VizieR Online Data Catalog: Cl 1103.7-1245 at z=0.96: spectroscopic catalog (Vulcani+, 2012)
Abstract
The target selection strategy, mask design procedure and observations are similar to those adopted for the EDisCS spectroscopy, described in detail in Halliday et al. (2004, Cat. J/A+A/427/397) and Milvang-Jensen et al. (2008, Cat. J/A+A/482/419). The target selection was based on the available VLT/FORS2 optical photometry (White et al., 2005, Cat. J/A+A/444/365) and the NTT/SOFI NIR photometry (Aragon-Salamanca et al., in preparation). The optical data cover 6.5'x6.5' and are well-matched to the FORS2 spectrograph field-of-view. The NIR data cover a somewhat smaller region of 4.2'x5.4'.
Spectroscopic observations were completed using the FORS2 spectrograph (cf. Appenzeller et al., 1998Msngr..94....1A) on the VLT, during one observing run in March 2008, comprised of 3 half-nights. A high-efficiency grism was used (grism 600RI+19, λcentral=6780Å, resolution FWHM~6Å). The exposure time was 1800 seconds per frame, for a total of 8 frames per mask. A total of 3 masks were observed, for a total of 94 slits (33 slits in mask 1 and 2 and 28 slits in mask 3). The reduction was performed using an "improved sky subtraction", whose properties and advantages have been largely described and discussed in Milvang-Jensen et al. (2008, Cat. J/A+A/482/419). Galaxy redshifts were measured from the reduced 1D spectra, using emission lines where possible, as done in Poggianti et al. (2006ApJ...642..188P). In addition, when possible, we also measured the equivalent width of [OII] and Hδ. Note that for star-forming galaxies the Hδ absorption line may be affected by emission in-filling. We have not attempted to correct for this effect. (1 data file).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- July 2012
- DOI:
- 10.26093/cds/vizier.35440104
- Bibcode:
- 2012yCat..35440104V
- Keywords:
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- Galaxy catalogs;
- Spectroscopy;
- Redshifts