DOCSLIB.ORG

Dark Matter Distribution in Dwarf Spheroidals

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Dark Matter Distribution in Dwarf Spheroidals Research Collection Doctoral Thesis Dark Matter Distribution in Dwarf Spheroidals Author(s): Steger, Pascal S.P. Publication Date: 2015 Permanent Link: https://doi.org/10.3929/ethz-a-010476521 Rights / License: In Copyright - Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library DARK MATTER Distribution in Dwarf Spheroidals PhD Thesis Pascal Stephan Philipp Steger March 2015 DISS. ETH NO. 22628 Dark Matter Distribution in Dwarf Spheroidals A thesis submitted to attain the degree of DOCTOR OF SCIENCES of ETH ZURICH (Dr. sc. ETH Zurich) presented by Pascal Stephan Philipp Steger MSc Physics ETH born on 04. 08. 1986 citizen of Emmen / Ettiswil LU, Switzerland accepted on the recommendation of Prof. Dr. Simon Lilly Prof. Dr. Justin I. Read Prof. Dr. Jorge Pe˜narrubia 2015 Acknowledgements I warmly thank Justin Read for the pleasant environment. You guided me around numer- ous obstacles, and showed me what science really is all about. You helped me with inputs for simplifications and generalisations, whenever they were sorely needed. And some cute integral transformations. You helped me personally by showing me what counts in life, and how adventurous ones dreams might be. I want to thank Simon Lilly for the hassle- free administrative takeover. Thank you for your patience and for enabling me to show my work at all the conferences, too. Frank Schweitzer, thank you for your succinct and energetic clarifications on the scientific method. It has been proven to be an invaluable guide to perform research. Thank you, Hamish Silverwood, for the effort to take over the disc geometry part of my mass-modelling code. Silvia Sivertsson is thanked for asking questions that led to the extinction of some bugs. And back to Hamish again: Thank you for your insights into New Zealand’s culture. It’s valued. I thank Matthew Walker for all the exquisite data and mock galaxies he provided for free. Thank you as well for the warm welcomes at all the conferences we met. Alexander Hobbs broadened my horizon on numerical astrophysics. Thank you for all the important lessons on CBM and strong frames, too. That is knowledge that will not be forgotten. Ouch. The precursor non-equilibrium chemistry simulation was performed by Aaron Boley, who gave useful technical hints as well. Silvia Garbari provided a prototype algorithm for the correction of the prospective halo centres. Might be simple, but makes all the difference when searching for cusps. A warm thank-you goes to Michael Mayer, who showed me all about teaching. Your policy of freedom for the exercise composition allowed me to express myself, but I never failed to know the boundaries, either. I had several discussions with Jorge Penarrubia on general topics of thermodynamics, dynamics, and physics itself. Thank you for the overview this gave me. Thank you as well for your down-to-earth hints for code opti- misation. Thank you, Vincent Henault, for your introduction to MultiNest with high number of parameters, and the interest for applying the method to globular clusters – it broadened my horizon. Mark Gieles contributed to the spherical Jeans modelling by critically assessing the method. Thank you for your friendly welcome at Surrey. iii Thank you, Endre and Niculin. Your enthusiasm for big data and our project on modelling correlations has opened doors. Some special kudos go to Niculin for sharing with me the knowledge about Dvorak-for-Programmers, and the boost his GPG usage has indirectly given my work-flow. Thank you all from the Akademischer Mittelbau des Physikdepartements, who showed me the broader physics science world, PSI, CERN, ABB, IBM, and some of the world aside of physics with canoeing and soccer. You’re great sports! Thank you, Annina. It has been a most gratifying PhD time thanks to your loving affection, all the happiness, and motivation. You are my muse! Z¨urich, March 2015 Pascal S.P. Steger iv Contents Acknowledgements iv Contents ix Abstract xvii Kurzfassung xix 1 Introduction1 1.1 Dark Matter...................................2 1.1.1 Evidence for Dark Matter........................2 1.1.2 What is Dark Matter?..........................6 1.1.3 Direct and Indirect Detection Experiments.............. 12 1.1.4 Cold Dark Matter vs Warm Dark Matter............... 14 1.1.5 Cusps and Cores............................. 16 1.1.6 The Need for Small Scales........................ 17 1.1.7 Predictions from Simulations...................... 19 1.1.8 Dwarf Galaxies.............................. 21 1.2 Mass Modelling.................................. 23 v CONTENTS 1.2.1 Jeans Modelling............................. 23 1.2.2 Other Mass Modelling Approaches................... 