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J/A+A/599/A95       Star formation in z∼1.5 quiescent galaxies    (Gobat+, 2017)

In and out star formation in z∼1.5 quiescent galaxies from rest-frame UV spectroscopy and the far infrared. Gobat R., Daddi E., Strazzullo V., Garilli B., Mignoli M., Ma Z., Jin S., Maraston C., Bethermin M., Cappellari M., Carollo M., Cimatti A., Feruglio C., Moresco M., Onodera M., Pozzetti L., Renzini A., Valentino F., Zanella A. <Astron. Astrophys. 599, A95 (2017)> =2017A&A...599A..95G (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra Keywords: galaxies: high-redshift - galaxies: elliptical and lenticular, cD - galaxies: formation - galaxies: stellar content - galaxies: star formation 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 <1Gyr 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 {DELTA}age≤0.4Gyr over ∼6kpc 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]3727Å emission line, with SFROII∼3.7-4.5M/yr. 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). This second, photometric sample also displays significant excess at 1.4GHz, suggestive of the presence of radio-mode AGN activity. Description: Median VIMOS spectrum of 31 BzK-selected massive quiescent galaxies in the COSMOS field, with a median redshift of z=1.5. The observations were carried out during ESO programs 086.A-0681 and 088.A-0671 using the medium resolution grism and GG475 order-sorting filter, with a slit width of 1-arcsec. The 2D data were reduced with VIPGI pipeline, and corrected for redshift and cosmological dimming before stacking. The 1D spectrum was extracted using a 12-pixel aperture. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 23 1599 Median 1D VIMOS spectrum of z∼1.5 ETGs
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 F7.2 0.1nm lambda Rest-frame wavelength 10- 15 F6.4 --- Flux Flux, F(lambda) (1) 18- 23 F6.4 --- e_Flux Standard error on Flux (1)
Note (1): Flux and standard error are in arbitrary units.
Acknowledgements: Raphael Gobat, rgobat(at)kias.re.kr
(End) Raphael Gobat [KIAS, South Korea], Patricia Vannier [CDS] 27-Dec-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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