Astrometric Redshifts for Quasars

Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics

Scientific paper

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29 pages, 13 figures (3 color); AJ, accepted

Scientific paper

The wavelength dependence of atmospheric refraction causes differential chromatic refraction (DCR), whereby objects imaged at different optical/UV wavelengths are observed at slightly different positions in the plane of the detector. Strong spectral features induce changes in the effective wavelengths of broad-band filters that are capable of producing significant positional offsets with respect to standard DCR corrections. We examine such offsets for broad-emission-line (type 1) quasars from the Sloan Digital Sky Survey (SDSS) spanning 0

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