24 1.3 Aim of This Thesis................................ 25 2 Mass Modelling Spherical Systems 27 2.1 Introduction.................................... 27 2.2 Method...................................... 30 2.2.1 Derivation of the Key Equations.................... 30 2.2.2 The Mass Distribution.......................... 32 2.2.3 The Tracer Density Profile....................... 33 2.2.4 The Velocity Anisotropy......................... 34 2.2.5 Comparison with Data.......................... 35 2.2.6 Priors................................... 36 2.2.7 Parameter Space Sampling....................... 36 2.3 Mock Data.................................... 37 2.4 Results....................................... 39 2.4.1 Single Tracer Population......................... 39 2.4.2 Two Tracer Populations......................... 42 2.4.3 Triaxial Mock Data........................... 43 2.5 Conclusions.................................... 45 2.6 Appendix..................................... 46 2.6.1 Convergence of the MultiNest Model Ensemble........... 46 2.6.2 Influence of Binning Choices...................... 46 3 Mass Modelling of Fornax 49 3.1 Introduction.................................... 50 3.2 Method...................................... 51 vi CONTENTS 3.2.1 The GravImage Code......................... 51 3.2.2 Priors in Use............................... 53 3.3 Data........................................ 54 3.3.1 Photometry................................ 55 3.3.2 Splitting Populations........................... 55 3.4 Results....................................... 56 3.4.1 Single Component Models without Anisotropy Priors......... 56 3.4.2 Single Component Models with Central Isotropy Prior........ 58 3.4.3 Two Populations split by Mg without Anisotropy Priors....... 60 3.5 Conclusions.................................... 60 4 Mass Modelling of other Dwarf Spheroidals 61 4.1 Introduction.................................... 61 4.2 Baryonic Density Profiles............................ 63 4.3 Data........................................ 63 4.4 Results....................................... 63 4.5 Conclusions.................................... 65 4.6 Further Work................................... 66 4.7 Appendix..................................... 67 4.7.1 Priors in Use............................... 67 5 Simulations of Dwarf Galaxies 69 5.1 Simulation Methods............................... 69 5.1.1 Non-Equilibrium Chemistry....................... 70 5.1.2 Star Formation and Feedback...................... 74 5.1.3 Halo Finding............................... 75 5.1.4 Bound Structures............................. 76 vii CONTENTS 5.1.5 Radial Profile............................... 77 5.1.6 Relaxation Radius............................ 77 5.2 Simulation Suite................................. 78 5.2.1 Initial Conditions............................. 79 5.2.2 Temporal Coverage............................ 85 5.3 Results....................................... 87 5.3.1 Halo Finding............................... 89 5.3.2 Dark Matter Density Profile....................... 95 5.3.3 Stars.................................... 99 5.3.4 Forming Globular Clusters and Dwarfs at High Redshift....... 103 5.4 Conclusions.................................... 103 6 Conclusions and Future Prospects 105 6.1 Conclusions.................................... 105 6.1.1 Addressing the Questions posed at the Start of the Thesis...... 105 6.1.2 Future Prospects............................. 106 Appendix 109 A.1 Plummer Profile................................. 109 A.2 NFW Profile................................... 110 A.3 King Profile.................................... 110 A.4 Sersic Profiles................................... 110 A.5 Prigniel-Simien Profile.............................. 111 A.6 Double-power law Profile............................ 111 A.7 Einasto Profile.................................. 111 A.1 Local Dark Matter Density........................... 115 A.2 Geometry..................................... 116 viii CONTENTS A.3 Representation.................................. 117 ix CONTENTS x List of Figures 1.1 NGC 3198 Rotation Curve............................4 1.2 Milky Way Rotation Curve...........................5 1.3 WDM Simulations................................ 15 1.4 Cosmic Web.................................... 17 1.5 Power Spectrum Fit............................... 18 1.6 Cooling Functions................................ 19 1.7 Fornax Dwarf Spheroidal............................ 21 2.1 Fitting of Analytic Anisotropy......................... 35 2.2 GravImage Data Fit.............................. 39 2.3 Cusped profiles.................................. 40 2.4 Cored Profiles................................... 41 2.5 Cored Profiles..................................
