Improved redshifts for SDSS quasar spectra (Hewett+, 2010)

Details Improved redshifts for SDSS quasar spectra (Hewett+, 2010) Improved redshifts for SDSS quasar spectra (Hewett+, 2010)

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ycat..74052302h&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/405/2302. Originally published in: 2010MNRAS.405.2302H

Computer Science

Surveys, Qsos, Redshifts

Scientific paper

A systematic investigation of the relationship between different redshift estimation schemes for more than 91000 quasars in the Sloan Digital Sky Survey (SDSS) Data Release 6 is presented. The publicly available SDSS quasar redshifts are shown to possess systematic biases of Δz/(1+z)>=0.002 (600km/s) over both small (δz~=0.1) and large (δz~=1) redshift intervals. Empirical relationships between redshifts based on (i) CaII H&K host galaxy absorption, (ii) quasar [OII] λλ3728, (iii) [OIII] λλ 4960, 5008 emission and (iv) cross-correlation (with a master-quasar template) that includes, at increasing quasar redshift, the prominent MgII λλ 2799, CIII] λλ 1908 and CIV λλ 1549 emission lines are established as a function of quasar redshift and luminosity. New redshifts in the resulting catalogue possess systematic biases, a factor of ~=20 lower compared to the SDSS redshift values; systematic effects are reduced to the level of Δz/(1+z) (30km/s) per unit redshift or <=2.5x10-5^ per unit absolute magnitude. Redshift errors, including components due both to internal reproducibility and to the intrinsic quasar-to-quasar variation among the population, are available for all quasars in the catalogue. The improved redshifts and their associated errors have wide applicability in areas such as quasar absorption outflows, quasar clustering, quasar-galaxy clustering and proximity-effect determinations.
(2 data files).

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