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http://hdl.handle.net/20.500.12386/27054
Titolo: | In and out star formation in z 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared | Autori: | Gobat, R. Daddi, E. Strazzullo, V. GARILLI, BIANCA MARIA ROSA MIGNOLI, Marco Ma, Z. Jin, S. Maraston, C. Magdis, G. Béthermin, M. Cappellari, M. Carollo, M. Cimatti, A. Feruglio, Chiara Moresco, M. Onodera, M. POZZETTI, Lucia Renzini, A. Sargent, M. Valentino, F. ZANELLA, ANITA |
Data pubblicazione: | 2017 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 599 | Da pagina:: | A95 | Abstract: | We present a sample of 34 spectroscopically confirmed BzK-selected 10<SUP>11</SUP>M<SUB>☉</SUB> quiescent galaxies (pBzK) in the COSMOS field. The targets were initially observed with VIMOS on the VLT to facilitate the calibration of the photometric redshifts of massive galaxies at z ≳ 1.5. Here we describe the reduction and analysis of the data, and the spectrophotometric properties of these pBzK galaxies. In particular, using a spatially resolved median 2D spectrum, we find that the fraction of stellar populations with ages <1 Gyr is at least 3 times higher in the outer regions of the pBzK galaxies than in their cores. This results in a mild age gradient of ∆age ≤ 0.4 Gyr over 6 kpc and suggests either the occurrence of widespread rejuvenation episodes or that inside-out quenching played a role in the passivization of this galaxy population. We also report on low-level star formation rates derived from the [OII]3727 Å emission line, with SFR<SUB>OII</SUB> 3.7-4.5M<SUB>☉</SUB> yr<SUP>-1</SUP>. This estimate is confirmed by an independent measurement on a separate sample of similarly-selected quiescent galaxies in the COSMOS field, using stacked far-infrared data (SFR<SUB>FIR</SUB> 2-4M<SUB>☉</SUB> yr<SUP>-1</SUP>). This second, photometric sample also displays significant excess at 1.4 GHz, suggestive of the presence of radio-mode AGN activity. The stacked VIMOS spectrum of all A+B quality ETGs is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (<A href="http://130.79.128.5">http://130.79.128.5</A>) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/599/A95">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/599/A95 | URI: | http://hdl.handle.net/20.500.12386/27054 | URL: | https://www.aanda.org/articles/aa/abs/2017/03/aa29852-16/aa29852-16.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201629852 | Bibcode ADS: | 2017A&A...599A..95G | Fulltext: | open |
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