Load more

Recommended publications
  • Star Maps: Where Are the Black Holes?
    BLACK HOLE FAQ’s 1. What is a black hole? A black hole is a region of space that has so much mass concentrated in it that there is no way for a nearby object to escape its gravitational pull. There are three kinds of black hole that we have strong evidence for: a. Stellar-mass black holes are the remaining cores of massive stars after they die in a supernova explosion. b. Mid-mass black hole in the centers of dense star clusters Credit : ESA, NASA, and F. Mirabel c. Supermassive black hole are found in the centers of many (and maybe all) galaxies. 2. Can a black hole appear anywhere? No, you need an amount of matter more than 3 times the mass of the Sun before it can collapse to create a black hole. 3. If a star dies, does it always turn into a black hole? No, smaller stars like our Sun end their lives as dense hot stars called white dwarfs. Much more massive stars end their lives in a supernova explosion. The remaining cores of only the most massive stars will form black holes. 4. Will black holes suck up all the matter in the universe? No. A black hole has a very small region around it from which you can't escape, called the “event horizon”. If you (or other matter) cross the horizon, you will be pulled in. But as long as you stay outside of the horizon, you can avoid getting pulled in if you are orbiting fast enough. 5. What happens when a spaceship you are riding in falls into a black hole? Your spaceship, along with you, would be squeezed and stretched until it was torn completely apart as it approached the center of the black hole.
    [Show full text]
  • The Sky Tonight
    MARCH POUTŪ-TE-RANGI HIGHLIGHTS Conjunction of Saturn and the Moon A conjunction is when two astronomical objects appear close in the sky as seen THE- SKY TONIGHT- - from Earth. The planets, along with the TE AHUA O TE RAKI I TENEI PO Sun and the Moon, appear to travel across Brightest Stars our sky roughly following a path called the At this time of the year, we can see the ecliptic. Each body travels at its own speed, three brightest stars in the night sky. sometimes entering ‘retrograde’ where they The brightness of a star, as seen from seem to move backwards for a period of time Earth, is measured as its apparent (though the backwards motion is only from magnitude. Pictured on the cover is our vantage point, and in fact the planets Sirius, the brightest star in our night sky, are still orbiting the Sun normally). which is 8.6 light-years away. Sometimes these celestial bodies will cross With an apparent magnitude of −1.46, paths along the ecliptic line and occupy the this star can be found in the constellation same space in our sky, though they are still Canis Major, high in the northern sky. millions of kilometres away from each other. Sirius is actually a binary star system, consisting of Sirius A which is twice the On March 19, the Moon and Saturn will be size of the Sun, and a faint white dwarf in conjunction. While the unaided eye will companion named Sirius B. only see Saturn as a bright star-like object (Saturn is the eighth brightest object in our Sirius is almost twice as bright as the night sky), a telescope can offer a spectacular second brightest star in the night sky, view of the ringed planet close to our Moon.
    [Show full text]
  • Stargazer Vice President: James Bielaga (425) 337-4384 Jamesbielaga at Aol.Com P.O
    1 - Volume MMVII. No. 1 January 2007 President: Mark Folkerts (425) 486-9733 folkerts at seanet.com The Stargazer Vice President: James Bielaga (425) 337-4384 jamesbielaga at aol.com P.O. Box 12746 Librarian: Mike Locke (425) 259-5995 mlocke at lionmts.com Everett, WA 98206 Treasurer: Carol Gore (360) 856-5135 janeway7C at aol.com Newsletter co-editor: Bill O’Neil (774) 253-0747 wonastrn at seanet.com Web assistance: Cody Gibson (425) 348-1608 sircody01 at comcast.net See EAS website at: (change ‘at’ to @ to send email) http://members.tripod.com/everett_astronomy nearby Diablo Lake. And then at night, discover the night sky like EAS BUSINESS… you've never seen it before. We hope you'll join us for a great weekend. July 13-15, North Cascades Environmental Learning Center North Cascades National Park. More information NEXT EAS MEETING – SATURDAY JANUARY 27TH including pricing, detailed program, and reservation forms available shortly, so please check back at Pacific Science AT 3:00 PM AT THE EVERETT PUBLIC LIBRARY, IN Center's website. THE AUDITORIUM (DOWNSTAIRS) http://www.pacsci.org/travel/astronomy_weekend.html People should also join and send mail to the mail list THIS MONTH'S MEETING PROGRAM: [email protected] to coordinate spur-of-the- Toby Smith, lecturer from the University of Washington moment observing get-togethers, on nights when the sky Astronomy department, will give a talk featuring a clears. We try to hold informal close-in star parties each month visualization presentation he has prepared called during the spring, summer, and fall months on a weekend near “Solar System Cinema”.
