Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-21
Astronomy and Astrophysics
Astrophysics
Conference proceedings, IAU Symposium 245, Formation and Evolution of Galaxy Bulges, Oxford, July 16-20 2007
Scientific paper
10.1017/S1743921308018334
In order to reveal the stellar mass distribution of z~3 galaxies, we are conducting deep imaging observations of U-dropout Lyman Break Galaxies (LBGs) with Adaptive Optics (AO) systems in K-band, which corresponds to rest-frame V-band of z~3 galaxies. The results of the Subaru intensive-program observations with AO36/NGS/IRCS indicate that 1) the K-band peaks of some of the LBGs brighter than K=22.0 mag show significant offset from those in the optical images, 2) the z~3 Mv* LBGs and serendipitously observed Distant Red Galaxies (DRGs) have flat profiles similar to disk galaxies in the local universe (i.e., Sersic with n<2), and 3) the surface stellar mass densities of the Mv* LBGs are 3-6 times larger than those of disk galaxies at z=0-1. Considering the lack of n>2 systems among the luminous z~3 LBGs and DRGs, and their strong spatial clustering, we infer that the dense n<2 disk-like structures evolve into the n>2 spheroids of nearby galaxies through relaxations due to major merger events.
Akiyama Masayuki
Iwata Ikuru
Kobayashi Nami
Minowa Yosuke
Ohta Kazutoshi
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