[100.06] The 1.6um Bump as a Photometric Redshift Indicator

AAS 201st Meeting, January, 2003
Session 100. Galaxy Evolution and Surveys: Miscellaneous
Oral, Wednesday, January 8, 2003, 10:00-11:30am, 613-614

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[100.06] The 1.6um Bump as a Photometric Redshift Indicator

M. Sawicki (DAO/HIA/NRC)

I describe the principle of using the 1.6um H^- spectral feature as a photometric redshift indicator and demonstrate that the technique holds promise by successfully recovering the redshifts of a small sample of z=0--1 galaxies using only their infrared (JHKL) photometry. I then consider the applicability of the technique to the 3.6--8um SIRTF filter set and investigate the systematic errors that could be present in photometric redshifts of SIRTF galaxies. Overall, it appears that --- with care and caveats --- the 1.6um bump will be a powerful tool for estimating redshifts of distant galaxies in upcoming deep space-borne infrared imaging surveys.

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