    [Show full text]
  • Turning the Tides on the Ultra-Faint Dwarf Spheroidal Galaxies: Coma
    Turning the Tides on the Ultra-Faint Dwarf Spheroidal Galaxies: Coma Berenices and Ursa Major II1 Ricardo R. Mu˜noz2, Marla Geha2, & Beth Willman3 ABSTRACT We present deep CFHT/MegaCam photometry of the ultra-faint Milky Way satellite galaxies Coma Berenices (ComBer) and Ursa Major II (UMa II). These data extend to r ∼ 25, corresponding to three magnitudes below the main se- quence turn-offs in these galaxies. We robustly calculate a total luminosity of MV = −3.8±0.6 for ComBer and MV = −3.9±0.5 for UMa II, in agreement with previous results. ComBer shows a fairly regular morphology with no signs of ac- tive tidal stripping down to a surface brightness limit of 32.4 mag arcsec−2. Using a maximum likelihood analysis, we calculate the half-light radius of ComBer tobe ′ rhalf = 74±4pc (5.8±0.3 ) and its ellipticity ǫ =0.36±0.04. In contrast, UMa II shows signs of on-going disruption. We map its morphology down to µV = 32.6 mag arcsec−2 and found that UMa II is larger than previously determined, ex- tending at least ∼ 700pc (1.2◦ on the sky) and it is also quite elongated with an ellipticity of ǫ = 0.50 ± 0.2. However, our estimate for the half-light radius, 123 ± 3pc (14.1 ± 0.3′) is similar to previous results. We discuss the implications of these findings in the context of potential indirect dark matter detections and galaxy formation. We conclude that while ComBer appears to be a stable dwarf galaxy, UMa II shows signs of on-going tidal interaction.
    [Show full text]
  • And Ecclesiastical Cosmology
    GSJ: VOLUME 6, ISSUE 3, MARCH 2018 101 GSJ: Volume 6, Issue 3, March 2018, Online: ISSN 2320-9186 www.globalscientificjournal.com DEMOLITION HUBBLE'S LAW, BIG BANG THE BASIS OF "MODERN" AND ECCLESIASTICAL COSMOLOGY Author: Weitter Duckss (Slavko Sedic) Zadar Croatia Pусскй Croatian „If two objects are represented by ball bearings and space-time by the stretching of a rubber sheet, the Doppler effect is caused by the rolling of ball bearings over the rubber sheet in order to achieve a particular motion. A cosmological red shift occurs when ball bearings get stuck on the sheet, which is stretched.“ Wikipedia OK, let's check that on our local group of galaxies (the table from my article „Where did the blue spectral shift inside the universe come from?“) galaxies, local groups Redshift km/s Blueshift km/s Sextans B (4.44 ± 0.23 Mly) 300 ± 0 Sextans A 324 ± 2 NGC 3109 403 ± 1 Tucana Dwarf 130 ± ? Leo I 285 ± 2 NGC 6822 -57 ± 2 Andromeda Galaxy -301 ± 1 Leo II (about 690,000 ly) 79 ± 1 Phoenix Dwarf 60 ± 30 SagDIG -79 ± 1 Aquarius Dwarf -141 ± 2 Wolf–Lundmark–Melotte -122 ± 2 Pisces Dwarf -287 ± 0 Antlia Dwarf 362 ± 0 Leo A 0.000067 (z) Pegasus Dwarf Spheroidal -354 ± 3 IC 10 -348 ± 1 NGC 185 -202 ± 3 Canes Venatici I ~ 31 GSJ© 2018 www.globalscientificjournal.com GSJ: VOLUME 6, ISSUE 3, MARCH 2018 102 Andromeda III -351 ± 9 Andromeda II -188 ± 3 Triangulum Galaxy -179 ± 3 Messier 110 -241 ± 3 NGC 147 (2.53 ± 0.11 Mly) -193 ± 3 Small Magellanic Cloud 0.000527 Large Magellanic Cloud - - M32 -200 ± 6 NGC 205 -241 ± 3 IC 1613 -234 ± 1 Carina Dwarf 230 ± 60 Sextans Dwarf 224 ± 2 Ursa Minor Dwarf (200 ± 30 kly) -247 ± 1 Draco Dwarf -292 ± 21 Cassiopeia Dwarf -307 ± 2 Ursa Major II Dwarf - 116 Leo IV 130 Leo V ( 585 kly) 173 Leo T -60 Bootes II -120 Pegasus Dwarf -183 ± 0 Sculptor Dwarf 110 ± 1 Etc.
