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A detailed look at the stellar populations in green valley galaxies
| Content Provider | Semantic Scholar |
|---|---|
| Author | Angthopo, James Ferreras, Ignacio Durán Silk, Joseph |
| Copyright Year | 2020 |
| Abstract | The green valley (GV) represents an important transitional state from actively starforming galaxies to passively evolving systems. Its traditional definition, based on colour, rests on a number of assumptions that can be subject to non-trivial systematics. In Angthopo et al. (2019), we proposed a new definition of the GV based on the 4000Å break strength. In this paper, we explore in detail the properties of the underlying stellar populations by use of ∼230 thousand high-quality spectra from the Sloan Digital Sky Survey (SDSS), contrasting our results with a traditional approach via dustcorrected colours. We explore high quality stacked SDSS spectra, and find a population trend that suggests a substantial difference between lowand high-mass galaxies, with the former featuring younger populations with star formation quenching, and the latter showing older (post-quenching) populations that include rejuvenation events. Subtle but measurable differences are found between a colour-based approach and our definition, especially as our selection of GV galaxies produces a cleaner “stratification” of the GV, with more homogeneous population properties within sections of the GV. Our definition based on 4000Å break strength gives a clean representation of the transition to quiescence, easily measurable in the upcoming and future spectroscopic surveys. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://arxiv.org/pdf/2005.03024v1.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
