DOCSLIB.ORG

The Structure and Dynamics of the AC114 Galaxy Cluster Revisited

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Structure and Dynamics of the AC114 Galaxy Cluster Revisited MNRAS 452, 3304–3318 (2015) doi:10.1093/mnras/stv1558 The structure and dynamics of the AC114 galaxy cluster revisited Dominique Proust,1‹ Irina Yegorova,2 Ivo Saviane,2 Valentin D. Ivanov,2 Fabio Bresolin,3 John J. Salzer4 and Hugo V. Capelato5,6 1Observatoire de Paris-Meudon, GEPI, F-92195 MEUDON, France 2European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago de Chile 19, Chile 3Institute for Astronomy, 2680 Woodlawn Drive Honolulu, HI 96822, USA 4Department of Astronomy, Indiana University, 727 East Third Street, Bloomington, IN 47405, USA 5Divisao˜ de Astrof´ısica, INPE-MCT, 12227-010 Sao˜ Jose´ dos Campos, Sao˜ Paulo, SP, Brazil 6Nucleo´ de Astrof´ısica Teoretica,´ Universidade Cruzeiro do Sul, rua Galvao˜ Bueno 868, CEP 01506-200, Sao˜ Paulo, SP, Brazil Downloaded from Accepted 2015 July 10. Received 2015 July 9; in original form 2014 May 16 ABSTRACT http://mnras.oxfordjournals.org/ We present a dynamical analysis of the galaxy cluster AC114 based on a catalogue of 524 velocities. Of these, 169 (32 per cent) are newly obtained at European Southern Observatory (Chile) with the Very Large Telescope and the VIsible MultiObject spectrograph. Data on individual galaxies are presented and the accuracy of the measured velocities is discussed. Dynamical properties of the cluster are derived. We obtain an improved mean redshift value z = ± σ = +73 −1 0.31665 0.0008 and velocity dispersion 1893−82 km s . A large velocity dispersion within the core radius and the shape of the infall pattern suggests that this part of the cluster is −1 in a radial phase of relaxation with a very elongated radial filament spanning 12 000 km s . at Instituto Nacional de Pesquisas Espaciais on September 29, 2015 A radial foreground structure is detected within the central 0.5 h−1 Mpc radius, recognizable as a redshift group at the same central redshift value. We analyse the colour distribution for this archetype Butcher–Oemler galaxy cluster and identify the separate red and blue galaxy sequences. The latter subset contains 44 per cent of confirmed members of the cluster, reaching magnitudes as faint as Rf= 21.1 (1.0 mag fainter than previous studies). We derive a mass 15 −1 M200 = (4.3 ± 0.7) × 10 M h . In a subsequent paper, we will utilize the spectral data presented here to explore the mass–metallicity relation for this intermediate redshift cluster. Key words: galaxies: clusters: general – galaxies: distances and redshifts – galaxies: evolution – cosmology: observations – distance scale – large-scale structure of Universe. Chandra and XMM data analyses. Finally, mass estimates based on 1 INTRODUCTION gravitational lensing are considered more reliable than the others Redshift surveys of clusters of galaxies are needed to study their (e.g. Mellier 1999) because they are completely independent of dynamical and evolutionary state. In clusters, the mean redshift the dynamical status of the cluster. The drawback is that lensing is a key ingredient in deriving distances, allowing the study of cannot probe the mass profile beyond the virial radius of clusters. matter distribution on very large scales. Analysis of the velocity The discrepancies among the methods may come from the non- distribution within clusters can lead to an estimate of the virial equilibrium effects in the central region of the clusters (Allen 1998). mass, constraining models of the dark matter content. Dynamical In this paper, we build upon previous studies of the dynami- mass estimates complement measurements at other wavelengths, in cal status of the cluster AC114 with the addition of a new set of particular those obtained through X-ray observations of clusters. velocities. The observations of radial velocities reported here are However, discrepancies between optical, spectroscopic and X-ray part of a program to study the mass–metallicity relation (MZR) in mass estimators are often found (e.g. Girardi et al. 1998; Allen 2000; AC114 (Saviane et al. 2014; Saviane et al., in preparation), which is Cypriano et al. 2005). Virial mass estimates rely on the assumption a powerful diagnostic of galaxy evolution, as first shown by Larson of dynamical equilibrium. X-ray mass estimates also depend on (1974). Note that the sensitivity of available instruments at 10m- the dynamical equilibrium hypothesis and on the still not well- class telescopes does not allow for the accurate determination of constrained intracluster gas temperature gradient (e.g. Leccardi & the MZR at the highest redshifts, but for AC114 at z ∼ 0.32 we are Molendi 2008) although it