Proto-Quasars:Physical States and Observable Properties
arXiv:astro-ph/0209452 · doi:10.1086/345085
Abstract
Based on the radiation hydrodynamical model for the black hole(BH) growth,incorporated with the chemical evolution of the early-type host galaxy, we construct the coevolution model of a QSO BH and the host galaxy. As a result, it is found that after a galactic wind epoch,the luminosity is shifted from the host-dominant phase to the AGN-dominant phase (QSO phase) in the timescale of a few years.The former phase corresponds to the early stage of growing BH, and can be regarded as a ``proto-QSO'' phase. It has observable characteristic properties (detail inthis paper).By comparing these predictions with recent observations, radio galaxies are a possible candidate for proto-QSOs.Also, it is anticipated that the proto-QSO phase is preceded by an optically thick phase, which may correspond to ULIRGs.In this phase, is predicted to be much less than and grow with metallicity.Moreover, as precursors of ULIRGs, optically-thin star-forming galaxies are predicted. These may be in the assembly phase of Lyman break galaxies (LBGs) or Ly emitters.
7pages,7figures,accepted for publication in ApJ
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