NuSTAR Survey of Obscured Swift/BAT-selected Active Galactic Nuclei. II. Median High-energy Cutoff in Seyfert II Hard X-Ray Spectra

Baloković, M.; Harrison, F. A.; Madejski, G.; Comastri, A.; Ricci, C.; Annuar, A.; Ballantyne, D. R.; Boorman, P.; Brandt, W. N.; Brightman, M.; Gandhi, P.; Kamraj, N.; Koss, M. J.; Marchesi, S.; Marinucci, A.; Masini, A.; Matt, G.; Stern, D.; Urry, C. M.

doi:10.3847/1538-4357/abc342

Title: NuSTAR Survey of Obscured Swift/BAT-selected Active Galactic Nuclei. II. Median High-energy Cutoff in Seyfert II Hard X-Ray Spectra

Journal Article · Thu Dec 10 00:00:00 EST 2020 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/abc342· OSTI ID:1768616

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Yale Univ., New Haven, CT (United States). Yale Center for Astronomy & Astrophysics; Yale Univ., New Haven, CT (United States); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States). Black Hole Initiative
California Institute of Technology (CalTech), Pasadena, CA (United States). Cahill Center for Astronomy and Astrophysics
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology
OAS Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (Italy)
Univ. Diego Portales, Santiago (Chile); Peking Univ., Beijing (China). Kavli Inst. for Astronomy and Astrophysics
Univ. Kebangsaan Malaysia, Selangor (Malaysia)
Georgia Inst. of Technology, Atlanta, GA (United States)
Univ. of Southampton (United Kingdom); Czech Academy of Sciences, Prague (Czech Republic). Astronomical Inst.
Pennsylvania State Univ., Philadelphia, PA (United States); Pennsylvania State Univ., Philadelphia, PA (United States). Davey Lab.
Univ. of Southampton (United Kingdom)
Eureka Scientific Inc., Oakland, CA (United States)
OAS Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (Italy); Clemson Univ., SC (United States). Kinard Lab. of Physics
Agenzia Spaziale Italiana (ASI), Rome (Italy)
Scuola Internazionale Superiore di Studi Avanzati, Trieste (Italy)
Univ. degli Studi Roma Tre, Rome (Italy)
California Institute of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab. (JPL)
Yale Univ., New Haven, CT (United States). Yale Center for Astronomy & Astrophysics; Yale Univ., New Haven, CT (United States)

Broadband X-ray spectroscopy of the X-ray emission produced in the coronae of active galactic nuclei (AGNs) can provide important insights into the physical conditions very close to their central supermassive black holes. The temperature of the Comptonizing plasma that forms the corona is manifested through a high-energy cutoff that has been difficult to directly constrain even in the brightest AGN because it requires high-quality data at energies above 10 keV. In this paper we present a large collection of coronal cutoff constraints for obscured AGNs based on a sample of 130 AGNs selected in the hard X-ray band with Swift/BAT and observed nearly simultaneously with NuSTAR and Swift/XRT. Additionally, we find that under a reasonable set of assumptions regarding partial constraints the median cutoff is well constrained to 290 ± 20 keV, where the uncertainty is statistical and given at the 68% confidence level. We investigate the sensitivity of this result to our assumptions and find that consideration of various known systematic uncertainties robustly places the median cutoff between 240 and 340 keV. The central 68% of the intrinsic cutoff distribution is found to be between about 140 and 500 keV, with estimated uncertainties of 20 and 100 keV, respectively. In comparison with the literature, we find no clear evidence that the cutoffs in obscured and unobscured AGNs are substantially different. Our analysis highlights the importance of carefully considering partial and potentially degenerate constraints on the coronal high-energy cutoff in AGNs.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; National Aeronautics and Space Administration (NASA); ASI/INAF

Grant/Contract Number:: AC02-76SF00515; NNX14AQ07H; GBMF8273; 19-05599Y; I/037/12/0

OSTI ID:: 1768616

Journal Information:: The Astrophysical Journal (Online), Vol. 905, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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