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112 records were found.

New data on the stellar dynamics of 20 powerful radio galaxies (PRGs) were collected with the KPNO 4 m using the RC spectrograph and a TI CCD and were combined with similar data in the literature to generate a total sample of 47 PRGs. A detailed investigation of the various PRG subgroups (normal/peculiar optical morphology, and presence/absence of optical emission lines) revealed important distinctions among these groups as well as distinctions between some PRGs and normal elliptical galaxies. It is found that PRGs with peculiar optical morphologies are dynamically peculiar as well: their stellar velocity dispersions are lower than those of both elliptical galaxies and PRGs with normal optical morphologies, and they show evidence for more rotational support. Results suggest that some of the PRGs are the product of a merger of two galax...
Comment: 6 pages, 4 figures. To appear in proceedings of "Deep Fields" meeting (Garching, October 2000)
Comment: 12 pages, 5 figures, accepted for publication in the Astrophysical Journal Letters, replaced with accepted version
We have detected 506 i-dropouts (z~6 galaxies) in deep, wide-area HST ACS fields: HUDF, enhanced GOODS, and HUDF-Parallel ACS fields (HUDF-Ps). The contamination levels are <=8% (i.e., >=92% are at z~6). With these samples, we present the most comprehensive, quantitative analyses of z~6 galaxies yet and provide optimal measures of the UV luminosity function (LF) and luminosity density at z~6, and their evolution to z~3. We redetermine the size and color evolution from z~6 to z~3. Field-to-field variations (cosmic variance), completeness, flux, and contamination corrections are modelled systematically and quantitatively. After corrections, we derive a rest-frame continuum UV (~1350 A) LF at z~6 that extends to M_{1350,AB} ~ -17.5 (0.04L*(z=3)). There is strong evidence for evolution of the LF between z~6 and z~3, most likely through a...
Comment: 56 pages, latex, 17 figures; figure 1 available upon request; ApJ, 481 in press
Comment: 4 pages, including figures. To appear in IAP Conference "Galaxy Dynamics: from the Early Universe to the Present"
Comment: 6 pages, 3 figures, to be published in Clustering at High Redshift, Marseilles, June 1999; eds. A. Mazure and O. Le Fevre. For full postscript version and postscript/gif color figures see http://www.strw.leidenuniv.nl/~franx/clusters/ms1054
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