is much better established from both able to measure abundances reliably. The AC114 cluster (RA = 22h58m52s.3 Dec. =−34◦4655 J2000) is classified as Bautz–Morgan type II–III by Abell, Corwin & E-mail: [email protected] Olowin (1989). It is the archetype object of the Butcher–Oemler C 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society The galaxy cluster AC114 3305 (BO) effect with a higher fraction of blue, late-type galaxies than in Table 1. Observing blocks of AC114. lower redshift clusters, rising to 60 per cent outside the core region a b (Couch et al. 1998; Sereno, Lubini & Jetzer 2010). OBID Date OB start Exp. time Filter Grism AC114 has 724 galaxies listed in SIMBAD in an area of 382919 2009-09-17 02:37 2250 GG475 HR red ∼10 arcmin × 10 arcmin, and 585 of them are classified as emission- 382920 2009-09-17 03:32 2250 GG475 HR red line galaxies. It has been observed several times. For example, 382921 2009-09-17 04:11 2250 GG475 HR red Couch & Sharples (1987) derived 51 velocities (42 cluster mem- 382922 2009-09-17 04:50 2250 GG475 HR red bers), Couch et al. (2001) with 51 H α emitting cluster members, 382923 2009-09-17 05:28 2250 GG475 HR red and more recently in the 2dF survey (Colless et al. 2003) and the 6dF 382924 2009-09-17 06:07 2250 GG475 HR red survey (Jones et al. 2009). A total of 308 velocities are available in 382925 2009-09-21 03:54 2250 GG475 HR red the NASA/IPAC Extragalactic Database (NED) within a 10 arcmin 382926 2009-08-16 05:25 2250 GG475 MR radius, 348 within 20 arcmin and 414 within 30 arcmin. AC114 382927 2009-08-16 06:15 2250 GG475 MR has a compact core dominated by a cD galaxy and a strong lensing 382928 2009-08-16 06:55 2250 GG475 MR power with several bright arcs and multiple image sources (Smail 382929 2009-08-21 07:24 2250 GG475 MR Downloaded from 382930 2009-08-21 06:11 2250 GG475 MR et al. 1995; Natarajan et al. 1998; Campusano et al. 2001). It is a hot = 382931 2009-09-25 04:02 2250 GG475 MR X-ray emitter (kT 8.0 keV) with an irregular morphology. Below 382932 2009-09-25 04:53 2250 GG475 MR 0.5 keV, the X-ray emission is dominated by two main components: a the cluster, roughly centred on the optical position of AC 114, and a Notes. beginning of the observation block, UT time. bexposure time of the science part, in seconds. diffuse tail, extending almost 400 kpc from the cluster centre to the http://mnras.oxfordjournals.org/ south-east. The cD galaxy is shifted with respect to the centroid of maximum number of slits in each of the four quadrants. Such a visual the X-ray emission but aligned in the general direction of the X-ray inspection allows us to discriminate between extended objects and brightness elongation (see de Filippis et al. 2004). An extensive stars. study of AC114 based on a multiwavelength strong lensing analysis The 14 awarded hours of observations were done on 2009 August of baryons and dark matter from Sereno et al. (2010) provided evi- 16 and 21, and September 17, 21 and 25 (see Table 1). Execution dence of dynamical activity, with the dark matter distribution being time for each observing block was 60 min, including 22.5 min of shifted and rotated with respect to the gas, following the galaxy overheads. Observing blocks were prepared for both MR and HR- density in terms of both shape and orientation. Based on the lensing red grisms. For each grism observing block was repeated seven and X-ray data, they argue that the cluster extends in the plane of times. The total integration time on target galaxies is 4.37 h for each at Instituto Nacional de Pesquisas Espaciais on September 29, 2015 the sky and is not affected by the lensing overconcentration bias. As grism. our observations increase by 32 per cent the data available for this Fig. 1 shows the projected map in RA and Dec. of our program cluster, we expand the dynamical analysis of AC114 in this paper. − galaxies in AC114 out to a velocity cz = 120 000 km s 1.Note The MZR is developed in Saviane et al. (2014) and Saviane et al. that most of the objects in the central part represent four clumps (in preparation). corresponding to the four VIMOS quadrants of a VLT mask. The We present in Section 2 the details of the observations and data other galaxies spread in the field are objects already observed with reduction. In Section 3, we discuss the distribution and the velocity velocities published in the literature. analysis of the cluster galaxies. Section 4 describes the kinematical The data reduction was carried out independently at Euro- structures of AC114 and Section 5 makes the analysis of the distri- pean Southern Observatory (ESO)-Santiago and Paris-Meudon bution in colour and the BO effect while in Section 6 we analyse the dynamical mass determinations of AC114.
