Luminous Satellites Ii: Spatial Distribution, Luminosity Function and Cosmic Evolution
نویسندگان
چکیده
We infer the normalization and the radial and angular distributions of the number density of satellites of massive galaxies (log10[M*h/M �] > 10.5) between redshifts 0.1 and 0.8 as a function of host stellar mass, redshift, morphology, and satellite luminosity. Exploiting the depth and resolution of the COSMOS Hubble Space Telescope images, we detect satellites up to 8 mag fainter than the host galaxies and as close as 0.3 (1.4) arcsec (kpc). Describing the number density profile of satellite galaxies to be a projected power law such that P(R)∝ Rp , wefindp = 1.1ś0.3.Wefindnodependencyofponhoststellarmass, redshift, morphology, orsatelliteluminosity.Satellitesofearly− typehostshaveangulardistributionsthataremoreflattenedthanthehostlightprofileandarealignedwithitsmajoraxis.Nosignificantaveragealignmentisdetectedforsatellitesoflate− typehosts.Thenumberofsatelliteswithinafixedmagnitudecontrastfromahostgalaxyisdependentonitsstellarmass, withmoremassivegalaxieshostingsignificantlymoresatellites.Furthermore, high− masslate−typehostshavesignificantlyfewersatellitesthanearly−typegalaxiesofthesamestellarmass, possiblyindicatingthattheyresideinmoremassivehalos.Nosignificantevolutioninthenumberofsatellitesperhostisdetected.ThecumulativeluminosityfunctionofsatellitesisqualitativelyingoodagreementwiththatpredictedusingSubHaloAbundanceMatchingtechniques.However, therearesignificantresidualdiscrepanciesintheabsolutenormalization, suggestingthatpropertiesotherthanthehostgalaxyluminosityorstellarmassdeterminethenumberofsatellites. DOI: https://doi.org/10.1088/0004-637X/752/2/99 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-70385 Originally published at: Nierenberg, A M; Auger, M W; Treu, T; Marshall, P J; Fassnacht, C D; Busha, M T (2012). Luminous satellites. II. Spatial distribution, luminosity function, and cosmic evolution. Astrophysical Journal, 752(2):99-118. DOI: https://doi.org/10.1088/0004-637X/752/2/99 ar X iv :1 20 2. 21 25 v2 [ as tr oph .G A ] 2 4 A pr 2 01 2 ———————————————————————— — Accepted for publication in ApJ Preprint typeset using LTEX style emulateapj v. 5/2/11 LUMINOUS SATELLITES II: SPATIAL DISTRIBUTION, LUMINOSITY FUNCTION AND COSMIC EVOLUTION A.M. Nierenberg, M.W. Auger, T. Treu, P.J. Marshall, C.D. Fassnacht, Michael T. Busha Accepted for publication in ApJ
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