Adaptive optics imaging of Lyman break galaxies as progenitors of spheroids in the local Universe

M. Akiyama, Y. Minowa, N. Kobayashi, K. Ohta, I. Iwata

Research output: Contribution to journalArticlepeer-review


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 $M$ LBGs and serendipitously observed Distant Red Galaxies (DRGs) have flat profiles similar to disk galaxies in the local universe (i.e., Srsic with n < 2), and 3) the surface stellar mass densities of the $M$ 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.

Original languageEnglish
Pages (from-to)447-450
Number of pages4
JournalProceedings of the International Astronomical Union
Issue numberS245
Publication statusPublished - 2007 Jul
Externally publishedYes


  • Cosmology: observations
  • Galaxies: formation
  • Galaxies: high-redshift

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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