Galaxy And Mass Assembly (GAMA): Timescales for galaxies crossing the green valley
| Autor: | Lee S. Kelvin, Steven Phillipps, Edward N. Taylor, Anne E. Sansom, Michelle E. Cluver, Simon P. Driver, Andrew M. Hopkins, Phil A. James, Malcolm N. Bremer, Luke J. M. Davies, Benne W. Holwerda, R. De Propris, Stephen Anthony Eales |
|---|---|
| Přispěvatelé: | University of St Andrews. School of Physics and Astronomy |
| Rok vydání: | 2019 |
| Předmět: |
galaxies structure
Stellar population Epoch (astronomy) structure [Galaxies] Population NDAS FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics stellar content star formation [Galaxies] 01 natural sciences star formation 0103 physical sciences QB Astronomy Astrophysics::Solar and Stellar Astrophysics education 010303 astronomy & astrophysics QC Astrophysics::Galaxy Astrophysics QB Physics F990 education.field_of_study 010308 nuclear & particles physics Star formation Astronomy and Astrophysics evolution [Galaxies] Astrophysics - Astrophysics of Galaxies galaxies evolution Galaxy QC Physics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) stellar content [Galaxies] Astrophysics::Earth and Planetary Astrophysics Event (particle physics) |
| Zdroj: | Phillipps, S, Bremer, M, Hopkins, A, De Propris, R, Taylor, E N, James, P A, Davies, L J M, Cluver, M E, Driver, S P, Eales, S A, Holwerda, B W, Kelvin, L S & Sansom, A E 2019, ' Galaxy And Mass Assembly (GAMA) : Timescales for galaxies crossing the green valley ', Monthly Notices of the Royal Astronomical Society, vol. 485, no. 4, stz799 . https://doi.org/10.1093/mnras/stz799 |
| ISSN: | 0035-8711 |
| DOI: | 10.48550/arxiv.1903.07675 |
| Popis: | We explore the constraints that can be placed on the evolutionary timescales for typical low redshift galaxies evolving from the blue cloud through the green valley and onto the red sequence. We utilise galaxies from the GAMA survey with 0.1 < z < 0.2 and classify them according to the intrinsic (u-r?) colours of their stellar populations, as determined by fits to their multi-wavelength spectral energy distributions. Using these fits to also determine stellar population ages and star formation timescales, we argue that our results are consistent with a green valley population dominated by galaxies that are simply decreasing their star formation (running out of gas) over a timescale of 2-4 Gyr which are seen at a specific epoch in their evolution (approximately 1.6 e-folding times after their peak in star formation). If their fitted star formation histories are extrapolated forwards, the green galaxies will further redden over time, until they attain the colours of a passive population. In this picture, no specific quenching event which cuts-off their star formation is required, though it remains possible that the decline in star formation in green galaxies may be expedited by internal or external forces. However, there is no evidence that green galaxies have recently changed their star formation timescales relative to their previous longer term star formation histories. MNRAS, accepted |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|