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Stellar populations of over one 1000 z ∼ 0.8 galaxies from LEGA-C : ages and star formation histories from Dn4000 and Hδ
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dc.contributor.author | Wu, Po-Feng | |
dc.contributor.author | van der Wel, Arjen | |
dc.contributor.author | Gallazzi, Anna | |
dc.contributor.author | Bezanson, Rachel | |
dc.contributor.author | Pacifici, Camilla | |
dc.contributor.author | Straatman, Caroline | |
dc.contributor.author | Franx, Marijn | |
dc.contributor.author | Barišić, Ivana | |
dc.contributor.author | Bell, Eric F. | |
dc.contributor.author | Brammer, Gabriel B. | |
dc.contributor.author | Calhau, Joao | |
dc.contributor.author | Chauke, Priscilla | |
dc.contributor.author | van Houdt, Josha | |
dc.contributor.author | Maseda, Michael V. | |
dc.contributor.author | Muzzin, Adam | |
dc.contributor.author | Rix, Hans-Walter | |
dc.contributor.author | Sobral, David | |
dc.contributor.author | Spilker, Justin | |
dc.contributor.author | van de Sande, Jesse | |
dc.contributor.author | van Dokkum, Pieter | |
dc.contributor.author | Wild, Vivienne | |
dc.date.accessioned | 2018-03-29T14:30:10Z | |
dc.date.available | 2018-03-29T14:30:10Z | |
dc.date.issued | 2018-03-12 | |
dc.identifier | 252394463 | |
dc.identifier | 29c0c5d9-fc69-49f1-9de8-eae2d31fcae0 | |
dc.identifier | 85044045343 | |
dc.identifier | 000427362600001 | |
dc.identifier.citation | Wu , P-F , van der Wel , A , Gallazzi , A , Bezanson , R , Pacifici , C , Straatman , C , Franx , M , Barišić , I , Bell , E F , Brammer , G B , Calhau , J , Chauke , P , van Houdt , J , Maseda , M V , Muzzin , A , Rix , H-W , Sobral , D , Spilker , J , van de Sande , J , van Dokkum , P & Wild , V 2018 , ' Stellar populations of over one 1000 z ∼ 0.8 galaxies from LEGA-C : ages and star formation histories from D n 4000 and Hδ ' , Astrophysical Journal , vol. 855 , no. 2 , 85 . https://doi.org/10.3847/1538-4357/aab0a6 | en |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | BibCode: 2018arXiv180206799W | |
dc.identifier.uri | https://hdl.handle.net/10023/13048 | |
dc.description | Funding: VW acknowledges funding from the ERC (starting grant SEDmorph, PI. Wild). | en |
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 4000Å break (Dn4000) and Balmer absorption line strengths (probed by Hδ) from 1019 high-quality spectra of z = 0.6−1.0 galaxies with M∗ = 2 x 1010M⊙−3×1011M⊙. Our analysis serves as a first illustration of the power of high-resolution, high-S/N continuum spectroscopy at intermediate redshifts as a qualitatively new tool to constrain galaxy formation models. The observed Dn4000-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 x 1010M⊙, we see a bimodal Dn4000-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 x 1011M⊙ 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 odd with pure passive evolution given a difference in lookback time of > 5 Gyr; younger galaxies must grow to > 1011M⊙ in the meantime, and/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 Dn4000, implying larger short-term variations in star-formation activity. | |
dc.format.extent | 1299914 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astrophysical Journal | en |
dc.subject | Galaxies: evolution | en |
dc.subject | Galaxies: high-redshift | en |
dc.subject | Galaxies: stellar content | en |
dc.subject | QB Astronomy | en |
dc.subject | QC Physics | en |
dc.subject | NDAS | en |
dc.subject.lcc | QB | en |
dc.subject.lcc | QC | en |
dc.title | Stellar populations of over one 1000 z ∼ 0.8 galaxies from LEGA-C : ages and star formation histories from Dn4000 and Hδ | en |
dc.type | Journal article | en |
dc.contributor.sponsor | European Research Council | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.identifier.doi | https://doi.org/10.3847/1538-4357/aab0a6 | |
dc.description.status | Peer reviewed | en |
dc.identifier.url | http://adsabs.harvard.edu/abs/2018arXiv180206799W | en |
dc.identifier.grantnumber | ERC-2012-StG-20111012 | en |
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