AAS 207th Meeting, 8-12 January 2006
Session 22 Evolution of Galaxies, Galaxies Surveys I
Poster, Monday, 9:20am-7:00pm, January 9, 2006, Exhibit Hall

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[22.15] Early-Type Galaxies on the Blue Color-Stellar Mass Sequence

S. J. Kannappan (UT Austin)

Analysis of z=0 galaxy surveys (the Nearby Field Galaxy Survey, HYPERLEDA/SDSS/2MASS) reveals a surprisingly abundant population of E/S0 galaxies residing on the blue color-stellar mass sequence below ~1011 Msun. Despite similarities in structure and dynamics to traditional red-sequence early-type galaxies, blue-sequence early types differ in their star formation histories and in other properties linked to local/global environment and gas accretion history. The origin of blue-sequence early types may involve galaxy mergers or interactions, cold-mode gas accretion, and/or the growth and transformation of disks and bulges.

This research was supported by an NSF Astronomy & Astrophysics Postdoctoral Fellowship under award AST-0401547.

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