Load more

Recommended publications
  • Astronomy Astrophysics
    A&A 447, 133–144 (2006) Astronomy DOI: 10.1051/0004-6361:20052838 & c ESO 2006 Astrophysics Structure and dynamics of the Shapley Supercluster Velocity catalogue, general morphology and mass D. Proust1,H.Quintana2, E. R. Carrasco3, A. Reisenegger2, E. Slezak4,H.Muriel5, R. Dünner2, L. Sodré Jr.6,M.J.Drinkwater7,Q.A.Parker8, and C. J. Ragone5 1 GEPI, Observatoire de Paris-Meudon, 92195 Meudon Cedex, France e-mail: [email protected] 2 Departamento de Astronomía y Astrofisica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile 3 Gemini Observatory, Southern Operations Center c/o AURA, Casilla 603, La Serena, Chile 4 Observatoire de Nice, 06304 Nice Cedex 4, France 5 Grupo de Investigaciones en Astronomía Teórica y Experimental, Observatorio Astrónomico, Laprida 854, 5000 Córdoba, Argentina, and CONICET, Buenos Aires, Argentina 6 Instituto de Astronomia, Geofísica e Ciências Atmosféricas, R. do Matão 1226, CEP 05508-090 São Paulo/SP Brazil 7 Department of Physics, University of Queensland, QLD 4072, Australia 8 Department of Physics, Macquarie University, NSW 2109, Australia, and Anglo-Australian Observatory, PO Box 296, Epping NSW 1710, Australia Received 8 February 2005 / Accepted 28 September 2005 ABSTRACT We present results of our wide-field redshift survey of galaxies in a 285 square degree region of the Shapley Supercluster (SSC), based on a set of 10 529 velocity measurements (including 1201 new ones) on 8632 galaxies obtained from various telescopes and from the literature. Our data reveal that the main plane of the SSC (v ≈ 14 500 km s−1) extends further than previous estimates, filling the whole extent of our survey region of 12 degrees by 30 degrees on the sky (30 × 75 h−1 Mpc).
    [Show full text]
  • The Large Scale Distribution of Galaxies in the Shapley Supercluster
    CSIRO PUBLISHING www.publish.csiro.au/journals/pasa Publications of the Astronomical Society of Australia, 2004, 21, 89–96 The Large Scale Distribution of Galaxies in the Shapley Supercluster Michael J. Drinkwater,1 Quentin A. Parker,2,3 Dominique Proust,4 Eric Slezak,5 and Hernán Quintana 6 1 Department of Physics, University of Queensland, QLD 4072, Australia (e-mail: [email protected]) 2 Department of Physics, Macquarie University, NSW 2109, Australia 3 Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia (e-mail: [email protected]) 4 GEPI — Observatoire de Paris–Meudon, 92195 Meudon CEDEX, France (e-mail: [email protected]) 5 Observatoire de Nice, 06304 Nice CEDEX4, France (e-mail: [email protected]) 6 Departamento de Astronomia y Astrofisica, Pontificia Universidad Católica de Chile, Casilla 104, Santiago 22, Chile (e-mail: [email protected]) Received 2003 October 13, accepted 2003 December 10 Abstract: We present new results of our wide-field redshift survey of galaxies in a 182 square degree region of the Shapley Supercluster (SSC) based on observations with the FLAIR-II spectrograph on the UK Schmidt Telescope (UKST). In this paper we present new measurements to give a total sample of redshifts for 710 bright (R ≤ 16.6) galaxies, of which 464 are members of the SSC (8000 <v<18 000 km s−1). Our data reveal that the main plane of the SSC (v ≈ 14 500 km s−1) extends further than previously realised, filling the whole extent of our survey region of 10 degrees by 20 degrees on the sky (35 Mpc by 70 Mpc, for −1 −1 H0 = 75 km s Mpc ).
