A Study Of Massive Bulge-less Disk Galaxies At Z 1 Using LGS-AO NIRC2 K'-band And ACS I-band Imaging

Details A Study Of Massive Bulge-less Disk Galaxies At Z 1 Using LGS-AO NIRC2 K'-band And ACS I-band Imaging A Study Of Massive Bulge-less Disk Galaxies At Z 1 Using LGS-AO NIRC2 K'-band And ACS I-band Imaging

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342427m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #424.27; Bulletin of the American Astronomical Society, Vol. 41, p.250

Physics

Optics

Scientific paper

An outstanding problem in galaxy formation is the mechanism behind galaxy bulge formation. Possible mechanisms include rapid merger driven processes at early times and a more gradual formation process driven by secular processes. In the local universe, massive galaxies are rarely bulge-less. By redshift z 1, however, massive bulge-less galaxies appear fairly common, when viewed in rest frame blue light. We present results from analyzing massive galaxies in the COSMOS, GOODS, and EGS fields using I-band from ACS on HST and K'-band from laser guide star adaptive optics (LGS-AO) on NIRC2 at Keck2. K' imagery of 150 field galaxies is culled from the 15 square arcminutes of Keck natural and laser guide star adaptive optics pointings in the CfAO Treasury Survey (Melbourne et al 2005). At z 1, the I-band translates to rest-frame U- or B-band which traces young stellar populations and is sensitive to extinction. By adding the LGS-AO K'-band (rest-frame near infrared), we are able to trace the actual stellar structure of galaxies at high spatial resolution. Diffraction-limited IR data is optimal for constraining the fraction of red bulges, which may be as small as 0.1” at z 1. Morphological analysis of Keck LGS-AO K' imagery is possible at the 0.05” level, as we derive our point spread function at all field points via an independent method (Steinbring et al 2005). We use these data to determine whether bulge-less galaxies are truly common at z 1, and hence we can explore various models of bulge formation.

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