Evolution histories of massive galaxies at z∼2 over the past 3 Gyr
| Autor: | Tommaso Treu, G. B. Brammer, T. Morishita, Patrick L. Kelly, Tucker Jones, Michele Trenti, Massimo Stiavelli, Benedetta Vulcani, Louis E. Abramson, Xin Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 010303 astronomy & astrophysics 01 natural sciences Astrophysics::Galaxy Astrophysics Galaxy 0105 earth and related environmental sciences |
| Zdroj: | Proceedings of the International Astronomical Union. 15:50-54 |
| ISSN: | 1743-9221 1743-9213 |
| DOI: | 10.1017/s1743921319002734 |
| Popis: | We study star formation and metallicity enrichment histories of 24 massive galaxies at 1.6 < z < 2.5. Deep slitless spectroscopy + imaging data set collected from multiple HST surveys allows robust determination of their SEDs. Our new SED modeling with no functional assumptions on star formation histories revels that 1. most of the sample galaxies have already formed >50% of their extant masses ∼1.5 Gyr before the time of observed redshifts, with a trend where more massive galaxies form earlier, 2. most of our galaxies already have stellar metallicities compatible with those of local early-type galaxies, and 3. inferred metallicities are on average ∼ 0.25 dex higher than observed gas-phase metallicities of star forming galaxies at the time of their formation. Continuation of low-level star formation, rather than abrupt termination of star forming activity, may explain the observed gap of metallicities. |
| Databáze: | OpenAIRE |
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