H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES
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...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/93131 |
| _version_ | 1826191351330373632 |
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| author | Garcia-Appadoo, Diego A. Dalcanton, Julianne J. Disney, Mike J. Rockosi, Constance M. Ivezic, Zeljko West, A. A. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Garcia-Appadoo, Diego A. Dalcanton, Julianne J. Disney, Mike J. Rockosi, Constance M. Ivezic, Zeljko West, A. A. |
| author_sort | Garcia-Appadoo, Diego A. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T08:54:33Z |
| format | Article |
| id | mit-1721.1/93131 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:54:33Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/931312022-09-26T09:05:33Z H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES Garcia-Appadoo, Diego A. Dalcanton, Julianne J. Disney, Mike J. Rockosi, Constance M. Ivezic, Zeljko West, A. A. MIT Kavli Institute for Astrophysics and Space Research West, Andrew A. 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. National Science Foundation (U.S.) (Grant 0540567) University of Washington. Royalty Research Fund ADVANCE Astronaut Scholarship Foundation 2015-01-22T17:20:17Z 2015-01-22T17:20:17Z 2009-07 2009-01 Article http://purl.org/eprint/type/JournalArticle 0004-6256 1538-3881 http://hdl.handle.net/1721.1/93131 West, Andrew A., Diego A. Garcia-Appadoo, Julianne J. Dalcanton, Mike J. Disney, Constance M. Rockosi, and Zeljko Ivezic. “H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES.” The Astronomical Journal 138, no. 3 (September 1, 2009): 796–807. © 2009 The American Astronomical Society en_US http://dx.doi.org/10.1088/0004-6256/138/3/796 The Astronomical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Garcia-Appadoo, Diego A. Dalcanton, Julianne J. Disney, Mike J. Rockosi, Constance M. Ivezic, Zeljko West, A. A. H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES |
| title | H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES |
| title_full | H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES |
| title_fullStr | H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES |
| title_full_unstemmed | H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES |
| title_short | H I-SELECTED GALAXIES IN THE SLOAN DIGITAL SKY SURVEY. II. THE COLORS OF GAS-RICH GALAXIES |
| title_sort | h i selected galaxies in the sloan digital sky survey ii the colors of gas rich galaxies |
| url | http://hdl.handle.net/1721.1/93131 |
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