AAS 197, January 2001
Session 76. Galaxy Evolution I
Display, Wednesday, January 10, 2001, 9:30am-7:00pm, Exhibit Hall

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[76.12] HST NICMOS snapshot survey of faint galaxies at z < 1

S. Hinkley, M. Im (UCSC), DEEP Team

During Cycle 7 HST observations, we have obtained NICMOS H-band images of faint field galaxies for which both HST morphological information (in V and/or I) and spectroscopic redshifts are available. The purpose of the NICMOS observation is to provide their morphology in rest frame NIR wavelengths (8000 - 16000 Å), where the effect of dust extinction is less severe, and to obtain their near infrared (NIR) colors.

The objects in our field are partly contained in the Groth Strip being studied in detail by the DEEP team. In addition, we have made use of a software package called GIM2D (Simard et al. 2001). This package is designed to perform detailed 2-dimensional decompositions for images of distant galaxies. Using this software, we have obtained structural parameters for the objects in the H-band to complement those parameters in V and I.

We will present: i) color gradients inside elliptical galaxies to test models of their formation; ii) the effect of dust extinction on the properties of field galaxies at 0 < z < 1;

iii) evolution of V-H, and V-I colors of bulges as well as the B/T ratio of spiral galaxies as a function of redshift; iv) morphological k-correction.

The median redshift of our sample is z ~0.5 and this corresponds to about one half of the current age of the universe.

This work is supported by the STScI grant GO-07895.02-96A.

The author(s) of this abstract have provided an email address for comments about the abstract: shinkley@ucolick.org

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