Evolution in the Halo Masses of Isolated Galaxies between z~1 and z~0: From DEEP2 to SDSS

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dc.creatorConroy, Charlie
dc.creatorPrada, Francisco
dc.creatorNewman, Jeffrey A.
dc.creatorCroton, Darren
dc.creatorCoil, Alison L.
dc.creatorConselice, Christopher J.
dc.creatorCooper, Michael C.
dc.creatorDavis, Marc
dc.creatorFaber, S. M.
dc.creatorGerke, Brian F.
dc.creatorGuhathakurta, Puragra
dc.creatorKlypin, Anatoly
dc.creatorKoo, David C.
dc.creatorYan, Renbin
dc.date2006-07-11
dc.date.accessioned2026-07-07T10:39:32Z
dc.date.available2026-07-07T10:39:32Z
dc.descriptionWe measure the evolution in the virial mass-to-light ratio (M_{200}/L_B) and virial-to-stellar mass ratio (M_{200}/M_\ast) for isolated ~ L* galaxies between z~1 and z~0 by combining data from the DEEP2 Galaxy Redshift Survey and the Sloan Digital Sky Survey. Utilizing the motions of satellite galaxies around isolated galaxies, we measure line-of-sight velocity dispersions and derive dark matter halo virial masses for these host galaxies. At both epochs the velocity dispersion of satellites correlates with host galaxy stellar mass, σ\propto M_\ast^{0.4+/-0.1}, while the relation between satellite velocity dispersion and host galaxy B-band luminosity may grow somewhat shallower from σ\propto L_B^{0.6+/-0.1} at z~1 to σ\propto L_B^{0.4+/-0.1} at z~0. The evolution in M_200/M_\ast from z~1 to z~0 displays a bimodality insofar as host galaxies with stellar mass below M_\ast ~10^{11} M_Sun/h maintain a constant ratio (the intrinsic increase is constrained to a factor of 1.1+/-0.7) while host galaxies above M_\ast ~10^{11} M_Sun/h experience a factor of 4+/-3 increase in their virial-to-stellar mass ratio. This result can be easily understood if galaxies below this stellar mass scale continue to form stars while star formation in galaxies above this scale is quenched and the dark matter halos of galaxies both above and below this scale grow in accordance with LCDM cosmological simulations. Host galaxies that are red in U-B color have larger satellite dispersions and hence reside on average in more massive halos than blue galaxies at both z~1 and z~0. The redshift and host galaxy stellar mass dependence of M_200/M_\ast agrees qualitatively with the Millennium Run semi-analytic model of galaxy formation. (ABRIDGED)
dc.description20 pages, 8 figures, submitted to ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0607204
dc.identifierhttp://arxiv.org/abs/astro-ph/0607204
dc.identifierAstrophys.J.654:153-171,2006
dc.identifierdoi:10.1086/509632
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181060
dc.subjectAstrophysics
dc.titleEvolution in the Halo Masses of Isolated Galaxies between z~1 and z~0: From DEEP2 to SDSS
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