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Title:
Five Thousand Galaxy Redshifts from PEARS
Authors:
Cohen, Seth H.; Ryan, R. E., Jr.; Malhotra, S.; Rhoads, J. E.; Hathi, N. P.; Windhorst, R. A.; Pirzkal, N.; Xu, C.; PEARS Team
Affiliation:
AA(Arizona State University), AB(), AC(Arizona State University), AD(Arizona State University), AE(Arizona State University), AF(Arizona State University), AG(Arizona State University), AH(Space Telescope Science Institute)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #19.01; Bulletin of the American Astronomical Society, Vol. 38, p.924
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...209.1901C

Abstract

We present over 5,000 galaxy spectro-photo-z’s (SPZ’s) using grism spectra from the HST/ACS Probing Evolution and Reionization Spectroscopically (PEARS) grism survey. PEARS covers nine ACS pointings at multiple position angles in the two GOODS fields. For i<27.0 mag, redshifts are computed using a combination of the R≈100 PEARS grism spectra and UV-optical-infrared broadband photometry. The addition of the grism spectra, which cover a wavelength range of 6000-9500 angstroms, provides improved redshift determination over traditional broadband-only photometric redshifts. In conjunction with our deeper pointing in the Hubble Ultra-Deep Field (i<28 mag), these SPZ’s are used to construct the galaxy luminosity function at z=1,which goes 1.5-2 magnitudes fainter than can be done with ground-based spectroscopy.

PEARS is an HST Treasury Program and is supported by HST grant 10530.

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