    [Show full text]
  • Winter 2007 Gems & Gemology
    G EMS & G VOLUME XLIII WINTER 2007 EMOLOGY CVD Synthetic Diamonds Canary Tourmaline W Fluorescence Spectroscopy INTER Napoleon Necklace 2007 P AGES 291–408 V OLUME 43 N O. 4 THE QUARTERLY JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA ® Winter 2007 VOLUME 43, NO. 4 291 LETTERS ________ FEATURE ARTICLES _____________ 294 Latest-Generation CVD-Grown Synthetic Diamonds from Apollo Diamond Inc. Wuyi Wang, Matthew S. Hall, Kyaw Soe Moe, Joshua Tower, and Thomas M. Moses Presents the gemological and spectroscopic properties of Apollo’s latest products, which show significant improvements in size, color, and clarity. 314 Yellow Mn-rich Tourmaline from the Canary Mining Area, Zambia pg. 295 Carat Points Brendan M. Laurs, William B. Simmons, George R. Rossman, Eric A. Fritz, John I. Koivula, Björn Anckar, and Alexander U. Falster Explores the vivid “canary” yellow elbaite from the Lundazi District of eastern Zambia, the most important source of this tourmaline. 332 Fluorescence Spectra of Colored Diamonds Using a Rapid, Mobile Spectrometer Sally Eaton-Magaña, Jeffrey E. Post, Peter J. Heaney, Roy A. Walters, Christopher M. Breeding, and James E. Butler Reports on the use of fluorescence spectroscopy to characterize colored diamonds from the Aurora Butterfly and other collections. NOTES AND NEW TECHNIQUES ________ 352 An Examination of the Napoleon Diamond Necklace Eloïse Gaillou and Jeffrey E. Post pg. 329 Provides a history and gemological characterization of this historic necklace. REGULAR FEATURES _____________________ 358 Lab Notes Apatite in spessartine • Atypical photoluminescence feature in a type IIa diamond • Diamond with “holiday” inclusions • Diamond with large etch channels containing iron sulfides • Black diamond with an oriented etch channel • The pareidolia of diamonds • Notable emerald carving • Gold coated onyx • Double-star sapphire • Imitation turquoise 366 Gem News International Record auction prices for diamonds • Namibian diamond mining pg.
    [Show full text]
  • Le Magazine En
    NuMéRO 11 - SOLSTICE D’hIVER 2009 LE MAGAZINE DE L’OBSERVATOIRE DE pARIS NuMBER 11 - wINTER SOLSTICE 2009 OBSERVATOIRE DE pARIS: ThE MAGAZINE CONTENTS SOMMAIRE research C news from the laboratories C luth: Grey matter searching for dark matter, with energy C lerma: big bang: towards an even faster inflation? C lesia: marco Polo: bringing asteroid samples back to earth C imcce: the capture of the trojans C nançay: an intelligent chip for radio astronomy C syrte: the quest for an ever more accurate atomic clock C GePi: X-shooter sheds a light on the very outer regions of DIRECTEuR DE LA puBLICATION the universe Daniel Egret, président de l’Observatoire de paris C aPc: as seen from earth and from space: complementary perspectives of a galaxy RéDACTRICE EN ChEf Brigitte Bourdon, directrice de la Communication 03 RéDACTION Éditorial Journaliste scientifique : Gaëlle Degrez (pp. 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18) Rédacteurs : frédérique Auffret, Brigitte Bourdon, frédéric Guérin 04 Coordination : Brigitte Bourdon Vie de l’Établissement Ont participé à ce numéro : Christiane Adam, Iara Dos Santos, life at our institution Daniel Egret, Sandrine Marchal, Sabrina Thiéry, Emmanuel Vergnaud Remerciements au service Scolarité, 06 au CIAS et aux secrétariats des laboratoires de l’Observatoire et de l’école doctorale diffusion de la culture scientifique Astronomie et Astrophysique d’Île-de-france. et technique Public outreach COMITé DE RéDACTION Jean-Eudes Arlot, Roland Barillet, Nicolas Biver, françoise Combes, Michel Combes, Noël Dimarcq, Daniel Egret, 08 Thérèse Encrenaz, Bertrand flouret, Marie-france Landréa, franck Le petit, ÉVÉnement / eVent Dominique proust, Jean-Luc Robert, C cosmos, un cheminement jusqu’aux confins de l’univers Catherine Turon, Jean-paul Zahn, Claude Zeippen.
