Schiminovich, David and Wyder, Ted K. and Martin, D. Christopher and Johnson , Benjamin D. and Salim, Samir and Seibert, Mark and Treyer, Marie A. and Budavári, Tamás and Hoopes, Charles and Zamojski, Michel and Barlow, Tom A. and Forster, Karl and Friedman, Peter G. and Morrissey, Patrick and Neff, Susan G. and Small, Todd A. and Bianchi, Luciana and Donas, José and Heckman, Timothy M. and Lee, Young-Wook and Madore, Barry F. and Milliard, Bruno and Rich, R. Michael and Szalay, Alex. S. and Welsh, Barry Y. and Yi, Sukyoung (2007) The UV-Optical Color Magnitude Diagram. II. Physical Properties and Morphological Evolution On and Off of a Star-forming Sequence. Astrophysical Journal Supplement Series, 173 (2). pp. 315-341. ISSN 0067-0049 http://resolver.caltech.edu/CaltechAUTHORS:20100222-095205221
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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, Σ_(SFR), 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 Σ_(SFR) 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.
|Additional Information:||© 2007 American Astronomical Society. Print publication: Issue 2 (2007 December); received 2007 August 2; accepted for publication 2007 October 16. D. S. gratefully acknowledges discussions with Eric Bell and Michael Blanton and the hospitality of the Max Planck Institut fu¨r Astronomie in Heidelberg and the Aspen Center for Physics. This work has made extensive use of the idlutils, kcorrect, and Goddard IDL libraries, as well as the MPA/JHU and the NYU SDSS value-added catalogs. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in April 2003. We gratefully acknowledge NASA’s support for the construction, operation, and science analysis for the GALEX mission, developed in cooperation with the Centre National d’Etudes Spatiales of France and the Korean Ministry of Science and Technology. Facilities: GALEX|
|Subject Keywords:||galaxies: evolution; galaxies: formation; surveys; ultraviolet: galaxies|
|Official Citation:||The UV-Optical Color Magnitude Diagram. II. Physical Properties and Morphological Evolution On and Off of a Star-forming Sequence David Schiminovich, Ted K. Wyder, D. Christopher Martin, Benjamin. D. Johnson, Samir Salim, Mark Seibert, Marie A. Treyer, Tamás Budavári, Charles Hoopes, Michel Zamojski, Tom A. Barlow, Karl G. Forster, Peter G. Friedman, Patrick Morrissey, Susan G. Neff, Todd A. Small, Luciana Bianchi, José Donas, Timothy M. Heckman, Young-Wook Lee, Barry F. Madore, Bruno Milliard, R. Michael Rich, Alex. S. Szalay, Barry Y. Welsh, and Sukyoung Yi 2007 ApJS 173 315-341 doi: 10.1086/524659|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||22 Feb 2010 21:17|
|Last Modified:||04 Mar 2013 17:53|
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