Galaxy Evolution Explorer Ultraviolet Color-Magnitude Relations and Evidence of Recent Star Formation in Early-Type Galaxies
| Autor: | Chang H. Ree, Peter G. Friedman, Patrick N. Jelinsky, Y. W. Lee, Tom A. Barlow, Alexander S. Szalay, R. M. Rich, Y. I. Byun, Ted K. Wyder, Sug Whan Kim, Patrick Morrissey, Jose Donas, O. H. W. Siegmund, J. Rhee, Soo-Chang Rey, B. Milliard, Suk-Jin Yoon, Sugata Kaviraj, D. C. Martin, A. Boselli, Timothy M. Heckman, David Schiminovich, Myungkook J. Jee, Barry Y. Welsh, Luciana Bianchi, Young-Jong Sohn, T. Small, Samir Salim, Susan G. Neff, K. Forster, B. F. Madore, Roger F. Malina, Jae Woo Lee, S. Yi, J. M. Deharveng |
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| Rok vydání: | 2005 |
| Předmět: |
Physics
Stellar mass 010308 nuclear & particles physics Star formation Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Billion years Galaxy Lower limit Early type Space and Planetary Science 0103 physical sciences Magnitude (astronomy) Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 619:L111-L114 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | We have used the GALEX UV photometric data to construct a first near-ultraviolet (NUV) color-magnitude relation (CMR) for the galaxies pre-classified as early-type by SDSS 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 restframe 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 (< 1Gyr) 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. |
| Databáze: | OpenAIRE |
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