    [Show full text]
  • PDF Version of CV
    Tracy M.A. Webb (514) 398-7226 (office) 3600 rue University [email protected] Montr´eal QC H3A 2T8 http://www.physics.mcgill.ca/∼webb papers to date (January 2017): 49 citations to date (January 2017): 1871 Education • University of Toronto Toronto, ON PhD in Astronomy & Astrophysics Sep. 1998 - Oct. 2002 – Adviser: Simon Lilly • McMaster University Hamilton, ON Master of Science in Physics & Astronomy Sep. 1996 - Aug. 1998 – Advisor: Douglas Welch • University of Toronto Toronto, ON Bachelor of Science in Physics and Astronomy Sep. 1992 - May 1996 – Senior Project Advisor: Ray Carlberg Work Experience • Assistant Professor Montreal, QC McGill University Jan 2006 - Present • VENI Fellow Leiden, The Netherlands Leiden Observatory, University of Leiden April 2005 - Jan 2006 – Nederlandse Organisatie voor Wetenschappelijk Onderzoek – part of VENI, VIDI, VICI program • NOVA Fellow Leiden, The Netherlands Leiden Observatory, University of Leiden Oct 2002 - March 2005 – Dutch National Postdoc Awards and Scholarships 2007 University Faculty Award, Natural Sciences and Engineering Council of Canada held at McGill University 2003 J.S.Plaskett Medal (given jointly by the CASCA and RASC for the “most outstanding [Canadian] doctoral thesis in astronomy or astrophysics in the proceeding two calendar years” 2000-2001 Ontario Graduate Scholarship 2000-2001 Sumner Fellowship, Walter C. Sumner Foundation 1999 Ontario Graduate Scholarship in Science and Technology 1999 Frank S. Hogg Memorial Fellowship 1999 C.A. Chant Fellowship 1998 University of Toronto
    [Show full text]
  • 2016Kiaayearbookch 0.Pdf
    北京大学天文学科 2016 年年报 主编 : Richard de Grijs 翻译 ( 英翻中 ): 刘项琨 孙宁晨 数据收集 : 刘树岩 刘逸清 Richard de Grijs 摄影 : 姚 洁 刘树岩 设计印刷： 北京燕园京红彩色印刷设计有限公司 科维理天文与天体物理研究所 物理学院天文学系 中国北京海淀区颐和园路 5 号北京大学，100871 http://kiaa.pku.edu.cn http://vega.bac.pku.edu.cn 目 录 1. 所长致辞：长虑远图 ····································································· 2 2. 2016 年工作亮点 ·········································································· 4 3. 科研亮点 : 刘逸清 ········································································· 7 4. 科研亮点: Smitha Subramanian博士 ········································ 8 5. 科研亮点 : 东苏勃研究员 ·····························································10 6. 科研亮点: 范祖辉教授 ·································································12 7. 新闻报道 ······································································· 14 8. 科研活动: 学术报告和午餐报告·················································· 37 9. 论著成果 ···················································································· 45 10.获奖情况 ···················································································· 61 11. 经费支持 ··················································································· 62 12. 对外影响 ··················································································· 68 13. 会议组织、邀请及其他研讨会 ··················································· 70 14. 学生风采 ·················································································· 82 15. 访问学者 ··················································································· 86 16. 其他重要活动 ············································································
    [Show full text]
  • The Milky Way the Milky Way's Neighbourhood
