The Evolution of Early-type Field Galaxies Selected from a NICMOS Map of the Hubble Deep Field North

Details The Evolution of Early-type Field Galaxies Selected from a NICMOS Map of the Hubble Deep Field North The Evolution of Early-type Field Galaxies Selected from a NICMOS Map of the Hubble Deep Field North

2003-10-08

arxiv.org/abs/astro-ph/0310231v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astronomical Journal; 54 pages, 21 figures. Figures 10 and 11 are included separately in JPEG

Scientific paper

10.1086/380612

The redshift distribution of well-defined samples of distant early-type galaxies offers a means to test the predictions of monolithic and hierarchical galaxy formation scenarios. NICMOS maps of the entire Hubble Deep Field North in the F110W and F160W filters, when combined with the available WFPC2 data, allow us to calculate photometric redshifts and determine the morphological appearance of galaxies at rest-frame optical wavelengths out to z ~ 2.5. Here we report results for two subsamples of early-type galaxies, defined primarily by their morphologies in the F160W band, which were selected from the NICMOS data down to H160_{AB} < 24.0. The observed redshift distributions of our two early-type samples do not match that predicted by a monolithic collapse model, which shows an overabundance at z > 1.5. A hierarchical formation model better matches the redshift distribution of the HDF-N early-types at z > 1.5, but still does not adequately describe the observed early-types. The hierarchical model predicts significantly bluer colors on average than the observed early-type colors, and underpredicts the observed number of early-types at z < 1. [abridged]

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