منابع مشابه
Compton-thick Accretion in the Local Universe
Heavily obscured accretion is believed to represent an important stage in the growth of supermassive black holes, and to play an important role in shaping the observed spectrum of the Cosmic X-ray Background (CXB). Hard X-ray (E>10keV) selected samples are less affected by absorption than samples selected at lower energies, and are therefore one of the best ways to detect and identify Compton-t...
متن کاملThe Compton-thick AGN in the CDFN
We present X-ray spectral analysis of the brightest sources (f2−10 keV > 10 −15 erg cm s ) in the Chandra Deep Field North. Our sample consists of 222 sources; for the vast majority (171) either a spectroscopic or a photometric redshift is available. Our goal is to discover the Compton-thick AGN in a direct way i.e. through their X-ray spectra. Compton-thick AGN give away their presence in X-ra...
متن کاملPenetrating the Deep Cover of Compton Thick Active Galactic Nuclei
We analyze observations obtained with the Chandra X-ray Observatory of bright Compton thick active galactic nuclei (AGNs), those with column densities in excess of 1.5 × 10 cm along the lines of sight. We therefore view the powerful central engines only indirectly, even at X-ray energies. Using high spatial resolution and considering only galaxies that do not contain circumnuclear starbursts, w...
متن کاملX–ray spectra transmitted through Compton–thick absorbers
The presence of large amount of “cold” (i.e. not much ionized, and substantially opaque in X–rays) matter around Active Galactic Nuclei is now a well established fact. For all Seyfert 2 galaxies observed in X–rays so far there is evidence for absorption in excess of the Galactic one. In a significant fraction of them, the column density of the absorbing matter exceeds 10 cm−2 (Maiolino et al. 1...
متن کاملThe X–ray Spectrum of Compton–thick Seyfert 2 Galaxies
Current ideas on the X–ray spectrum of Compton–thick Seyfert 2 galaxies are reviewed, and a brief description of the four presently known sources of this class are given.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2018
ISSN: 1538-4357
DOI: 10.3847/1538-4357/aaa410