Relation Between Stellar Mass and Star Formation Activity in Galaxies

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dc.creatorMobasher, Bahram
dc.creatorDahlen, T.
dc.creatorHopkins, A.
dc.creatorScoville, N. Z.
dc.creatorCapak, P.
dc.creatorRich, R. M.
dc.creatorSanders, D. B.
dc.creatorSchinnerer, Eva
dc.creatorIlbert, Olivier
dc.creatorSalvato, Mara
dc.creatorSheth, Kartik
dc.date2008-08-20
dc.date.accessioned2026-07-07T12:15:17Z
dc.date.available2026-07-07T12:15:17Z
dc.descriptionFor a mass-selected sample of 66544 galaxies with photometric redshifts from the Cosmic Evolution Survey (COSMOS), we examine the evolution of star formation activity as a function of stellar mass in galaxies. We estimate the cosmic star formation rates (SFR) over the range 0.2 < z < 1.2, using the rest-frame 2800 A flux (corrected for extinction). We find the mean SFR to be a strong function of the galactic stellar mass at any given redshift, with massive systems (log (M/M(Sun)) > 10.5) contributing less (by a factor of ~ 5) to the total star formation rate density (SFRD). Combining data from the COSMOS and Gemini Deep Deep Survey (GDDS), we extend the SFRD-z relation as a function of stellar mass to z~2. For massive galaxies, we find a steep increase in the SFRD-z relation to z~2; for the less massive systems, the SFRD which also increases from z=0 to 1, levels off at z~1. This implies that the massive systems have had their major star formation activity at earlier epochs (z > 2) than the lower mass galaxies. We study changes in the SFRDs as a function of both redshift and stellar mass for galaxies of different spectral types. We find that the slope of the SFRD-z relation for different spectral type of galaxies is a strong function of their stellar mass. For low and intermediate mass systems, the main contribution to the cosmic SFRD comes from the star-forming galaxies while, for more massive systems, the evolved galaxies are the most dominant population.
dc.description34 pages; 8 figures; Accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/0808.2746
dc.identifierhttp://arxiv.org/abs/0808.2746
dc.identifierAstrophys.J.690:1074-1083,2009
dc.identifierdoi:10.1088/0004-637X/690/2/1074
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211459
dc.subjectAstrophysics
dc.titleRelation Between Stellar Mass and Star Formation Activity in Galaxies
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