the Local Group Bonnievale, South Africa Hello! And thanks for taking up the challenge at this SSP! The theme for this Challenge is Galaxies of the Local Group. I’ve written up some notes about galaxies & galaxy clusters (pp 3 & 4 of this document). Johan Brink Peter Harvey Late-October is prime time for galaxy viewing, and you’ll be exploring the James Smith best the sky has to offer. All the objects are visible in binoculars, just make sure you’re properly dark adapted to get the best view. Galaxy viewing starts right after sunset, when the centre of our own Milky Way is visible low in the west. The edge of our spiral disk is draped along the horizon, from Carina in the south to Cygnus in the north. As the night progresses the action turns north- and east-ward as Orion rises, drawing the Milky Way up with it. Before daybreak, the Milky Way spans from Perseus and Auriga in the north to Crux in the South. Meanwhile, the Large and Small Magellanic Clouds are in pole position for observing. The SMC is perfectly placed at the start of the evening (it culminates at 21:00 on November 30), while the LMC rises throughout the course of the night. Many hundreds of deep-sky objects are on display in the two Clouds, so come prepared! Soon after nightfall, the rich galactic fields of Sculptor and Grus are in view. Gems like Caroline’s Galaxy (NGC 253), the Black-Bottomed Galaxy (NGC 247), the Sculptor Pinwheel (NGC 300), and the String of Pearls (NGC 55) are keen to be viewed. -
Finding the Radiation from the Big Bang
Finding The Radiation from the Big Bang P. J. E. Peebles and R. B. Partridge January 9, 2007 4. Preface 6. Chapter 1. Introduction 13. Chapter 2. A guide to cosmology 14. The expanding universe 19. The thermal cosmic microwave background radiation 21. What is the universe made of? 26. Chapter 3. Origins of the Cosmology of 1960 27. Nucleosynthesis in a hot big bang 32. Nucleosynthesis in alternative cosmologies 36. Thermal radiation from a bouncing universe 37. Detecting the cosmic microwave background radiation 44. Cosmology in 1960 52. Chapter 4. Cosmology in the 1960s 53. David Hogg: Early Low-Noise and Related Studies at Bell Lab- oratories, Holmdel, N.J. 57. Nick Woolf: Conversations with Dicke 59. George Field: Cyanogen and the CMBR 62. Pat Thaddeus 63. Don Osterbrock: The Helium Content of the Universe 70. Igor Novikov: Cosmology in the Soviet Union in the 1960s 78. Andrei Doroshkevich: Cosmology in the Sixties 1 80. Rashid Sunyaev 81. Arno Penzias: Encountering Cosmology 95. Bob Wilson: Two Astronomical Discoveries 114. Bernard F. Burke: Radio astronomy from first contacts to the CMBR 122. Kenneth C. Turner: Spreading the Word — or How the News Went From Princeton to Holmdel 123. Jim Peebles: How I Learned Physical Cosmology 136. David T. Wilkinson: Measuring the Cosmic Microwave Back- ground Radiation 144. Peter Roll: Recollections of the Second Measurement of the CMBR at Princeton University in 1965 153. Bob Wagoner: An Initial Impact of the CMBR on Nucleosyn- thesis in Big and Little Bangs 157. Martin Rees: Advances in Cosmology and Relativistic Astro- physics 163. -
Dorado and Its Member Galaxies II: a UVIT Picture of the NGC 1533 Substructure
J. Astrophys. Astr. (2021) 42:31 Ó Indian Academy of Sciences https://doi.org/10.1007/s12036-021-09690-xSadhana(0123456789().,-volV)FT3](0123456789().,-volV) SCIENCE RESULTS Dorado and its member galaxies II: A UVIT picture of the NGC 1533 substructure R. RAMPAZZO1,2,* , P. MAZZEI2, A. MARINO2, L. BIANCHI3, S. CIROI4, E. V. HELD2, E. IODICE5, J. POSTMA6, E. RYAN-WEBER7, M. SPAVONE5 and M. USLENGHI8 1INAF Osservatorio Astrofisico di Asiago, Via Osservatorio 8, 36012 Asiago, Italy. 2INAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padua, Italy. 3Department of Physics and Astronomy, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA. 4Department of Physics and Astronomy, University of Padova, Vicolo dell’Osservatorio 3, 35122 Padua, Italy. 5INAF-Osservatorio Astronomico di Capodimonte, Salita Moiariello 16, 80131 Naples, Italy. 6University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada. 7Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, VIC 3122, Australia. 8INAF-IASF, Via A. Curti, 12, 20133 Milan, Italy. *Corresponding Author. E-mail: [email protected] MS received 30 October 2020; accepted 17 December 2020 Abstract. Dorado is a nearby (17.69 Mpc) strongly evolving galaxy group in the Southern Hemisphere. We are investigating the star formation in this group. This paper provides a FUV imaging of NGC 1533, IC 2038 and IC 2039, which form a substructure, south west of the Dorado group barycentre. FUV CaF2-1 UVIT-Astrosat images enrich our knowledge of the system provided by GALEX. In conjunction with deep optical wide-field, narrow-band Ha and 21-cm radio images we search for signatures of the interaction mechanisms looking in the FUV morphologies and derive the star formation rate. -
Annual Review 2011/12
UCL DEPARTMENT OF PHYSICS AND ASTRONOMY PHYSICS AND ASTRONOMY 2011–12 ANNUAL REVIEW PHYSICS AND ASTRONOMY ANNUAL REVIEW 2011–12 Contents Welcome It is an honour to write this WELCOME 1 introduction standing, to misquote Newton, on the shoulders of giants. COMMUNITY FOCUS 3 Jonathan Tennyson finished his Teaching Lowdown 4 tenure as Head of Department in September 2011 and so the majority Student Accolades 4 of the material contained in this Outstanding PhD Theses Published 5 Review records achievements under his leadership. In addition, Tony Career Profiles 6 Harker is currently acting as Head of Science in Action 8 Department in many matters and will continue to do so until October 2012. Alumni Matters 9 This is due to my on-going commitments with the ATLAS experiment on the ACADEMIC SHOWCASE 11 Large Hadron Collider (LHC) at CERN. Staff Accolades 12 I currently spend a large amount of my time in Geneva and I am very grateful Academic Appointments 14 to both Tony and Jonathan, as well as to other members of staff for helping Doctor of Philosophy (PhD) 15 to make this transition a success. In Portrait of Dr Phil Jones 16 particular I would also like to thank Hilary Wigmore as Departmental Manager and Raman Prinja as the new Director of RESEARCH SPOTLIGHT 17 Teaching for their continued support. Atomic, Molecular, Optical and Position Physics (AMOPP) 19 High Energy Physics (HEP) 21 “Success in such long- Condensed Matter and term, high-impact projects Materials Physics (CMMP) 25 requires sustained vision Astrophysics (Astro) 29 and dedicated work by Biological Physics (BioP) 33 excellent scientists over Research Statistics 35 many years.” Staff Snapshot 38 Underpinning this success is the outstanding quality of scientific research and education within the Department.