AGN-Dust-Obscured Galaxies at z~1-3 revealed by near-to-far infrared SED-fitting

摘要

Dust-Obscured galaxies(DOGs, Dey et al. 2008)are bright 24μm-selected sources with extreme obscuration at optical wavelengths(F_(24μm)/F_R> 982). Recent studies(Dey et al. 2008, Bussmann et al. 2009)describe an evolutionary scenario in which the starbursting nature of submillimeter galaxies(SMGs)evolves into the composite nature of DOGs as an underlying AGN grows; this is followed by a quasar phase that terminates star formation(SF), leading to the formation of a passive, massive elliptical galaxy. Within this context, DOGs could provide a key insight to an extremely dusty stage in the evolution of galaxies at z ~ 2, where both AGN and SF activity coexist.