Integral Field Spectroscopy of High-Redshift Star-Forming Galaxies with Laser-Guided Adaptive Optics

Details Integral Field Spectroscopy of High-Redshift Star-Forming Galaxies with Laser-Guided Adaptive Optics Integral Field Spectroscopy of High-Redshift Star-Forming Galaxies with Laser-Guided Adaptive Optics

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2403l&link_type=abstract

American Astronomical Society, AAS Meeting #211, #24.03; Bulletin of the American Astronomical Society, Vol. 39, p.775

Physics

Optics

Scientific paper

We present a selection of results from an ongoing study of the kinematic structure of star-forming galaxies at redshift z = 2 - 3 using integral-field spectroscopy of rest-frame optical nebular emission lines in combination with Keck laser guide star adaptive optics (LGSAO). We show kinematic maps of 10 target galaxies, each of which is spatially resolved with a PSF measuring approximately 0.1 - 0.2 arcseconds (750 - 1500 pc at the redshift of the target galaxies) after cosmetic smoothing. The majority of galaxies are dominated by a relatively high local velocity dispersion ( 80 km/s) while only two galaxies show evidence for spatially resolved velocity shear. Using extant multi-wavelength spectroscopy and photometry we relate these kinematic data to physical properties such as stellar mass, gas fraction, star formation rate, and outflow kinematics and consider the applicability of current galaxy formation models. While some gas cooling models reproduce the observed kinematics better than a simple rotating disk model, even these provide a poor overall description of the target galaxies, suggesting that our current understanding of gas cooling mechanisms in galaxies in the early universe is (at best) incomplete. This work has been supported in part by grants AST 06-06912 and AST 03-07263 from the US National Science Foundation.

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