Galaxy evolution explorer ultraviolet color-magnitude relations and evidence of recent star formation in early-type galaxies

S. K. Yi, S. J. Yoon, S. Kaviraj, J. M. Deharveng, R. M. Rich, S. Salim, A. Boselli, Y. W. Lee, C. H. Ree, Y. J. Sohn, S. C. Rey, J. W. Lee, J. Rhee, L. Bianchi, Y. I. Byun, J. Donas, P. G. Friedman, T. M. Heckman, P. Jelinsky, B. F. MadoreR. Malina, D. C. Martin, B. Milliard, P. Morrissey, S. Neff, D. Schiminovich, O. Siegmund, T. Small, A. S. Szalay, M. J. Jee, S. W. Kim, T. Barlow, K. Forster, B. Welsh, T. K. Wyder

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Abstract

We have used the Galaxy Evolution Explorer UV photometric data to construct a first near-UV (NUV) color-magnitude relation (CMR) for the galaxies preclassified as early-type by Sloan Digital Sky Survey studies. The NUV CMR is a powerful tool for tracking the recent star formation history in early-type galaxies, owing to its high sensitivity to the presence of young stellar populations. Our NUV CMR for UV-weak galaxies shows a well-defined slope and thus will be useful for interpreting the rest-frame NUV data of distant galaxies and studying their star formation history. Compared to optical CMRs, the NUV CMR shows a substantially larger scatter, which we interpret as evidence of recent star formation activities. Roughly 15% of the recent epoch (z < 0.13) bright [M(r) < -22] early-type galaxies show a sign of recent ≤1 Gyr) star formation at the 1%-2% level (lower limit) in mass compared to the total stellar mass. This implies that low-level residual star formation was common during the last few billion years even in bright early-type galaxies.

Original languageEnglish
Pages (from-to)L111-L114
JournalAstrophysical Journal
Volume619
Issue number1 II
DOIs
Publication statusPublished - 2005 Jan 20

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Yi, S. K., Yoon, S. J., Kaviraj, S., Deharveng, J. M., Rich, R. M., Salim, S., Boselli, A., Lee, Y. W., Ree, C. H., Sohn, Y. J., Rey, S. C., Lee, J. W., Rhee, J., Bianchi, L., Byun, Y. I., Donas, J., Friedman, P. G., Heckman, T. M., Jelinsky, P., ... Wyder, T. K. (2005). Galaxy evolution explorer ultraviolet color-magnitude relations and evidence of recent star formation in early-type galaxies. Astrophysical Journal, 619(1 II), L111-L114. https://doi.org/10.1086/422811