IAU01659
Presentation type requested: EITHER
LYMAN BREAK GALAXIES AT Z=5 AROUND THE HDF-N
Ikuru Iwata
Department of Astronomy, Kyoto Univ.
The so-called "Lyman break method'' (detecting a redshifted break at 91.2nm via broad-band color selection) is one of the most powerful tools for exploring the nature of galaxies at high redshift. In this contribution, we present the result of our search for Lyman break galaxies (LBGs) at z ~ 5 in a ~ 600 square arcmin wide sky region including the Hubble Deep Field - North(HDF-N). The large aperture and a very wide field-of-view achieved by Subaru telescope Prime Focus Camera, as well as the abundant information of galaxies at intermediate redshifts provided by various studies in the HDF-N enabled us to construct a reliable sample of population at z ~ 5. We detected 310 LBG candidates at I < 25.5. The rest-frame UV luminosity function of the population at z ~ 5 derived statistically does not show a significant change from those at z ~ 3 - 4. This result and the short time-scale of star fortmation for LBGs (reported for objects at z~3) might indicate their star-formation process is sporadic, rather than constant.
Ohta Koji , Tamura Naoyuki , Ando Masataka , Wada Sinpei , Watanabe Chisato , Akiyama Masayuki , Aoki Kentaro
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