    [Show full text]
  • The Structure and Dynamics of the AC114 Galaxy Cluster Revisited
    Mon. Not. R. Astron. Soc. 000, 000–000 (0000) Printed 8 May 2018 (MN LATEX style file v2.2) The structure and dynamics of the AC114 galaxy cluster revisited ⋆ Dominique Proust1, Irina Yegorova2, Ivo Saviane2, Valentin D. Ivanov2 Fabio Bresolin3 John J. Salzer4 and Hugo V. Capelato5,6 1Observatoire de Paris-Meudon, GEPI, F92195 MEUDON, France 2European Southern Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago de Chile 19, Chile 3Institute for Astronomy, 2680 Woodlawn Drive Honolulu, HI 96822 USA 4Department of Astronomy, Indiana University, 727 East Third Street, Bloomington, IN 47405, USA 5Divis˜ao de Astrof´ısica, INPE-MCT, 12227-010 S˜ao Jos´edos Campos, S˜ao Paulo, SP, Brazil 6N´ucleo de Astrof´ısica Te´oretica, Universidade Cruzeiro do Sul, rua Galv˜ao Bueno 868, CEP 01506-200, S˜ao Paulo, SP, Brazil Accepted date / Received date; in original form ABSTRACT We present a dynamical analysis of the galaxy cluster AC114 based on a catalogue of 524 velocities. Of these, 169 (32%) are newly obtained at ESO (Chile) with the VLT and the VIMOS spectrograph. Data on individual galaxies are presented and the ac- curacy of the measured velocities is discussed. Dynamical properties of the cluster are derived. We obtain an improved mean redshift value z =0.31665±0.0008 and velocity +73 −1 dispersion σ = 1893−82 kms . A large velocity dispersion within the core radius and the shape of the infall pattern suggests that this part of the cluster is in a radial phase of relaxation with a very elongated radial filament spanning 12000 km s−1.
    [Show full text]
  • Summer 2007 Gems & Gemology
    G EMS & G VOLUME XLIII SUMMER 2007 EMOLOGY S UMMER 2007 P AGES 95–196 Global Rough Diamond Production V Durability Testing of Filled Emeralds OLUME Chinese Freshwater Pearl Culture 43 N O. 2 THE QUARTERLY JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA ® Summer 2007 VOLUME 43, NO. 2 95 LETTERS _____________ FEATURE ARTICLES _____________ 98 Global Rough Diamond Production since 1870 Carat Points A. J. A. (Bram) Janse Reports and analyzes annual production statistics (by carat weight and value) for the world’s most significant diamond sources, through 2005. 120 Durability Testing of Filled Emeralds Mary L. Johnson A long-term, systematic study of the stability and durability of nine common pg. 99 emerald-filling substances. NOTES AND NEW TECHNIQUES ________ 138 Continuity and Change in Chinese Freshwater Pearl Culture Doug Fiske and Jeremy Shepherd Reviews recent developments in China’s freshwater cultured pearl production, including the new “fireball” cultured pearls. RAPID COMMUNICATIONS ________ 146 Yellowish Green Diopside and Tremolite from Merelani, Tanzania Eric A. Fritz, Brendan M. Laurs, Robert T. Downs, and Gelu Costin pg. 140 149 Polymer-Impregnated Turquoise Kyaw Soe Moe, Thomas M. Moses, and Paul Johnson REGULAR FEATURES _____________________ 153 Lab Notes Diamond with bimineralic inclusions • HPHT-treated type Ia diamond with a green compo- nent caused by the H2 defect • Diamond with intense “rainbow graining” • Natural color hydrogen-rich blue-gray diamond • Type IIa diamond with intense green color introduced by Ni-related defects • Diamond with zigzag cleavage • HPHT-grown synthetic diamond crystal with unusual morphology and negative trigons • Idocrase in jadeite • Opal with unusual structure 162 Gem News International Bar code technology applied to diamonds • U.S.
