Predicting the Quasar Photometric Reshift with the Sloan Digital Sky Survey Filter System

Details Predicting the Quasar Photometric Reshift with the Sloan Digital Sky Survey Filter System Predicting the Quasar Photometric Reshift with the Sloan Digital Sky Survey Filter System

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..osf..ce01l&link_type=abstract

American Physical Society, Ohio Section Fall Meeting, October 8-9, 1999 Wright State University/Air Force Institute of Technolog

Physics

Scientific paper

Photometric data were obtained for a set of known quasars (QSOs) in five bands with the Sloan Digital Sky Survey (SDSS) filter system for the purpose of testing the ability of the SDSS system to accurately predict the photometric redshift of QSOs. The initial plot of the SDSS photometric redshift versus the measured redshift shows a good relationship, but a lot of scatter. A literature search was conducted on a selected sampling of 49 QSOs, 26 with redshift z <= 0.5 and 23 with 0.5 < z < 2.6, to confirm their accurate identifications as QSOs with their advertised redshifts. This search revealed 10 rejected QSOs which were not QSOs but rather Seyfert galaxies or Narrow Line Objects. Additionally, 11 QSOs were either Broad Absorption Line Systems or had spectra that were in some way incomplete, and therefore, their QSO identification could not be confirmed. The revised plot, with the rejected and unconfirmed QSOs removed, gives an excellent straight line with very little scatter. Although these results are preliminary and for only a small sampling of QSOs, they show that further study of the relationship is warranted and that eventually the SDSS method may be used to accurately predict the photometric redshift of QSOs.

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