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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693636.0, MPI für Astronomie / Publikationen_mpia
GMASS ultradeep spectroscopy of galaxies at z ~ 2. VII. Sample selection and spectroscopy
Authors:Kurk, J.; Cimatti, A.; Daddi, E.; Mignoli, M.; Pozzetti, L.; Dickinson, M.; Bolzonella, M.; Zamorani, G.; Cassata, P.; Rodighiero, G.; Franceschini, A.; Renzini, A.; Rosati, P.; Halliday, C.; Berta, S.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Astronomy and Astrophysics
Start Page:id.A63 (43 pp)
Audience:Not Specified
Abstract / Description:Context. Ultra-deep imaging of small parts of the sky has revealed many populations of distant galaxies, providing insight into the early stages of galaxy evolution. Spectroscopic follow-up has mostly targeted galaxies with strong emission lines at z > 2 or concentrated on galaxies at z < 1. <BR /> Aims: The populations of both quiescent and actively star-forming galaxies at 1 < z < 2 are still under-represented in our general census of galaxies throughout the history of the Universe. In the light of galaxy formation models, however, the evolution of galaxies at these redshifts is of pivotal importance and merits further investigation. In addition, photometry provides only limited clues about the nature and evolutionary status of these galaxies. We therefore designed a spectroscopic observing campaign of a sample of both massive, quiescent and star-forming galaxies at z > 1.4. <BR /> Methods: To determine redshifts and physical properties, such as metallicity, dust content, dynamical masses, and star formation history, we performed ultra-deep spectroscopy with the red-sensitive optical spectrograph FORS2 at the Very Large Telescope. We first constructed a sample of objects, within the CDFS/GOODS area, detected at 4.5 μm, to be sensitive to stellar mass rather than star formation intensity. The spectroscopic targets were selected with a photometric redshift constraint (z > 1.4) and magnitude constraints (BAB < 26, IAB < 26.5), which should ensure that these are faint, distant, and fairly massive galaxies. <BR /> Results: We present the sample selection, survey design, observations, data reduction, and spectroscopic redshifts. Up to 30 h of spectroscopy of 174 spectroscopic targets and 70 additional objects enabled us to determine 210 redshifts, of which 145 are at z > 1.4. The redshift distribution is clearly inhomogeneous with several pronounced redshift peaks. From the redshifts and photometry, we deduce that the BzK selection criteria are efficient (82%) and suffer low contamination (11%). Several papers based on the GMASS survey show its value for studies of galaxy formation and evolution. We publicly release the redshifts and reduced spectra. In combination with existing and on-going additional observations in CDFS/GOODS, this data set provides a legacy for future studies of distant galaxies. Based on observations of the Very Large Telescope Large Programme 173.A-0687 carried out at the European Southern Observatory, Paranal, Chile.Appendices are available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A>FITS files of the spectra displayed in Appendix B are only available in electronic form at the CDS via anonymous ftp to <A href="">cdsarc.u-strasbg.fr (</A> or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/549/A63"> http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/549/A63</A>
Free Keywords:galaxies: distances and redshifts; galaxies: evolution; galaxies: formation; galaxies: fundamental parameters; galaxies: high-redshift
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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