Other
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ycat..21720070l&link_type=abstract
VizieR On-line Data Catalog: J/ApJS/172/70. Originally published in: 2007ApJS..172...70L
Other
1
Surveys, Redshifts
Scientific paper
A total of 10643 spectra could be extracted from the VIMOS observations and are presented in this release. Throughout the zCOSMOS-bright survey, 1arcsec wide slits have been used with a wavelength range of approximately 5500 to 9700{AA} sampled at roughly 2.5{AA}/pixel. The primary input catalogue for slit-mask design was generated using SExtractor (Bertin et al., 1996A&AS..117..393B) applied to the COSMOS F814W HST/ACS images sampled at 0.03arcsec/pixel (Koekemoer et al., 2007ApJS..172..196K, Leauthaud et al., 2007ApJS..172..219L) in a "hot and cold" two-pass process to first identify bright objects. This substantially reduced the tendency of the HST-based catalogue to "over-resolve" extended galaxies into multiple components. This initial SExtractor catalogue was then "cleaned" by carrying out a detailed comparison with one extracted from a stack of i* images obtained with MEGACAM on the 3.6m Canada-France-Hawaii telescope and processed at the TERAPIX data reduction center in Paris. This catalogue was also used to supplement the ACS catalogue for regions where the ACS images were unavailable or unusable. The zCOSMOS-bright target catalogue is intended to be simply defined as having an ACS/HST SExtractor "magauto" brightness in the range 15.00AB(814)<22.50.
Generally, objects to be inserted into the slit mask are chosen randomly from the target catalogue. However, a few percent of targets (generally X-ray sources) are designated as "compulsory" targets and inserted into the masks with first priority. As a result, they are over-represented in the spectroscopic catalogue, by a factor which happens to be close to 2.0. Objects strongly suspected of being stars on the basis of morphology and spectral energy distribution are not included in the masks as targets and are classified as "forbidden". These are about 15% of the I<22.5 sample. However, the criteria for this exclusion are deliberately quite conservative and about 4% of the spectroscopic targets turn out to be stars.
For each slit there is a primary target. Naturally, sometimes other targets happen to fall in the same slit. These "secondary targets" are indicated by preceding the redshift confidence class (see below) by a "2". Sometimes, these secondary objects were forbidden, but their spectra were anyway reduced and included in the catalogue.
Given the inevitable complexity of the sample, users who require statistically complete samples are strongly encouraged to contact the zCOSMOS team for guidance.
(3 data files).
Arnouts Stephane
Aussel Herve
Bardelli Sandro
Bolzonella Micol
Bongiorno Angela
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