Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21334205i&link_type=abstract
American Astronomical Society, AAS Meeting #213, #342.05; Bulletin of the American Astronomical Society, Vol. 41, p.477
Astronomy and Astrophysics
Astronomy
Scientific paper
We will present the overview and the initial results of the AKARI mission program, QSONG (Quasar Spectroscopic Observation with NIR Grism). QSONG is a recently started AKARI phase-3 mission program which utilizes the unique AKARI capability of performing spectroscopic observation at 2.5 - 5 μm, with the aim of understanding the mass evolution of 150 quasars at 3.5 < z < 6.5, and the rest-frame NIR spectra of 50 well-studied quasars at z 0. The high redshift QSONG program will detect and resolve the redshifted optical lines such as Hα. Until the launch of JWST, AKARI will be the only facility which enables such a study of the rest-frame optical spectra of high redshift objects out to z 6.5. We will measure the supermassive black hole (SMBH) masses at high redshift using the well-calibrated optical mass-estimators, in order to provide an independent assessment of UV line-based mass measurements whose reliability has been controversial. Ultimately, the extensive study of the rest-frame optical spectra of high redshift QSOs will allow us to understand the evolution and growth of SMBHs in the early universe. The low redshift QSONG program will provide an extensive set of the rest-frame 2.5-5.0 micron spectra of AGNs for the first time, which can serve as a strong basis for the future studies of dusty AGNs using NIR Hydrogen lines where the dust-extinction is minimal. Our initial QSONG result indicates a lack of very massive SMBHs at z > 5.5, suggesting that we are possibly witnessing the cosmic growth history of the very massive SMBHs in the early universe. This research was supported by the creative initiative program, Center of Evolution and Origin of the Universe (CEOU) of the KOSEF/MOST.
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