Active Galactic Nuclei in Massive Galaxies at High Redshift

Details Active Galactic Nuclei in Massive Galaxies at High Redshift Active Galactic Nuclei in Massive Galaxies at High Redshift

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..408..445y&link_type=abstract

The Starburst-AGN Connection. ASP Conference Series, Vol. 408, proceedings of the conference held 27-31 October 2008, at Shangha

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Scientific paper

We investigate the X-ray properties of the K-band-selected galaxies at redshift 2 < z < 4 by using our deep near-infrared images obtained in the MOIRCS Deep Survey project and the published Chandra X-ray source catalog. 61 X-ray sources with the 2-10 keV luminosity L_X = 1042-1044 erg s-1 are identified with the K-selected galaxies and we found that they are exclusively (90%) associated with the massive objects with stellar mass larger than 1010.5 M_&sun;. On the other hand, the AGN detection rate among the very massive galaxies with the stellar mass larger than 1011 M_&sun; is high, 33% (26/78). The active duration in the AGN duty cycle of the high-redshift massive galaxies seems large.

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