ATTENZIONE! IL REPOSITORY E’ APERTO ESCLUSIVAMENTE ALL’IMMISSIONE DEI RAPPORTI TECNICI (COLLEZIONE 4.01). NON E’ POSSIBILE INSERIRE PRODOTTI IN TUTTE LE ALTRE COLLEZIONI, A CAUSA DI PROBLEMI TECNICI. THE REPOSITORY IS OPEN EXCLUSIVELY FOR THE SUBMISSION OF TECHNICAL REPORTS (COLLECTION 4.01). SUBMISSIONS TO ALL OTHER COLLECTIONS ARE TEMPORARILY UNAVAILABLE, DUE TO TECHNICAL ISSUES.
 

In and out star formation in z 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared

Journal
Date Issued
2017
Author(s)
Gobat, R.
•
Daddi, E.
•
•
•
•
Ma, Z.
•
Jin, S.
•
Maraston, C.
•
Magdis, G.
•
Béthermin, M.
•
Cappellari, M.
•
Carollo, M.
•
Cimatti, A.
•
•
Moresco, M.
•
Onodera, M.
•
•
Renzini, A.
•
Sargent, M.
•
Valentino, F.
•
DOI
Abstract
We present a sample of 34 spectroscopically confirmed BzK-selected 1011M☉ 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 SFROII 3.7-4.5M☉ yr-1. 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 (SFRFIR 2-4M☉ yr-1). 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 http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/599/A95
Volume
599
Start page
A95
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2017A&A...599A..95G
Rights
open.access
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