    [Show full text]
  • The Role of Astronomy in Society and Culture Iau
    Cambridge University Press 978-0-521-76477-3 — The Role of Astronomy in Society and Culture (IAU S260) Edited by David Valls-Gabaud , Alexander Boksenberg Frontmatter More Information THE ROLE OF ASTRONOMY IN SOCIETY AND CULTURE IAU SYMPOSIUM No. 260 COVER ILLUSTRATION This is an adaptation created by Emmanuel Vergnaud, based on the original painting by Guellen (see page 286) to illustrate a book on astronomy for children. Credit: Emmanuel Vergnaud and Guellen, reproduced with the permission of the artists. © in this web service Cambridge University Press www.cambridge.org Cambridge University Press 978-0-521-76477-3 — The Role of Astronomy in Society and Culture (IAU S260) Edited by David Valls-Gabaud , Alexander Boksenberg Frontmatter More Information IAU SYMPOSIUM PROCEEDINGS SERIES 2009 EDITORIAL BOARD Chairman I.F. CORBETT, IAU Assistant General Secretary European Southern Observatory Karel-Schwarzschild-Strasse 2 D-85748 Garching-bei-M¨unchen Germany [email protected] Advisers K.A. VAN DER HUCHT, IAU General Secretary, SRON Netherlands Institute for Space Research, Utrecht, the Netherlands E.J. DE GEUS, Dynamic Systems Intelligence B.V., Assen, the Netherlands U. GROTHKOPF, European Southern Observatory, Germany M.C. STOREY, Australia Telescope National Facility, Australia Members IAUS260 DAVID VALLS-GABAUD, GEPI - Observatoire de Paris, 92195 Meudon, France IAUS261 S. A. KLIONER, Dresden Technical University, 01062 Dresden, Germany IAUS262 G. R. BRUZUAL, CIDA, 5101-A Merida, Venezuela IAUS263 J. A. FERNANDEZ, Depto. Astronomia, 11400 Montevideo, Uraguay IAUS264 A. KOSOVICHEV, Stanford University, Stanford, CA 94305-4085, USA IAUS265 K. CUNHA, NOAO, La Serena, Chile IAUS266 R. DE GRIJS, University of Sheffield, Sheffield, UK IAUS267 B.
    [Show full text]
  • L'ensemble Claude Gervaise
    1979 August A oût Number Numero Office:- Rcom No. 1265 Editor:- Michael W. Ovenden Téléphone 3 43-5889 La Place desLA Arts fait de nombreux PLACE âtres offrait un double défi aux archi- DES ARTS efforts pour rendre plus accessible sa tectes à savoir contenir deux théâtres programmation à un plus large public. dans un seul immeuble et en assurer la Elle a adopté une politique culturelle complete autonomie, le tout à ériger en en fonction de deux objectifs qui sont: ll mois! -offrir par diverses activites d'ani- Le Théâtre Maisonneuve est une ver- mation des spectacles à prix populaires sion moderne du théâtre à l'italienne. tant pour adultes que pour enfants. La decoration tout en étant d'une grande (Ces activites d'animation se presen- sobriété dispose tout de même de plu- tent sous forme de conferences sur l'art sieurs oeuvres d'art. Quant au Port- avec des expositions, des concerts-midi, Royal, il est muni d'une scène d'une sons et brioches, le dimanche matin ... ) largeur exceptionnelle. En effet, cellede -faire en sorte que ces spectacles la Salle Wilfrid-Pelletier est de 21m tan- soient pour lepublicuneinitiational'art. dis que celle du Port-Royal peut aller Caractéristique originate, la Place jusqu'a 29,2 m. La salle du Port-Royal des Arts ouvre ses portes non seulement servant surtout pour la presentation de le soir mais aussi le jour contrairement pieces de théâtres permet aussi, grâce à la plupart des autres salles qui de- à son equipement et ses dimensions mo- meurent fermees durant le jour.
