BAT AGN Spectroscopic Survey. V. X-Ray Properties of the Swift/BAT 70-month AGN Catalog

By C. Ricci, B. Trakhtenbrot, M. Koss, Y. Ueda, I. Delvecchio, E. Treister, Kevin Schawinski, Stéphane Paltani, K. Oh, I. Lamperti and 11 more. 2017

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Hard X-ray (≥10 keV) observations of active galactic nuclei (AGNs) can shed light on some of the most obscured episodes of accretion onto supermassive black holes. The 70-month Swift/BAT all-sky survey, which probes the 14–195 keV energy range, has currently detected 838 AGNs. We report here on the broadband X-ray (0.3–150 keV) characteristics of these AGNs, obtained by combining XMM-Newton, Swift/XRT, ASCA, Chandra, and Suzaku observations in the soft X-ray band ( keV) with 70-month averaged Swift/BAT data. The nonblazar AGNs of our sample are almost equally divided into unobscured ( ) and obscured ( ) AGNs, and their Swift/BAT continuum is systematically steeper than the 0.3–10 keV emission, which suggests that the presence of a high-energy cutoff is almost ubiquitous. We discuss the main X-ray spectral parameters obtained, such as the photon index, the reflection parameter, the energy of the cutoff, neutral and ionized absorbers, and the soft excess for both obscured and unobscured AGNs.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/8ce7a8c48eba907f317c3d1b0804f619ff9e0c61

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Citations in the corpus

The 105-Month Swift-BAT All-sky Hard X-Ray Survey (2018, background): “The INTEGRAL-IBIS found secure counterparts to 369 AGN from the first 1000 orbits (2002-2010, Bird et al. 2016) while the Swift -BAT 70 month survey catalog identified 872 AGN to BATdetected sources (Ricci et al. 2017a).”
Obscured Active Galactic Nuclei (2018, background): “However, recent studies report a possible connection between galaxy mergers and Compton-thick AGN obscuration (Kocevski et al. 2015; Ricci et al. 2017a).”
New Spectral Model for Constraining Torus Covering Factors from Broadband X-Ray Spectra of Active Galactic Nuclei (2018, background): “It has been suggested that the covering factor depends on the Eddington ratio (e.g., Ezhikode et al. 2017, Buchner & Bauer 2017, Ricci et al. 2017b), and that its dependence on luminosity or the Eddington ratio changes with redshift (e.g., Aird et al. 2015, Buchner et al. 2015).”
x-cigale: fitting AGN/galaxy SEDs from X-ray to infrared (2020, background): “We set Ecut = 300 keV, the typical value from the observations of Seyferts (e.g. Dadina 2008; Ricci et al. 2017).”
Universal bolometric corrections for active galactic nuclei over seven luminosity decades (2020, methodology): “To have measurements that are as homogeneous as possible, we rescaled the BH mass values of the Swift sample by assuming the same virial factor ( f = 5.5) as for the other samples (instead of f = 4.31 as in Ricci et al. 2017c).”