In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2017

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

Bianca Garilli
  • Fonction : Auteur
Zhongyang Ma
  • Fonction : Auteur
Claudia Maraston
  • Fonction : Auteur
  • PersonId : 957345
Michele Cappellari
  • Fonction : Auteur
  • PersonId : 947982
Andrea Cimatti
  • Fonction : Auteur
Masato Onodera
  • Fonction : Auteur
  • PersonId : 957313
Mark Sargent
Anita Zanella

Résumé

We present a sample of 34 spectroscopically confirmed BzK-selected ∼10 11 M 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 OII ∼ 3.7−4.5 M 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 (SFR FIR ∼ 2−4 M yr −1). This second, photometric sample also displays significant excess at 1.4 GHz, suggestive of the presence of radio-mode AGN activity.
Fichier principal
Vignette du fichier
Gobat2017.pdf (1.23 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01789201 , version 1 (09-05-2018)

Identifiants

Citer

Raphaël Gobat, Emanuele Daddi, Veronica Strazzullo, Bianca Garilli, Marco Mignoli, et al.. In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared. Astronomy and Astrophysics - A&A, 2017, 599, pp.95 - 95. ⟨10.1051/0004-6361/201629852⟩. ⟨hal-01789201⟩
1069 Consultations
44 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More