Luminosity-dependent star formation history of S0 galaxies: evidence from GALEX–SDSS–2MASS–WISE colours
| Autor: | Yogesh Wadadekar, Sudhanshu Barway, Kaustubh Vaghmare, Ajit K. Kembhavi |
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| Rok vydání: | 2013 |
| Předmět: |
Luminous infrared galaxy
Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Surface brightness fluctuation FOS: Physical sciences Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Peculiar galaxy Space and Planetary Science Bulge Elliptical galaxy Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Disc Lenticular galaxy Astrophysics::Galaxy Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics Luminosity function (astronomy) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 432:430-437 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stt478 |
| Popis: | We combine UV/Optical/near-IR/mid-IR data on a sample of ~240 S0 galaxies to examine various star formation related processes in them. We split the sample into bright and faint S0 galaxies based on their K band luminosity. Comparing the FUV-NUV versus NUV-K color-color diagram with a Simple Stellar Population (SSP) model shows that ellipticals and bright S0 galaxies are dominated by a stellar population of age > 10^9 years while faint S0 galaxies may contain stars as young as 10^8 years, providing evidence for relatively recent star formation activity. The strength of the 4000A break is also systematically higher in brighter S0 galaxies, again indicating the presence of an old stellar population. Their mid-IR colours indicate that bright S0 colours are like those of ellipticals while faint S0 colours are more like spirals. All these observations are consistent with a scenario in which low-luminosity S0 galaxies likely formed by the stripping of gas from the discs of late-type spiral galaxies, which in turn formed their pseudo bulges through secular evolution processes, possibly involving multiple episodes of star formation. On the other hand, more luminous S0 galaxies likely formed the bulk of their stars at early epochs, similar to the star formation in elliptical galaxies, and are characterised by an old coeval stellar population and classical bulge Accepted for publication in MNRAS: 9 pages, 8 figures |
| Databáze: | OpenAIRE |
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