Publication:
Interpreting the relationship between galaxy luminosity, color, and environment

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dc.contributor.authorBerlind, AA
dc.contributor.authorBlanton, MR
dc.contributor.authorHogg, DW
dc.contributor.authorWeinberg, DH
dc.contributor.authorDave, R
dc.contributor.authorEisenstein, DJ
dc.contributor.authorKatz, N
dc.contributor.departmentUniversity of Massachusetts - Amherst
dc.date2023-09-22T23:45:42.000
dc.date.accessioned2024-04-26T08:27:40Z
dc.date.available2024-04-26T08:27:40Z
dc.date.issued2005-01-01
dc.description<p>This is the pre-published version harvested from ArXiv. The published version is located at <a href="http://iopscience.iop.org/0004-637X/629/2/625/">http://iopscience.iop.org/0004-637X/629/2/625/</a></p>
dc.description.abstractWe study the relationship between galaxy luminosity, color, and environment in a cosmological simulation of galaxy formation. Using a simple prescription to assign colors and luminosities to simulated galaxies, we compare the predicted relationship with that observed for SDSS galaxies and find that the model successfully predicts most of the qualitative features seen in the data, but also shows some interesting differences. Specifically, the simulation predicts that the local density around bright red galaxies is a strong increasing function of luminosity, but does not depend much on color at fixed luminosity. Moreover, we show that these trends are due to central galaxies in dark matter halos whose baryonic masses correlate strongly with halo mass. The simulation also predicts that the local density around blue galaxies is a strong increasing function of color, but does not depend much on luminosity at fixed color. We show that these trends are due to satellite galaxies in halos whose stellar ages correlate with halo mass. Finally, the simulation fails to predict the luminosity dependence of environments observed around low-luminosity red galaxies. However, we show that this is most likely due to the simulation's limited resolution. A study of a higher resolution, smaller volume simulation suggests that this dependence is caused by the fact that all low-luminosity red galaxies are satellites in massive halos, whereas intermediate-luminosity red galaxies are a mixture of satellites in massive halos, and central galaxies in less massive halos.
dc.description.pages625-632
dc.identifier.doihttps://doi.org/10.1086/431658
dc.identifier.urihttps://hdl.handle.net/20.500.14394/2997
dc.relation.ispartofASTROPHYSICAL JOURNAL
dc.relation.urlhttps://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1325&amp;context=astro_faculty_pubs&amp;unstamped=1
dc.source.issue2
dc.source.issue629
dc.source.statuspublished
dc.subjectcosmology : theory
dc.subjectgalaxies : formation
dc.subjectlarge-scale structure of universe
dc.subjectAstrophysics and Astronomy
dc.titleInterpreting the relationship between galaxy luminosity, color, and environment
dc.typearticle
dc.typearticle
digcom.contributor.authorBerlind, AA
digcom.contributor.authorBlanton, MR
digcom.contributor.authorHogg, DW
digcom.contributor.authorWeinberg, DH
digcom.contributor.authorDave, R
digcom.contributor.authorEisenstein, DJ
digcom.contributor.authorisAuthorOfPublication|email:nsk@astro.umass.edu|institution:University of Massachusetts - Amherst|Katz, N
digcom.identifierastro_faculty_pubs/326
digcom.identifier.contextkey1683012
digcom.identifier.submissionpathastro_faculty_pubs/326
dspace.entity.typePublication
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