[63.04] Morphologies of Mid-Infrared Galaxies

AAS 205th Meeting, 9-13 January 2005
Session 63 Spitzer Views on Galaxy Evolution
Poster, Tuesday, January 11, 2005, 9:20am-6:30pm, Exhibit Hall

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[63.04] Morphologies of Mid-Infrared Galaxies

M. Roscioli (Haverford College), P. Barmby, J.-S. Huang, M. L. N. Ashby, G. G. Fazio (Harvard-Smithsonian Center for Astrophysics)

We combine data from the Infrared Array Camera on the Spitzer Space Telescope, WFPC2 on the Hubble Space Telescope, and the DEEP redshift surveys to examine the morphologies of infrared-bright galaxies in the Groth Strip. Our sample includes 778 galaxies with redshifts up to z ~ 1.7. We examine the IRAC colors as a function of redshift for different morphological types, parameterized by the optical bulge/disk ratio. While the general agreement with galaxy template predictions is good, the IRAC colors are not precise enough to serve as primary indicators of morphological type for galaxies at high redshifts. A few galaxies with high bulge fractions have surprisingly red IR colors but appear to be a heterogeneous group. We compute bolometric IR luminosities and examine the properties of the LIRGs (L_IR>10¹⁰L_\sun), which we find are not restricted to any redshift or bulge fraction.

This research was supported through the SAO Summer Intern Program with a grant from the National Science Foundation and is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under NASA contract 1407.

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