The dynamical state of galaxy groups and their luminosity content
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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| Data(s) |
05/11/2013
05/11/2013
2012
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| Resumo |
We analyse the dependence of the luminosity function (LF) of galaxies in groups on group dynamical state. We use the Gaussianity of the velocity distribution of galaxy members as a measurement of the dynamical equilibrium of groups identified in the Sloan Digital Sky Survey Data Release 7 by Zandivarez & Martinez. We apply the Anderson-Darling goodness-of-fit test to distinguish between groups according to whether they have Gaussian or non-Gaussian velocity distributions, i.e. whether they are relaxed or not. For these two subsamples, we compute the (0.1)r-band LF as a function of group virial mass and group total luminosity. For massive groups, , we find statistically significant differences between the LF of the two subsamples: the LFs of groups that have Gaussian velocity distributions have a brighter characteristic absolute magnitude (similar to 0.3 mag) and a steeper faint-end slope (similar to 0.25). We detect a similar effect when comparing the LF of bright [M-0.1r(group) - 5log(h) < -23.5] Gaussian and non-Gaussian groups. Our results indicate that, for massive/luminous groups, the dynamical state of the system is directly related to the luminosity of its galaxy members. Consejo Nacional de Investigaciones Cientificas y Tecnicas de la Republica Argentina (CONICET) Consejo Nacional de Investigaciones Cientificas y Tecnicas de la Republica Argentina (CONICET) [PIP2011/2013 11220100100336] Secretaria de Ciencia y Tecnologia de la Universidad de Cordoba, Argentina. (SeCyT) Secretaria de Ciencia y Tecnologia de la Universidad de Cordoba, Argentina. (SeCyT) Fundacao de Amparoa Pesquisa do Estado do Sao Paulo (FAPESP), Brazil Fundacao de Amparoa Pesquisa do Estado do Sao Paulo (FAPESP), Brazil Alfred P. Sloan Foundation Alfred P. Sloan Foundation Participating Institutions Participating Institutions National Science Foundation National Science Foundation US Department of Energy US Department of Energy National Aeronautics and Space Administration National Aeronautics and Space Administration Japanese Monbukagakusho Japanese Monbukagakusho Max Planck Society Max Planck Society Higher Education Funding Council for England Higher Education Funding Council for England American Museum of Natural History American Museum of Natural History Astrophysical Institute Potsdam Astrophysical Institute Potsdam University of Basel University of Basel University of Cambridge University of Cambridge Case Western Reserve University Case Western Reserve University University of Chicago University of Chicago Drexel University Drexel University Fermilab Fermilab Institute for Advanced Study Institute for Advanced Study Japan Participation Group Japan Participation Group Johns Hopkins University Johns Hopkins University Joint Institute for Nuclear Astrophysics Joint Institute for Nuclear Astrophysics Kavli Institute for Particle Astrophysics and Cosmology Kavli Institute for Particle Astrophysics and Cosmology Korean Scientist Group Korean Scientist Group Chinese Academy of Sciences (LAMOST) Chinese Academy of Sciences (LAMOST) Los Alamos National Laboratory Los Alamos National Laboratory MaxPlanckInstitute for Astronomy (MPIA) Max-Planck-Institute for Astronomy (MPIA) Max-Planck-Institute for Astrophysics (MPA) MaxPlanckInstitute for Astrophysics (MPA) New Mexico State University New Mexico State University Ohio State University Ohio State University University of Pittsburgh University of Pittsburgh University of Portsmouth University of Portsmouth Princeton University Princeton University United States Naval Observatory United States Naval Observatory University of Washington University of Washington |
| Identificador |
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, MALDEN, v. 419, n. 1, supl. 4, Part 1, pp. L24-L28, JAN, 2012 0035-8711 http://www.producao.usp.br/handle/BDPI/41453 10.1111/j.1745-3933.2011.01170.x |
| Idioma(s) |
eng |
| Publicador |
WILEY-BLACKWELL MALDEN |
| Relação |
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| Direitos |
closedAccess Copyright WILEY-BLACKWELL |
| Palavras-Chave | #GALAXIES: FUNDAMENTAL PARAMETERS #GALAXIES: GROUPS: GENERAL #GALAXIES: EVOLUTION #DIGITAL-SKY-SURVEY #REDSHIFT SURVEY #DATA RELEASE #VELOCITY DISPERSION #CLUSTER SURVEY #MASS #SEGREGATION #EVOLUTION #DENSITY #SDSS #ASTRONOMY & ASTROPHYSICS |
| Tipo |
article original article publishedVersion |
