SIMBAD references

2013ApJ...762...80T - Astrophys. J., 762, 80 (2013/January-2)

The global implications of the hard X-ray excess in type 1 active galactic nuclei.


Abstract (from CDS):

Recent evidence for a strong "hard excess" of flux at energies ≳ 20 keV in some Suzaku observations of type 1 active galactic nuclei (AGNs) has motivated an exploratory study of the phenomenon in the local type 1 AGN population. We have selected all type 1 AGNs in the Swift Burst Alert Telescope 58 month catalog and cross-correlated them with the holdings of the Suzaku public archive. We find the hard excess phenomenon to be a ubiquitous property of type 1 AGNs. Taken together, the spectral hardness and equivalent width of Fe Kα emission are consistent with reprocessing by an ensemble of Compton-thick clouds that partially cover the continuum source. In the context of such a model, ∼80% of the sample has a hardness ratio consistent with >50% covering of the continuum by low-ionization, Compton-thick gas. A more detailed study of the three hardest X-ray spectra in our sample reveal a sharp Fe K absorption edge at ∼7 keV in each of them, indicating that blurred reflection is not responsible for the very hard spectral forms. Simple considerations place the distribution of Compton-thick clouds at or within the optical broad-line region.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - X-rays: galaxies

Simbad objects: 49

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2013ApJ...762...80T and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact