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A mature cluster with X-ray emission at z=2.07
R. Gobat, E. Daddi, M. Onodera +10
We report evidence of a fully established galaxy cluster at z=2.07, consisting of a ~20sigma overdensity of red, compact spheroidal galaxies spatially coinciding with extended X-ra…
The high-redshift Universe with the International X-ray Observatory
A. Comastri, P. Ranalli, R. Gilli +3
We discuss some of the main open issues related to the light-up and evolution of the first accreting sources powering high redshift luminous quasars. We discuss the perspectives of…
Hot-Dust-Poor Type 1 Active Galactic Nuclei in the COSMOS Survey
Heng Hao, Martin Elvis, Francesca Civano +13
We report a sizable class of type 1 active galactic nuclei (AGNs) with unusually weak near-infrared (1-3μm) emission in the XMM-COSMOS type 1 AGN sample. The fraction of these "hot…
Demography of obscured and unobscured AGN: prospects for a Wide Field X-ray Telescope
R. Gilli, P. Tozzi, P. Rosati +7
We discuss some of the main open issues in the evolution of Active Galactic Nuclei which can be solved by the sensitive, wide area surveys to be performed by the proposed Wide Fiel…
The Extended Chandra Deep Field-South Survey: Optical spectroscopy of faint X-ray sources with the VLT and Keck
J. D. Silverman, V. Mainieri, M. Salvato +26
We present the results of a program to acquire high-quality optical spectra of X-ray sources detected in the E-CDF-S and its central area. New spectroscopic redshifts are measured…
The bulk of the black hole growth since z~1 occurs in a secular universe: No major merger-AGN connection
Mauricio Cisternas, Knud Jahnke, Katherine J. Inskip +21
What is the relevance of major mergers and interactions as triggering mechanisms for active galactic nuclei (AGN) activity? To answer this longstanding question, we analyze 140 XMM…