In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared
We present a sample of 34 spectroscopically confirmed BzK-selected 1011 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 and 1:5. Here we describe the reducti...
| Κύριοι συγγραφείς: | , , , , , , , , , , , , , , , , , , , , |
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| Μορφή: | Journal article |
| Γλώσσα: | English |
| Έκδοση: |
EDP Sciences
2017
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| _version_ | 1826290329781796864 |
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| author | Gobat, R Daddi, E Strazzullo, V Garilli, B Mignoli, M Ma, Z Jin, S Maraston, C Magdis, G Béthermin, M Cappellari, M Carollo, M Cimatti, A Feruglio, C Moresco, M Onodera, M Pozzetti, L Renzini, A Sargent, M Valentino, F Zanella, A |
| author_facet | Gobat, R Daddi, E Strazzullo, V Garilli, B Mignoli, M Ma, Z Jin, S Maraston, C Magdis, G Béthermin, M Cappellari, M Carollo, M Cimatti, A Feruglio, C Moresco, M Onodera, M Pozzetti, L Renzini, A Sargent, M Valentino, F Zanella, A |
| author_sort | Gobat, R |
| collection | OXFORD |
| description | We present a sample of 34 spectroscopically confirmed BzK-selected 1011 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 and 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 emission line, with SFROII 3:74:5 M yr1. 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 24 M yr1). This second, photometric sample also displays significant excess at 1.4 GHz, suggestive of the presence of radio-mode AGN activity. |
| first_indexed | 2024-03-07T02:42:31Z |
| format | Journal article |
| id | oxford-uuid:aaf09160-7aa7-471e-bcdb-a958b98e6eae |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:42:31Z |
| publishDate | 2017 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | oxford-uuid:aaf09160-7aa7-471e-bcdb-a958b98e6eae2022-03-27T03:18:42ZIn and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infraredJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:aaf09160-7aa7-471e-bcdb-a958b98e6eaeEnglishSymplectic Elements at OxfordEDP Sciences2017Gobat, RDaddi, EStrazzullo, VGarilli, BMignoli, MMa, ZJin, SMaraston, CMagdis, GBéthermin, MCappellari, MCarollo, MCimatti, AFeruglio, CMoresco, MOnodera, MPozzetti, LRenzini, ASargent, MValentino, FZanella, AWe present a sample of 34 spectroscopically confirmed BzK-selected 1011 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 and 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 emission line, with SFROII 3:74:5 M yr1. 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 24 M yr1). This second, photometric sample also displays significant excess at 1.4 GHz, suggestive of the presence of radio-mode AGN activity. |
| spellingShingle | Gobat, R Daddi, E Strazzullo, V Garilli, B Mignoli, M Ma, Z Jin, S Maraston, C Magdis, G Béthermin, M Cappellari, M Carollo, M Cimatti, A Feruglio, C Moresco, M Onodera, M Pozzetti, L Renzini, A Sargent, M Valentino, F Zanella, A In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared |
| title | In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared |
| title_full | In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared |
| title_fullStr | In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared |
| title_full_unstemmed | In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared |
| title_short | In and out star formation in z ~ 1.5 quiescent galaxies from rest-frame UV spectroscopy and the far-infrared |
| title_sort | in and out star formation in z 1 5 quiescent galaxies from rest frame uv spectroscopy and the far infrared |
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