/ftp/cats/aliases/M/./MCE2007



==========================================================================
J/ApJS/171/1      Census of QSOs Narrow Absorption Lines         (Misawa+, 2007)
The following files can be converted to FITS (extension .fit or fit.gz)
	qsos.dat table5.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/171/1
==========================================================================

drwxr-xr-x 10 cats archive 182 Jan 29 2012 [Up] drwxr-xr-x 2 cats archive 264 Jan 13 2023 [TAR file] -rw-r--r-- 1 cats archive 476 Dec 19 2022 .message -r--r--r-- 1 cats archive 8325 Jun 10 2009 ReadMe -rw-r--r-- 1 cats archive 338 Jun 10 2009 +footg5.gif -rw-r--r-- 1 cats archive 2626 Jun 10 2009 +footg8.gif -r--r--r-- 1 cats archive 1825 May 22 2009 qsos.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 191976 Apr 14 2009 table5.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/ApJS/171/1 Census of QSOs Narrow Absorption Lines (Misawa+, 2007) ================================================================================ A census of intrinsic narrow absorption lines in the spectra of quasars at z=2-4. Misawa T., Charlton J.C., Eracleous M., Ganguly R., Tytler D., Kirkman D., Suzuki N., Lubin D. <Astrophys. J. Suppl. Ser., 171, 1-28 (2007)> =2007ApJS..171....1M ================================================================================ ADC_Keywords: Active gal. nuclei ; QSOs ; Spectroscopy Keywords: accretion: accretion disks - galaxies: active - quasars: absorption lines - quasars: general Abstract: We use Keck HIRES spectra of 37 optically bright quasars at z=2-4 to study narrow absorption lines that are intrinsic to the quasars (intrinsic NALs, produced in gas that is physically associated with the quasar central engine). We identify 150 NAL systems, which contain 124 CIV, 12 NV, and 50 SiIV doublets, of which 18 are associated systems (within 5000km/s of the quasar redshift). We use partial coverage analysis to separate intrinsic NALs from NALs produced in cosmologically intervening structures. We find 39 candidate intrinsic systems (28 reliable determinations and 11 that are possibly intrinsic). We estimate that 10%-17% of CIV systems at blueshifts of 5000-70000km/s relative to quasars are intrinsic. At least 32% of quasars contain one or more intrinsic CIV NALs. Considering NV and SiIV doublets showing partial coverage as well, at least 50% of quasars host intrinsic NALs. Description: The quasars in our sample were originally selected and observed in a survey aimed at measuring the deuterium-to-hydrogen abundance ratio (D/H) in the Lyalpha forest. The observations were carried out with Keck HIRES through a 1.14" slit resulting in a velocity resolution of  8km/s (FWHM). The spectra were extracted by the automated program, MAKEE, written by Tom Barlow.