期刊
ASTRONOMICAL JOURNAL
卷 138, 期 3, 页码 796-807出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/138/3/796
关键词
galaxies: evolution; galaxies: fundamental parameters; galaxies: general; galaxies: photometry; radio lines: galaxies; surveys
资金
- NSF [054056]
- Royalty Research Fund
- ADVANCE
- Astronaut Scholarship Foundation
- Wyckoff Faculty Fellowship
- Alfred P. Sloan Foundation
- National Science Foundation
- U. S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
We utilize color information for an H I-selected sample of 195 galaxies to explore the star formation histories and physical conditions that produce the observed colors. We show that the H I selection creates a significant offset toward bluer colors that can be explained by enhanced recent bursts of star formation. There is also no obvious color bimodality, because the H I selection restricts the sample to bluer, actively star-forming systems, diminishing the importance of the red sequence. Rising star formation rates are still required to explain the colors of galaxies bluer than g - r < 0.3. We also demonstrate that the colors of the bluest galaxies in our sample are dominated by emission lines and that stellar population synthesis models alone ( without emission lines) are not adequate for reproducing many of the galaxy colors. These emission lines produce large changes in the r - i colors but leave the g - r color largely unchanged. In addition, we find an increase in the dispersion of galaxy colors at low masses that may be the result of a change in the star formation process in low-mass galaxies.
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