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z~6 i-DROPOUT GALAXIES IN THE SUBARU /XMM-NEWTON DEEP FIELD

  • OTA KAZUAKI (Department of Astronomy, Graduate School of Science, University of Tokyo) ;
  • KASHIKAWA NOBUNARI (National Astronomical Observatory of Japan) ;
  • NAKAJIMA TADASHI (National Astronomical Observatory of Japan) ;
  • IYE MASANORI (National Astronomical Observatory of Japan)
  • Published : 2005.06.01

Abstract

We conducted an extremely wide field survey of z ${\~}$ 6 Lyman break galaxies (LBGs) to precisely derive their bright end surface density overcoming the bias due to cosmic variance. We selected out LBG candidates in the Subaru/ XMM-Newton Deep Survey Field (SXDS) over the total of ${\~}1.0\;deg^2$ sky area down to $z_{AB} = 26.0 ({\ge}3{\sigma},\;2'.0 aperture)$ using i' - z' > 1.5 color cut. This sample alone is likely to be contaminated by M/L/T dwarfs, low-z elliptical galaxies, and z ${\~}$ 6 quasars. To eliminate these interlopers, we estimated their numbers using an exponential disk star count model, catalogs of old ellipticals in the SXDS and other field, and a z${\~}$6 quasar luminosity function. The finally derived surface density of z ${\~}$ 6 LBGs was 165 $mag^{-1}\;deg^{-2}$ down to $z_{AB}$ = 26.0 and shows good agreement with previous results from the narrower field survey of HST GOODS.

Keywords

cosmology: observations;early universe;galaxies: evolution;galaxies: formation

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