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The UV-Optical Galaxy Color-Magnitude Diagram. III. Constraints on Evolution from the Blue to the Red Sequence

Martin, D. Christopher and Wyder, Ted K. and Schiminovich, David and Barlow, Tom A. and Forster, Karl and Friedman, Peter G. and Morrissey, Patrick and Neff, Susan G. and Seibert, Mark and Small, Todd and Welsh, Barry Y. 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 Yi, Sukyoung K. (2007) The UV-Optical Galaxy Color-Magnitude Diagram. III. Constraints on Evolution from the Blue to the Red Sequence. Astrophysical Journal Supplement Series, 173 (2). pp. 342-356. ISSN 0067-0049. doi:10.1086/516639.

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We introduce a new quantity, the mass flux density of galaxies evolving from the blue sequence to the red sequence. We propose a simple technique for constraining this mass flux using the volume-corrected number density in the extinction-corrected UV-optical color-magnitude distribution, the stellar age indexes Hδ_A and D_n(4000), and a simple prescription for spectral evolution using a quenched star formation history. We exploit the excellent separation of red and blue sequences in the NUV − r band Hess function. The final value we measure, ρ_T = 0.033 M_⊙ yr^(−1) Mpc^(−3), is strictly speaking an upper limit due to the possible contributions of bursting, composite, and extincted galaxies. However, it compares favorably with estimates of the average mass flux that we make based on the red luminosity function evolution derived from the DEEP2 and COMBO-17 surveys, ρ_R = +0.034 M_⊙ yr^(−1) Mpc^(−3). We find that the blue sequence mass has remained roughly constant since z = 1 (ρ_B ≃ 0.01 M_⊙ yr^(−1) Mpc^(−3)), but the average on-going star formation of ρ_(SF) ≃ 0.037 M_⊙ yr^(−1) Mpc^(−3) over 0 < z < 1 is balanced by mass flux off the blue sequence. We explore the nature of the galaxies in the transition zone with particular attention to the frequency and impact of active galactic nuclei (AGNs). The AGN fraction peaks in the transition zone. We find circumstantial, albeit weak evidence that the quench rates are higher in higher luminosity AGNs.

Item Type:Article
Related URLs:
URLURL TypeDescription
Martin, D. Christopher0000-0002-8650-1644
Forster, Karl0000-0001-5800-5531
Morrissey, Patrick0000-0001-8177-1023
Seibert, Mark0000-0002-1143-5515
Madore, Barry F.0000-0002-1576-1676
Rich, R. Michael0000-0003-0427-8387
Additional Information:© 2007 The American Astronomical Society. Received 2006 February 27; accepted 2006 June 18. GALEX (Galaxy Evolution Explorer) is a NASA Small Explorer, launched in 2003 April. We gratefully acknowledge NASA’s support for 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. We also thank the referee for excellent comments. Facilities: GALEX.
Group:Space Radiation Laboratory, Space Astrophysics Laboratory
Funding AgencyGrant Number
Subject Keywords:galaxies : evolution; ultraviolet : galaxies
Issue or Number:2
Record Number:CaltechAUTHORS:20100212-150837678
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Official Citation:The UV-Optical Galaxy Color-Magnitude Diagram. III. Constraints on Evolution from the Blue to the Red Sequence D. Christopher Martin, Ted K. Wyder, David Schiminovich, Tom A. Barlow, Karl Forster, Peter G. Friedman, Patrick Morrissey, Susan G. Neff, Mark Seibert, Todd Small, Barry Y. Welsh, Luciana Bianchi, José Donas, Timothy M. Heckman, Young-Wook Lee, Barry F. Madore, Bruno Milliard, R. Michael Rich, Alex S. Szalay, and Sukyoung K. Yi 2007 ApJS 173 342-356 doi: 10.1086/516639
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17473
Deposited By: Tony Diaz
Deposited On:16 Feb 2010 19:42
Last Modified:08 Nov 2021 23:36

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