    The Milky Way What Is The Milky Way Galaxy? The.Milky.Way.is.the.galaxy.we.live.in..It.contains.the.Sun.and.at.least.one.hundred.billion.other.stars..Some.modern. measurements.suggest.there.may.be.up.to.500.billion.stars.in.the.galaxy..The.Milky.Way.also.contains.more.than.a.billion. solar.masses’.worth.of.free-floating.clouds.of.interstellar.gas.sprinkled.with.dust,.and.several.hundred.star.clusters.that. contain.anywhere.from.a.few.hundred.to.a.few.million.stars.each. What Kind Of Galaxy Is The Milky Way? Figuring.out.the.shape.of.the.Milky.Way.is,.for.us,.somewhat.like.a.fish.trying.to.figure.out.the.shape.of.the.ocean.. Based.on.careful.observations.and.calculations,.though,.it.appears.that.the.Milky.Way.is.a.barred.spiral.galaxy,.probably. classified.as.a.SBb.or.SBc.on.the.Hubble.tuning.fork.diagram. Where Is The Milky Way In Our Universe’! The.Milky.Way.sits.on.the.outskirts.of.the.Virgo.supercluster..(The.centre.of.the.Virgo.cluster,.the.largest.concentrated. collection.of.matter.in.the.supercluster,.is.about.50.million.light-years.away.).In.a.larger.sense,.the.Milky.Way.is.at.the. centre.of.the.observable.universe..This.is.of.course.nothing.special,.since,.on.the.largest.size.scales,.every.point.in.space. is.expanding.away.from.every.other.point;.every.object.in.the.cosmos.is.at.the.centre.of.its.own.observable.universe.. Within The Milky Way Galaxy, Where Is Earth Located’? Earth.orbits.the.Sun,.which.is.situated.in.the.Orion.Arm,.one.of.the.Milky.Way’s.66.spiral.arms..(Even.though.the.spiral.
    [Show full text]
  • European Astronomical Society 2016 Prizes Tycho Brahe Prize the 2016 Tycho Brahe Prize Is Awarded to Prof
    European Astronomical Society 2016 Prizes Tycho Brahe Prize The 2016 Tycho Brahe Prize is awarded to Prof. Joachim Trümper in recognition of his visionary development of X-ray instrumentation, from balloon experiments and the discovery of cyclotron lines probing the magnetic field of neutron stars to his leadership and strong scientific involvement in the ROSAT mission. Lodewijk Woltjer Lecture The 2016 Lodewijk Woltjer Lecture is awarded to Prof. Thibault Damour for his outstanding career on theoretical implications of General Relativity and in particular on the prediction of the newly-observed gravitational wave signal of coalescing binary black holes. MERAC Prizes The 2016 MERAC Prizes for the Best Doctoral Thesis are awarded in Theoretical Astrophysics to Dr Maria Petropoulou for her thesis on radiative instabilities and particle acceleration in high-energy plasmas with applications to relativistic jets of active galactic nuclei and gamma-ray bursts. Observational Astrophysics to Dr Yingjie Peng for his thesis on the simplicity of the evolving galaxy population and the origin of the Schechter form of the galaxy stellar mass function. New Technologies to Dr Oliver Pfuhl for his thesis on an innovative design of two subsystems for the VLTI instrument GRAVITY: the fibre coupler and the guiding system. All five awardees are invited to give a plenary lecture at the European Week of Astronomy and Space Science (EWASS) to be held in Athens, Greece on 4 – 8 July 2016. The European Astronomical Society (EAS) promotes and advances astronomy in Europe. As an independent body, the EAS is able to act on matters that need to be handled at a European level on behalf of the European astronomical community.
