AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 4. Evolution of Galaxies, Galaxy Surveys
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southwest Exhibit Hall

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[4.10] Photometric Redshifts in the Sloan Colors

D. Sowards-Emmerd, T. A. Mckay, E. Sheldon, J. A. Smith (University of Michigan)

In the past few years, photometric redshifts have proven themselves to be a robust means of estimating redshifts. In the near future, the Sloan Digital Sky Survey will compile high-quality photometric data for ~108 galaxies. Photometric redshifts will provide approximate distances to this enormous set of objects. In this poster, we describe results from a preliminary study of photometric redshift calibration on data in the SDSS colors. We present 5 color photometry for 2195 galaxies drawn from the Las Campanas Redshift Survey. Data was obtained on the Curtis Schmidt telescope at CTIO during Aug 97 and Feb/Mar 98 using filters nearly identical to the SDSS system. We also present photometric redshift predictions expressed as polynomial functions of galaxy colors and magnitudes derived from this training set. Finally, applications of photometric redshifts will be considered, including lensing studies, cosmology, and determination of fundamental astrophysical quantities. Support was provided by NSF grant #9703282.

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