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Young stellar populations in early-type galaxies in the SDSS
| Content Provider | Scilit |
|---|---|
| Author | Nolan, Louisa A. Kabán, Ata Harva, Markus Benson, Andrew Raychaudhury, Somak |
| Copyright Year | 2007 |
| Description | We use a purely data-driven rectified factor analysis to identify early-type galaxies with young (≲ 4 Gyr) stellar populations in the Sloan Digital Sky Survey Spectroscopic Catalogue. We call these galaxies E+F galaxies, analogous to E+A galaxies. These galaxies lie in the ‘Green Valley’, between the blue cloud and the red sequence on the colour-magnitude diagram. As such, these galaxies may represent an important transient stage in the evolution of galaxies from blue and star-forming to red and passive. We investigate the distribution in projected local galaxy surface density of the E+F galaxies, and compare it with the environment of early-type and E+A galaxies. We find that i) the E+A distribution peaks strongly in projected local galaxy surface density, $Σ_{5}$, at ~ 0.1−0.2 $Mpc^{−2}$, ii) early-types have a flatter peak at ~ 0.06−0.2 Mpc−2, iii) the E+Fs lie somewhere in between, and iv) the distributions of the models do not agree well with the data, peaking at higher densities, and under-predicting the number of E+As at low $(Σ_{5}$ < 0.3 $Mpc^{−2}$) densities. The dearth of E+A and E+F galaxies in dense environments confirms that E+A and E+F galaxies are most likely the products of galaxy-galaxy merging or interactions, rather than star-forming galaxies whose star formation has been quenched by processes unique to dense environments, such as ram-pressure stripping or galaxy harassment. The similarity of the environments in which the E+F population and the E+A galaxy sample are found, together with the spectral evidence, suggests that E+F galaxies are E+A galaxies, which have evolved by a further ~ one to a few Gyr. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/816DEC26182ECC11F7B532CDD1016D10/S1743921308018206a.pdf/div-class-title-young-stellar-populations-in-early-type-galaxies-in-the-sdss-div.pdf |
| Ending Page | 394 |
| Page Count | 4 |
| Starting Page | 391 |
| ISSN | 17439213 |
| e-ISSN | 17439221 |
| DOI | 10.1017/s1743921308018206 |
| Journal | Proceedings of the International Astronomical Union |
| Issue Number | S245 |
| Volume Number | 3 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2007-07-01 |
| Access Restriction | Open |
| Subject Keyword | Proceedings of the International Astronomical Union Astronomy and Astrophysics Spectroscopic Elliptical and Lenticular Evolution Formation Stellar Content |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
