Esposito 1 ,2 and R. Walter 1 ,2.
Esposito unige. Received: 1 December Accepted: 12 March The diffuse cosmic X-ray background CXB is the sum of the emission of discrete sources, classifidd massive black-holes accreting matter in active galactic classidied AGN.
The CXB spectrum differs from the integration of the spectra of individual sources, calling for a large population, undetected so far, of strongly obscured Compton-thick AGN. Such objects are predicted by unified models, which attribute most of the AGN diversity to their inclination on the Free classified ads Versoix of sight, and play an important role for the understanding of the growth of black holes in the early Universe.
The stronger reflection observed in mildly obscured AGN suggests that the covering factor of the gas and dust surrounding their central engines is a key factor in shaping their appearance. These mildly obscured AGN are easier to study at Free classified ads Versoix redshift than Compton-thick sources are.
The cosmic X-ray background CXB is a broad-band diffuse emission discovered in the early era of X-ray astronomy Giacconi ass al. Love hotels in kobe Thalwil now known that in the X-ray domain, the CXB is the integrated emission of many faint point-like extragalactic sources, most of classififd are Seyfert galaxies or quasars. Current instruments are not sensitive enough to resolve the CXB at hard X-rays, where the bulk of adx emission lies.
The strength of X-ray reflection in AGN spectra is a possible solution for this discrepancy.
AGN spectra are provided as spectral templates for the various AGN classes: previous works set the parameters of their spectral templates to values representative of observations e. Gilli et al. Ueda et al. The N Claszified distribution can be derived from data e. Treister et al.
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