Statistics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0708d&link_type=abstract
American Astronomical Society, HEAD meeting #11, #7.08; Bulletin of the American Astronomical Society, Vol. 41, p.661
Statistics
Scientific paper
Active Galactic Nuclei (AGN) emit over the entire electromagnetic spectrum and are widely believed to be powered by accretion of matter onto a Supermassive (million to billion) Black Hole (SMBH).
Besides being sites of "extreme" physics, AGN are likely leading actors in the formation and evolution of galaxies. Fully understanding the history of galaxy formation thus requires us to find when, where, and how SMBH grow and interact with their surroundings.
With its large collection area, broad-band energy coverage from optical/NIR to soft/hard X-ray (˜ 0.1 to 600 keV), all-sky monitoring capability, and on-board follow-up, the proposed EXIST mission provides an unrivaled census of SMBH activity especially in the local (z<0.5) universe, that is unbiased by obscuration and poor time sampling, and with enough statistics (˜ 40,000 AGN in total), to do population studies.
We report here on the AGN science enabled by the unique combination of EXIST's all-sky survey and monitoring capabilities and the factor 20 increase in hard X-ray sensitivity compared to current and prior X-ray missions.
In particular, EXIST will enable major progress in understanding: i) when and where SMBH are active in the Universe (by revealing and measuring heavily obscured accretion including the one occurring in rare, local or luminous objects), ii) the physics of accretion around SMBH (by studying their broad-band X-ray spectra and variability), and iii) the link between accretion power and jet/outflow power (by using observations of blazars). Last but not least EXIST's ability to find powerful but very rare blazars enables it to probe the appearance of the very first SMBH in the Universe, allowing us to derive the black hole mass function of distant (z>4) radio loud AGN.
Coppi Paolo
de Rosa Alessandra
della Ceca Roberto
Foschini Luca
Ghisellini Gabriele
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