XXIVth IAP Colloquium

Far away : light in the young universe at redshift beyond three

Monday July 7 to Friday July 11, 2008

List of IM's Presentation(s) ( Updated 20/01/2011 12:02:39 )

Precise if your presentation is oral or a poster : oral
Title of your presentation : SUPERMASSIVE BLACKHOLES OF QUASARS - AT WORLD'S END (4.5 < z < 6.5)

We present the rest-frame optical spectra of high redshift QSOs taken with AKARI, a Japanese IR space telescope with Korea and ESA participation. High redshift QSOs hold an important key to the understanding of the growth of supermassive black-holes and their role in the galaxy formation. However, our understanding of high redshift QSOs has been hampered by the lack of the rest-frame optical spectra where exist the popular key spectral diagnostics to derive QSO properties such as masses of supermassive black-holes. Using the AKARI's unique spectroscopic capability at 2 - 5 micron, we observed 14 QSOs at 4.5 < z < 6.5, revealing for the first time, the optical emission lines such as Balmer lines of QSOs at z > 4.5. In this talk, we show the basic properties of high redshift QSOs derived from the rest-frame optical spectra, and discuss how such properties compare with QSOs at lower redshifts.

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