An Optical Multicolor System For Measuring Galaxy Redshifts And Spectral Types

Details An Optical Multicolor System For Measuring Galaxy Redshifts And Spectral Types An Optical Multicolor System For Measuring Galaxy Redshifts And Spectral Types

1998-06-02

arxiv.org/abs/astro-ph/9806040v1

Astronomy and Astrophysics

Astrophysics

Accepted to AJ; 22 pages including figures

Scientific paper

10.1086/300480

A method of obtaining approximate redshifts and spectral types of galaxies using a photometric system of six broad-bandpass filters is developed. The technique utilizes a smallest maximum difference approach rather than a least-squares approach, and does not consider a galaxy's apparent magnitude in the determination of its redshift. In an evalution of its accuracy using two distinct galaxy samples, the photometric redshifts are found to have a root mean square deviation of $\pm$0.05 from spectroscopically determined redshifts. Possible systematic errors of the method are investigated, including the effects of post-starburst (``E+A'') galaxies and attempts to measure redshifts with incomplete color information. Applications of the technique are discussed.

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