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• W2024409675 abstract "Quiescent galaxies at z ∼ 2 have been identified in large numbers based on rest-frame colors, but only a small number of these galaxies have been spectroscopically confirmed to show that their rest-frame optical spectra show either strong Balmer or metal absorption lines. Here, we median stack the rest-frame optical spectra for 171 photometrically quiescent galaxies at 1.4 < z < 2.2 from the 3D-HST grism survey. In addition to Hβ (λ4861 Å), we unambiguously identify metal absorption lines in the stacked spectrum, including the G band (λ4304 Å), Mg i (λ5175 Å), and Na i (λ5894 Å). This finding demonstrates that galaxies with relatively old stellar populations already existed when the universe was ∼3 Gyr old, and that rest-frame color selection techniques can efficiently select them. We find an average age of Gyr when fitting a simple stellar population to the entire stack. We confirm our previous result from medium-band photometry that the stellar age varies with the colors of quiescent galaxies: the reddest 80% of galaxies are dominated by metal lines and have a relatively old mean age of Gyr, whereas the bluest (and brightest) galaxies have strong Balmer lines and a spectroscopic age of Gyr. Although the spectrum is dominated by an evolved stellar population, we also find [O iii] and Hβ emission. Interestingly, this emission is more centrally concentrated than the continuum with erg s−1, indicating residual central star formation or nuclear activity." @default.
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• W2024409675 date "2013-06-10" @default.
• W2024409675 modified "2023-10-18" @default.
• W2024409675 title "QUIESCENT GALAXIES IN THE 3D-HST SURVEY: SPECTROSCOPIC CONFIRMATION OF A LARGE NUMBER OF GALAXIES WITH RELATIVELY OLD STELLAR POPULATIONS AT <i>z</i> ∼ 2" @default.
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• W2024409675 doi "https://doi.org/10.1088/2041-8205/770/2/l39" @default.
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