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2010 CFHT Users Meeting
November 16-18, 2010
ASIAA Auditorium, Taipei, Taiwan

Poster Presentation

A simple theory for the sub-millimeter galaxies and their relation to Lyman-alpha emitters

Author(s): Hiroyuki Hirashita, Tamon Suwa, Yoichi Tamura

Presenter: Hiroyuki Hirashita (ASIAA)

We aim at understanding the statistical properties of luminous sub-millimeter
(submm) galaxies (SMGs) in the context of cosmological structure formation. By
utilizing a cosmological N-body simulation to calculate the distribution of dark
halos in the Universe, we consider the dust enrichment in individual halos by
Type II supernovae (SNe II). The SN II rate is estimated under a star formation
activity which is assumed to occur on a dynamical timescale in the dark matter
potential. Our simple framework successfully explains the luminosity function, the
typical star formation rate, and the typical dust mass of an observational SMG
sample at z = 3. We also examine the clustering properties of SMGs, since a positive
cross correlation between SMGs and Ly-alpha emitters (LAEs) is indeed observed
by a recent observation. In the simulation, we select SMGs by FIR dust luminosity >
10^12 Lsun, while LAEs are chosen such that the age and the virial mass are
consistent with the observed LAE properties. The SMGs and LAEs selected in this
way show a spatial cross correlation whose strength is consistent with the
observation. This confirms that the SMGs really trace the most clustered regions at
z = 3 and that their luminosities can be explained by the dust accumulation as a
result of their star formation activities. We finally extend our prediction to higher
redshifts.

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