XQ-100. X-shooter quasar spectra : J/MNRAS/462/3285


Authors : Perrotta S. orcid , D'odorico V., Prochaska J.X. (hide) , D'odorico V., Prochaska J.X. et..al

Bibcode : 2016MNRAS.462.3285P (ADS) (Simbad) (Objects) (hide)
Data origin :

CDS Keywords : Surveys; QSOs; Spectroscopy; Redshifts
UAT : Surveys, Quasars, Spectroscopy, Redshifted

Observation (OC)

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Inserted into VizieR : 15-May-2018
Last modification : 16-Aug-2024

Nature and statistical properties of quasar associated absorption systems in the XQ-100 Legacy Survey. (2016)

Keywords : galaxies high-redshift - intergalactic medium - quasars: absorption lines

Abstract:We statistically study the physical properties of a sample of narrow absorption line (NAL) systems looking for empirical evidences to distinguish between intrinsic and intervening NALs without taking into account any a priori definition or velocity cut-off. We analyse the spectra of 100 quasars with 3.5<z_em_<4.5, observed with X-shooter/Very Large Telescope in the context of the XQ-100 Legacy Survey. We detect an ~8{sigma} excess in the CIV number density within 10000km/s of the quasar emission redshift with respect to the random occurrence of NALs. This excess does not show a dependence on the quasar bolometric luminosity and it is not due to the redshift evolution of NALs. It extends far beyond the standard ...(more)
Abstract: (hide)
The quasars in our sample have been originally selected and observed in a new Legacy Survey, hereafter 'XQ-100', of 100 quasars at emission redshift z_em_=3.5-4.5 (ESO Large Programme 189.A-0424). The observations have been carried out with X-shooter/VLT (Vernet et al., 2011A&A...536A.105V). The released spectra provide a complete coverage from the atmospheric cut-off to the NIR with a spectral resolution R~6000-9000 depending on wavelength, and a median S/N~30 at the continuum level. XQ-100 provides the first large intermediate-resolution sample of high-redshift quasars with simultaneous rest-frame UV/optical coverage. A full description of the target selection, observations, and data reduction process is presented by Lopez et al. (2016A&A...594A..91L).


                
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