TY - JOUR
T1 - The UV-optical color magnitude diagram. II. Physical properties and morphological evolution on and off of a star-forming sequence
AU - Schiminovich, David
AU - Wyder, Ted K.
AU - Martin, D. Christopher
AU - Johnson, Benjamin D.
AU - Salim, Samir
AU - Seibert, Mark
AU - Treyer, Marie A.
AU - Budavári, Tamás
AU - Hoopes, Charles
AU - Zamojski, Michel
AU - Barlow, Tom A.
AU - Forster, Karl G.
AU - Friedman, Peter G.
AU - Morrissey, Patrick
AU - Neff, Susan G.
AU - Small, Todd A.
AU - Bianchi, Luciana
AU - Donas, José
AU - Heckman, Timothy M.
AU - Lee, Young Wook
AU - Madore, Barry F.
AU - Milliard, Bruno
AU - Rich, R. Michael
AU - Szalay, Alex S.
AU - Welsh, Barry Y.
AU - Yi, Sukyoung
PY - 2007/12
Y1 - 2007/12
N2 - We use the UV-optical color magnitude diagram in combination with spectroscopic and photometric measurements derived from the SDSS spectroscopic sample to measure the distribution of galaxies in the local universe (z < 0.25) and their physical properties as a function of specific star formation rate (SFR/M*) and stellar mass (M*). Throughout this study our emphasis is on the properties of galaxies on and off of a local "star-forming sequence." We discuss how the physical characteristics of galaxies along this sequence are related to scaling relations typically derived for galaxies of different morphological types. We find, among other trends, that our measure of the star formation rate surface density, ΣSFR, is nearly constant along this sequence. We discuss this result and implications for galaxies at higher redshift. For the first time, we report on measurements of the local UV luminosity function versus galaxy structural parameters, as well as inclination. We also split our sample into disk-dominated and bulge-dominated subsamples using the i-band Sersic index and find that disk-dominated galaxies occupy a very tight locus in SFR/M * vs. M* space, while bulge-dominated galaxies display a much larger spread of SFR/M*, at fixed stellar mass. A significant fraction of galaxies with SFR/M* and ΣSFR above those on the "star-forming sequence" are bulge-dominated. We can use our derived distribution functions to ask whether a significant fraction of these galaxies may be experiencing a final episode of star formation (possibly induced by a merger or other burst), soon to be quenched, by determining whether this population can explain the growth rate of the non-star-forming galaxies on the "red sequence." We find that this is a plausible scenario for bulge-dominated galaxies near the characteristic transition mass under reasonable assumptions regarding quenching timescales. Similarly, we use this technique to estimate the rate of mergers/starbursts that take galaxies off of the star-forming sequence and show that the implied merger rates are consistent with local measurements.
AB - We use the UV-optical color magnitude diagram in combination with spectroscopic and photometric measurements derived from the SDSS spectroscopic sample to measure the distribution of galaxies in the local universe (z < 0.25) and their physical properties as a function of specific star formation rate (SFR/M*) and stellar mass (M*). Throughout this study our emphasis is on the properties of galaxies on and off of a local "star-forming sequence." We discuss how the physical characteristics of galaxies along this sequence are related to scaling relations typically derived for galaxies of different morphological types. We find, among other trends, that our measure of the star formation rate surface density, ΣSFR, is nearly constant along this sequence. We discuss this result and implications for galaxies at higher redshift. For the first time, we report on measurements of the local UV luminosity function versus galaxy structural parameters, as well as inclination. We also split our sample into disk-dominated and bulge-dominated subsamples using the i-band Sersic index and find that disk-dominated galaxies occupy a very tight locus in SFR/M * vs. M* space, while bulge-dominated galaxies display a much larger spread of SFR/M*, at fixed stellar mass. A significant fraction of galaxies with SFR/M* and ΣSFR above those on the "star-forming sequence" are bulge-dominated. We can use our derived distribution functions to ask whether a significant fraction of these galaxies may be experiencing a final episode of star formation (possibly induced by a merger or other burst), soon to be quenched, by determining whether this population can explain the growth rate of the non-star-forming galaxies on the "red sequence." We find that this is a plausible scenario for bulge-dominated galaxies near the characteristic transition mass under reasonable assumptions regarding quenching timescales. Similarly, we use this technique to estimate the rate of mergers/starbursts that take galaxies off of the star-forming sequence and show that the implied merger rates are consistent with local measurements.
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U2 - 10.1086/524659
DO - 10.1086/524659
M3 - Article
AN - SCOPUS:39449129331
VL - 173
SP - 315
EP - 341
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
SN - 0067-0049
IS - 2
ER -