    [Show full text]
  • Downloaded At: VAT Numbers of Stars Is Essential
    NUMBER 116 AUGUST 2009 NEWSLETTER ANGLO-AUSTRALIAN OBSER AAOmega maps the ISM towards ω Centauri VAT OR Y II I Equivalent width maps of the [Ca ] K line, [Na ] D2 line, their ratio, and the Diffuse Interstellar Band at 5780 Å, in Galactic coordinates. The strength of these tracers relative to one another depends on the conditions in the gas. Structure is present both on small and large scales, across the region and along the path through the Galactic Disc and Halo. content 3 IRIS2 observes Kaguya’s demise (Jeremy Bailey, Steve Lee and Hakan Svedhem) 4 How the brightest globular cluster shines a light on diffuse gas in our Galaxy (J. Th. van Loon et al.) 7 Pushing the Doppler limit: first results from the AAPS (Simon O’Toole et al.) 10 The AAOmega mini-shuffle observing mode (Rob Sharp) 14 Measuring the QSO-cluster relation in two large quasar groups (J.T. Lauroesch et al.) s 15 TCS project (Steve Lee for the TCS team) 25 A slice of the universe: final data release of the 6dF Galaxy Survey (Heath Jones et al.) DIRECTOR DIRECTOR’S MESSAGE I’m delighted to report that the AAO’s future beyond the end of the AAT Agreement on 30 June 2010 has now been secured. With the final withdrawal of the UK on that date, the Anglo-Australian Observatory will become the Australian Astronomical Observatory, operating under the Department of Innovation, Industry, Science & ’ S MESSAGE Research (DIISR). Funding for the final year of the old AAO (2009-10) and the first three years of the new AAO (2010-13) was provided in the Australian Government Budget released in May.
    [Show full text]
  • Opening Ceremony Paris, 15–16 January 2009 International Year of Astronomy 2009
    THE UNIVERSE YOURS TO DISCOVER INTERNATIONAL YEAR OF ASTRONOMY Opening Ceremony Paris, 15–16 January 2009 International Year of Astronomy 2009 Opening Ceremony Paris, 15–16 January 2009 UNESCO Message from UNESCO Director-General Message from IAU President As lead UN agency for the Year, UNESCO will work with the Organization for Nuclear Research (CERN) which aims to throw Dear friends, colleagues and astronomy enthusiasts, This ceremony, and indeed the entire IYA2009, would not International Astronomical Union and other partners to make light on the origin of the Universe, people have always looked have reached this stage without the support of thousands of the initiative a success. In particular, we will encourage citizens to the sky for answers to the questions ‘How did we get here’ Welcome to the International Year of Astronomy 2009! It has groups and individuals around the world. In particular, I would of the world, especially young people, to learn more about the and ‘Why are we here’. taken many years of planning and organising, but we are finally like to thank our Global Sponsors, Thales Alenia Space and Universe in which we live and to explore the links that astron- ready to embark on what is destined to be a year full of discov- Celestron, whose belief in IYA2009 has been unwavering. omy provides between the scientific and cultural spheres. The sky belongs to everybody. Astronomy is and can be an ery and wonder. instrument to promote peace and understanding among I would also like to take this opportunity to give thanks to the UNESCO’s Member States give high importance to science nations and as such is at the heart of UNESCO’s mission.