    [Show full text]
  • 第 28 届国际天文学联合会大会 Programme Book
    IAU XXVIII GENERAL ASSEMBLY 20-31 AUGUST, 2012 第 28 届国际天文学联合会大会 PROGRAMME BOOK 1 Table of Contents Welcome to IAU Beijing General Assembly XXVIII ........................... 4 Welcome to Beijing, welcome to China! ................................................ 6 1.IAU EXECUTIVE COMMITTEE, HOST ORGANISATIONS, PARTNERS, SPONSORS AND EXHIBITORS ................................ 8 1.1. IAU EXECUTIVE COMMITTEE ..................................................................8 1.2. IAU SECRETARIAT .........................................................................................8 1.3. HOST ORGANISATIONS ................................................................................8 1.4. NATIONAL ADVISORY COMMITTEE ........................................................9 1.5. NATIONAL ORGANISING COMMITTEE ..................................................9 1.6. LOCAL ORGANISING COMMITTEE .......................................................10 1.7. ORGANISATION SUPPORT ........................................................................ 11 1.8. PARTNERS, SPONSORS AND EXHIBITORS ........................................... 11 2.IAU XXVIII GENERAL ASSEMBLY INFORMATION ............... 14 2.1. LOCAL ORGANISING COMMITTEE OFFICE .......................................14 2.2. IAU SECRETARIAT .......................................................................................14 2.3. REGISTRATION DESK – OPENING HOURS ...........................................14 2.4. ON SITE REGISTRATION FEES AND PAYMENTS ................................14
    [Show full text]
  • Research Collection
    Research Collection Doctoral Thesis Tracing early structure in the high redshift Universe Author(s): Diener, Catrina Publication Date: 2015 Permanent Link: https://doi.org/10.3929/ethz-a-010639768 Rights / License: In Copyright - Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library DISS. ETH NO. 23072 Tracing early structure in the high redshift Universe A thesis submitted to attain the degree of DOCTOR OF SCIENCES of ETH ZURICH Dr. sc. ETH Zurich presented by Catrina Diener MSc ETH Physics, ETH Zurich born on 02.03.1987 citizen of Fischenthal ZH accepted on the recommendation of Prof. Dr. Simon Lilly, examiner Prof. Dr. Simon Morris, co-examiner 2015 To my family: my mother Ursula and my sister Christina iii iv Abstract Structure and its growth significantly drive the evolution and properties of our Universe. On large enough scales the distribution and extent of structure is mostly seeded by pri- mordial density fluctuations. Its observation therefore constitutes a direct test of our cosmological model and our understanding of how structures form and evolve within the framework of that model. Furthermore galaxies evolve within the context of their sur- rounding dark matter structure: the exact properties this environment and connected with that the proximity to (or absence of) other galaxies has significant impact on this evolution. In this thesis we study tracers of structure in the early Universe, at 2 . z . 3, using two different approaches. On the one hand we focus on overdensities of galaxies, both their identification and properties.
    [Show full text]
  • Brightest Stars : Discovering the Universe Through the Sky's Most Brilliant Stars / Fred Schaaf
    ffirs.qxd 3/5/08 6:26 AM Page i THE BRIGHTEST STARS DISCOVERING THE UNIVERSE THROUGH THE SKY’S MOST BRILLIANT STARS Fred Schaaf John Wiley & Sons, Inc. flast.qxd 3/5/08 6:28 AM Page vi ffirs.qxd 3/5/08 6:26 AM Page i THE BRIGHTEST STARS DISCOVERING THE UNIVERSE THROUGH THE SKY’S MOST BRILLIANT STARS Fred Schaaf John Wiley & Sons, Inc. ffirs.qxd 3/5/08 6:26 AM Page ii This book is dedicated to my wife, Mamie, who has been the Sirius of my life. This book is printed on acid-free paper. Copyright © 2008 by Fred Schaaf. All rights reserved Published by John Wiley & Sons, Inc., Hoboken, New Jersey Published simultaneously in Canada Illustration credits appear on page 272. Design and composition by Navta Associates, Inc. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Section 107 or 108 of the 1976 United States Copyright Act, without either the prior written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600, or on the web at www.copy- right.com. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http://www.wiley.com/go/permissions.
    [Show full text]