https://scholars.lib.ntu.edu.tw/handle/123456789/624899
標題: | Ubiquitous [O II] Emission in Quiescent Galaxies at z ≈ 0.85 from the LEGA-C Survey | 作者: | Maseda M.V Van Der Wel A Franx M Bell E.F Bezanson R Muzzin A Sobral D D'Eugenio F Gallazzi A De Graaff A Leja J Straatman C Whitaker K.E Williams C.C Wu P.-F. PO-FENG WU |
公開日期: | 2021 | 卷: | 923 | 期: | 1 | 來源出版物: | Astrophysical Journal | 摘要: | Using deep rest-frame optical spectroscopy from the Large Early Galaxy Astrophysical Census (LEGA-C) survey, conducted using VIMOS on the ESO Very Large Telescope, we search for low-ionization [O ii] λ λ 3726,3729 emission in the spectra of a mass-complete sample of z ≈ 0.85 galaxies. We find that 59% of UVJ-quiescent (i.e., non-star-forming) galaxies in the sample have [O ii] emission detected above our completeness limit of 1.5 Å, and the median-stacked spectrum of the remaining sample also shows [O ii] emission. The overall fraction of sources with [O ii] above our equivalent width limit is comparable to what we find in the low-redshift universe from GAMA and MASSIVE, except perhaps at the highest stellar masses (>1011.5 M o˙). However, stacked spectra for the individual low-equivalent-width systems uniquely indicates ubiquitous [O ii] emission in the higher-z LEGA-C sample, with typical [O ii] luminosities per unit stellar mass that are a factor of ×3 larger than the lower-z GAMA sample. Star formation at higher-z could play a role in producing the [O ii] emission, although it is unlikely to provide the bulk of the ionizing photons. More work is required to fully quantify the contributions of evolved stellar populations or active galactic nuclei to the observed spectra. © 2021. The American Astronomical Society. All rights reserved.. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85121770446&doi=10.3847%2f1538-4357%2fac2bfe&partnerID=40&md5=ad28bbcee654395c0b724d9c62e77b62 https://scholars.lib.ntu.edu.tw/handle/123456789/624899 |
ISSN: | 0004637X | DOI: | 10.3847/1538-4357/ac2bfe |
顯示於: | 天文物理研究所 |
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