    [Show full text]
  • Le Magazine De L'observatoire De Paris
    2307mp 22/03/07 13:30 Page 1 NUMÉRO 7 - ÉQUINOXE DE PRINTEMPS 2007 LE MAGAZINE DE L’OBSERVATOIRE DE PARIS NUMBER 7 - SPRING EQUINOX 2007 OBSERVATOIRE DE PARIS: > Événement : les hautes énergies THE MAGAZINE saluées par le Prix Descartes > Retour sur COROT : l’’aventure ne fait que commencer > Commémorations 2007 : Lalande et Lœwy > Event:: Descartes Priize for very hiigh energy > COROT:: the adventure has jjust begun > Commemoratiions 2007:: Lallande and Lœwy 2307mp 22/03/07 13:30 Page 2 CONTENTS SOMMAIRE ! PORTRAIT SENSIBLE : ANNIE BAGLIN, envers et contre tout ! COLLOQUES ET RENCONTRES SCIENTIFIQUES RESEARCH ! NEWS FROM THE LABORATORIES ! APC: A famous guest for an unsolved mystery ! LUTH: Intermediate black holes: a hypothesis gone with the wind! ! GEPI: The Milky Way’s early and fiery heart ! Nançay: KLUN: tapping hydrogen’s wealth of information ! LERMA: Exoplanets orbiting Red dwarf stars COUVERTURE 03 ! IMCCE: Celestial mechanics opens up to the public L’un des quatre collecteurs de HESS. ÉDITORIAL ! SYRTE: Because satellites have no time to waste! © APC, A. Djannati-Atai EDITORIAL ! LESIA: COROT: the adventure has just begun ! PORTRAIT: ANNIE BAGLIN - Never say die 04 ! SCIENTIFIC MEETINGS AND COLLOQUIA VIE DE L’ÉTABLISSEMENT LIFE AT OUR INSTITUTION 18 ENSEIGNEMENT 06 ! Sciences à distance ÉVÉNEMENT ! Soutenances de thèses ! Observatoire HESS : TEACHING l’envolée des très hautes énergies ! Science from a distance ! Trois questions à… HÉLÈNE SOL, ! Defense of doctoral dissertations Coresponsable HESS à l’Observatoire de Paris EVENT ! The HESS Observatory: very high energy takes off ! Three questions to… HÉLÈNE SOL, Co-responsible for the HESS project at the Observatoire de Paris DIRECTEUR DE LA PUBLICATION Daniel Egret, président de l’Observatoire de Paris RÉDACTRICE EN CHEF 08 Brigitte Bourdon, directrice de la Communication RECHERCHE RÉDACTION ! L’ACTUALITÉ DE TOUS Journalistes scientifiques : Paul de Brem (pp.
    [Show full text]
  • Structure and Dynamics of the Shapley Supercluster
    A&A 447, 133–144 (2006) Astronomy DOI: 10.1051/0004-6361:20052838 & c ESO 2006 Astrophysics Structure and dynamics of the Shapley Supercluster Velocity catalogue, general morphology and mass D. Proust1,H.Quintana2, E. R. Carrasco3, A. Reisenegger2, E. Slezak4,H.Muriel5, R. Dünner2, L. Sodré Jr.6,M.J.Drinkwater7,Q.A.Parker8, and C. J. Ragone5 1 GEPI, Observatoire de Paris-Meudon, 92195 Meudon Cedex, France e-mail: [email protected] 2 Departamento de Astronomía y Astrofisica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile 3 Gemini Observatory, Southern Operations Center c/o AURA, Casilla 603, La Serena, Chile 4 Observatoire de Nice, 06304 Nice Cedex 4, France 5 Grupo de Investigaciones en Astronomía Teórica y Experimental, Observatorio Astrónomico, Laprida 854, 5000 Córdoba, Argentina, and CONICET, Buenos Aires, Argentina 6 Instituto de Astronomia, Geofísica e Ciências Atmosféricas, R. do Matão 1226, CEP 05508-090 São Paulo/SP Brazil 7 Department of Physics, University of Queensland, QLD 4072, Australia 8 Department of Physics, Macquarie University, NSW 2109, Australia, and Anglo-Australian Observatory, PO Box 296, Epping NSW 1710, Australia Received 8 February 2005 / Accepted 28 September 2005 ABSTRACT We present results of our wide-field redshift survey of galaxies in a 285 square degree region of the Shapley Supercluster (SSC), based on a set of 10 529 velocity measurements (including 1201 new ones) on 8632 galaxies obtained from various telescopes and from the literature. Our data reveal that the main plane of the SSC (v ≈ 14 500 km s−1) extends further than previous estimates, filling the whole extent of our survey region of 12 degrees by 30 degrees on the sky (30 × 75 h−1 Mpc).
    [Show full text]