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

Creators: Ricci, C.; Trakhtenbrot, B.; Koss, M. J.; Ueda, Y.; Del Vecchio, I.; Treister, E.; Schawinski, K.; Paltani, S.; Oh, K.; Lamperti, I.; Berney, S.; Gandhi, P.; Ichikawa, K.; Bauer, F. E.; Ho, L. C.; Asmus, D.; Beckmann, V.; Soldi, S.; Baloković, M.; Gehrels, N.; Markwardt, C. B.

Abstract

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 (⩽10 keV) with 70-month averaged Swift/BAT data. The nonblazar AGNs of our sample are almost equally divided into unobscured (N_H < 10^(22) cm^(-2)) and obscured (N_H ⩾ 10^(22) cm^(-2)) 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.

Additional Information

© 2017 The American Astronomical Society. Received 2016 November 10; revised 2017 August 31; accepted 2017 September 10; published 2017 December 5. This work is dedicated to the memory of our friend and collaborator Neil Gehrels. We acknowledge the work that the Swift/BAT team has done to make this project possible. We thank the anonymous referee for the prompt report that helped us improve the quality of the manuscript. We thank Taro Shimizu and Chin-Shin Chang for valuable discussion and for their help with the manuscript. This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. This work is sponsored by the Chinese Academy of Sciences (CAS), through a grant to the CAS South America Center for Astronomy (CASSACA) in Santiago, Chile. We acknowledge financial support from the CONICYT-Chile grants "EMBIGGEN" Anillo ACT1101 (C.R., E.T.), FONDECYT 1141218 (C.R.), FONDECYT 1160999 (E.T.), Basal-CATA PFB–06/2007 (C.R., E.T.), the China-CONICYT fund (C.R.), the Swiss National Science Foundation (grants PP00P2_138979 and PP00P2_166159, K.S.; grant 200021_157021, K.O.), the Swiss National Science Foundation (SNSF) through the Ambizione fellowship grant PZ00P2 154799/1 (M.K.), the National Key R&D Program of China grant No. 2016YFA0400702 (LH), the National Science Foundation of China grants No. 11473002 and 1721303 (LH), the European Union's Seventh Framework program under grant agreement 337595 (ERC Starting Grant, "CoSMass"; I.D.). Part of this work was carried out while C.R. was Fellow of the Japan Society for the Promotion of Science (JSPS) at Kyoto University. This work was partly supported by the Grant-in-Aid for Scientific Research 17K05384 (Y.U.) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT). This research has made use of the Tartarus (version 3.1) database, created by Paul O'Neill and Kirpal Nandra at Imperial College London and Jane Turner at NASA/GSFC. This publication made use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of: the SIMBAD database, operated at CDS, Strasbourg, France (Wenger et al. 2000); the Aladin sky atlas, developed at CDS, Strasbourg Observatory, France (Bonnarel et al. 2000; Boch & Fernique 2014); Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013); TOPCAT (Taylor 2005). Facilities: AKARI - , ASCA - , BeppoSAX - , Chandra - , GALEX - , IRAS - , Suzaku - , Swift - , XMM-Newton - , WISE. -

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