AAS 203rd Meeting, January 2004
Session 131 Galaxy Evolution with HST Surveys
Oral, Thursday, January 8, 2004, 2:00-3:30pm, Centennial III

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[131.01] z~6 galaxies in the HST Ultra Deep Parallel Fields

G.D. Illingworth, R.J. Bouwens (UC Santa Cruz), R. I. Thompson (University of Arizona)

We investigate the properties of z~6 galaxies in two HST Ultra Deep Field Parallel Fields using the well-established i-dropout technique. These fields were obtained as part of the UDF-IR team's NICMOS observations of the Ultra Deep Field (UDF). They extend i-dropout censuses some 1 magnitude deeper than those performed on GOODS and to within 1 magnitude of the Ultra Deep Field over nearly double the area (24 arcmin2). The flux levels enable us to probe the z~6 LF to faint levels (>0.15 L*), with surface brightness sensitivites sufficient to obtain good measures of the mean object size. We report on the evolution of the rest-frame continuum UV luminosity density, star formation rate, and object size over the relatively large redshift baseline z~2 to z~6, likely the deepest such census of z~6 galaxies until the availability of the UDF.

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.