In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared
- Gobat, Raphaël
- Daddi, Emanuele
- Strazzullo, Veronica
- Garilli, Bianca
- Mignoli, Marco
- Ma, Zhongyang
- Jin, Shuowen
- Maraston, Claudia
- Magdis, Georgios
- Bethermin, Matthieu
- Cappellari, Michele
- Carollo, Marcella
- Cimatti, Andrea
- Feruglio, Chiara
- Moresco, Michele
- Onodera, Masato
- Pozzetti, Lucia
- Renzini, Alvio
- Sargent, Mark
- Valentino, Francesco
- Zanella, Anita
DOIAbstract
12 pages, 10 figures, accepted for publication in Astronomy & AstrophysicsInternational audienceWe 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...
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