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Uv-optical Colors as Probes of Early-type Galaxy Evolution
| Content Provider | Semantic Scholar |
|---|---|
| Author | Kaviraj, Sugata Schawinski, Kevin Devriendt, Julien E. G. T. Khochfar, Sadegh Yoon, S.-J. Yi, Sukyoung Ken Deharveng, J. M. Boselli Barlow, Tom Conrow, Tim Forster, Ken M. Friedman, Peter G. Martin, David C. Morrissey, Pangborn Neff, Samuel Schiminovich Seibert, Mark Small, Tameka Wyder, Ted K. Bianchi, Livio Donas, José Heckman, Tim Lee, Y. W. Madore, Bruno Milliard, B. Rich, R. Michael Szalay, Alex S. |
| Copyright Year | 2006 |
| Abstract | We have studied ∼ 2100 early-type galaxies in the SDSS DR3 which have been detected by the GALEX Medium Imaging Survey (MIS), in the redshift range 0 < z < 0.11. Combining GALEX UV photometry with corollary optical data from the SDSS, we find that, at a 95 percent confidence level, at least ∼ 30 percent of galaxies in this sample have UV to optical colours consistent with some recent star formation within the last Gyr. In particular, galaxies with a NUV − r colour less than 5.5 are very likely to have experienced such recent star formation, taking into account the possibility of a contribution to NUV flux from the UV upturn phenomenon. We find quantitative agreement between the observations and the predictions of a semi-analytical ΛCDM hierarchical merger model and deduce that early-type galaxies in the redshift range 0 < z < 0.11 have ∼ 1 to 3 percent of their stellar mass in stars less than 1 Gyr old. The average age of this recently formed population is ∼ 300 to 500 Myrs. We also find that ‘monolithically’ evolving galaxies, where recent star formation can be driven solely by recycled gas from stellar mass loss, cannot exhibit the blue colours (NUV − r < 5.5) seen in a significant fraction (∼ 30 percent) of our observed sample. Subject headings: galaxies: elliptical and lenticular, cD – galaxies: evolution – galaxies: formation – galaxies: fundamental parameters |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0601029v2.pdf |
| Alternate Webpage(s) | http://www.asu.edu/clas/hst/classes/ast591f08/rutkowski.UVEarlyTypes.pdf |
| Alternate Webpage(s) | http://authors.library.caltech.edu/17552/1/KAVapjss07.pdf |
| Alternate Webpage(s) | https://uhra.herts.ac.uk/bitstream/handle/2299/11922/906564.pdf;jsessionid=9219379F4474C049E3E0FB1F20B762C6?sequence=2 |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0601029v1.pdf |
| Alternate Webpage(s) | http://uhra.herts.ac.uk/bitstream/handle/2299/11922/906564.pdf?sequence=2 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Biological Evolution Color Flux qubit GUCY2C protein, human Galaxy Lenticular printing Magnetic Resonance Imaging Medical Subject Headings Photometry Recycling Redshift Semiconductor industry Sensorineural Hearing Loss (disorder) Spatial decision support system Star Wars Galaxies Stars, Celestial Stellar (payment network) |
| Content Type | Text |
| Resource Type | Article |
