Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/27958
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Wu, Po-Feng | en_US |
dc.contributor.author | VAN DER WEL, ARJEN | en_US |
dc.contributor.author | GALLAZZI, Anna Rita | en_US |
dc.contributor.author | Bezanson, Rachel | en_US |
dc.contributor.author | Pacifici, Camilla | en_US |
dc.contributor.author | Straatman, Caroline | en_US |
dc.contributor.author | Franx, Marijn | en_US |
dc.contributor.author | Barišić, Ivana | en_US |
dc.contributor.author | Bell, Eric F. | en_US |
dc.contributor.author | Brammer, Gabriel B. | en_US |
dc.contributor.author | Calhau, Joao | en_US |
dc.contributor.author | Chauke, Priscilla | en_US |
dc.contributor.author | van Houdt, Josha | en_US |
dc.contributor.author | Maseda, Michael V. | en_US |
dc.contributor.author | Muzzin, Adam | en_US |
dc.contributor.author | Rix, Hans-Walter | en_US |
dc.contributor.author | Sobral, David | en_US |
dc.contributor.author | Spilker, Justin | en_US |
dc.contributor.author | van de Sande, Jesse | en_US |
dc.contributor.author | van Dokkum, Pieter | en_US |
dc.contributor.author | Wild, Vivienne | en_US |
dc.date.accessioned | 2020-10-23T12:14:35Z | - |
dc.date.available | 2020-10-23T12:14:35Z | - |
dc.date.issued | 2018 | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/27958 | - |
dc.description.abstract | Drawing from the LEGA-C data set, we present the spectroscopic view of the stellar population across a large volume- and mass-selected sample of galaxies at large look-back time. We measure the 4000 Å break (D<SUB> n </SUB>4000) and Balmer absorption line strengths (probed by Hδ) from 1019 high-quality spectra of z = 0.6-1.0 galaxies with M <SUB>*</SUB> = 2 × 10<SUP>10</SUP> M <SUB>☉</SUB> to 3 × 10<SUP>11</SUP> M <SUB>☉</SUB>. Our analysis serves as a first illustration of the power of high-resolution, high signal-to-noise ratio continuum spectroscopy at intermediate redshifts as a qualitatively new tool to constrain galaxy formation models. The observed D<SUB> n </SUB>4000-EW(Hδ) distribution of our sample overlaps with the distribution traced by present-day galaxies, but z ̃ 0.8 galaxies populate that locus in a fundamentally different manner. While old galaxies dominate the present-day population at all stellar masses >2 × 10<SUP>10</SUP> M <SUB>☉</SUB>, we see a bimodal D<SUB> n </SUB>4000-EW(Hδ) distribution at z ̃ 0.8, implying a bimodal light-weighted age distribution. The light-weighted age depends strongly on stellar mass, with the most massive galaxies >1 × 10<SUP>11</SUP> M <SUB>☉</SUB> being almost all older than 2 Gyr. At the same time, we estimate that galaxies in this high-mass range are only ̃3 Gyr younger than their z ̃ 0.1 counterparts, at odds with purely passive evolution given a difference in look-back time of >5 Gyr; younger galaxies must grow to >10<SUP>11</SUP> M <SUB>☉</SUB> in the meantime, or small amounts of young stars must keep the light-weighted ages young. Star-forming galaxies at z ̃ 0.8 have stronger Hδ absorption than present-day galaxies with the same D<SUB> n </SUB>4000, implying larger short-term variations in star formation activity. | en_US |
dc.language.iso | eng | en_US |
dc.title | Stellar Populations of over 1000 z ̃ 0.8 Galaxies from LEGA-C: Ages and Star Formation Histories from D n 4000 and Hδ | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.3847/1538-4357/aab0a6 | en_US |
dc.identifier.scopus | 2-s2.0-85044045343 | en_US |
dc.identifier.isi | 000427362600001 | en_US |
dc.identifier.url | https://iopscience.iop.org/article/10.3847/1538-4357/aab0a6 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 855 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 85 | en_US |
dc.type.referee | REF_1 | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | THE ASTROPHYSICAL JOURNAL | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2018ApJ...855...85W | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Arcetri | - |
crisitem.author.orcid | 0000-0002-9656-1800 | - |
crisitem.journal.journalissn | 0004-637X | - |
crisitem.journal.ance | E016252 | - |
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