AAS 205th Meeting, 9-13 January 2005
Session 128 The Buildup of Galaxy Disks - Star Formation History
Oral, Wednesday, January 12, 2005, 2:00-3:30pm, California

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[128.03] Stellar Populations and Kinematics of Star-forming Galaxies at z~2

D.K. Erb, C.C. Steidel (Caltech), A.E. Shapley (Berkeley), M. Pettini (IoA), N.A. Reddy (Caltech), K.L. Adelberger (OCIW)

We have assembled a sample of several hundred star-forming galaxies at z~2, selected by their rest-frame UV colors and with spectroscopically confirmed redshifts. We use UGRJK photometry and mid-IR data from the Spitzer Space Telescope to model their stellar populations, masses and star formation rates. We also use near-IR H\alpha spectra of over 100 of these galaxies to determine dynamical masses, kinematic properties, and star formation rates. Approximately 8% of the sample have stellar masses greater than ~1011 M\odot, with ages of 2-3 Gyr. I will compare the stellar masses derived from the photometric modeling with dynamical masses from the width of the H\alpha emission line. We also use the [NII]/H\alpha ratio to estimate metallicity, and find a significant number of massive galaxies with approximately solar metallicities. The sample shows considerable diversity in mass, age and metallicity, and intriguing differences with respect to the Lyman break galaxies at z~3.

The author(s) of this abstract have provided an email address for comments about the abstract: dke@astro.caltech.edu

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