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BASS. XXX. Distribution Functions of DR2 Eddington Ratios, Black Hole Masses, and X-Ray Luminosities

The Astrophysical journal. Supplement series, 2022-07, Vol.261 (1), p.9 [Peer Reviewed Journal]

2022. The Author(s). Published by the American Astronomical Society. ;2022. The Author(s). Published by the American Astronomical Society. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 0067-0049 ;EISSN: 1538-4365 ;DOI: 10.3847/1538-4365/ac5b64

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Title:
BASS. XXX. Distribution Functions of DR2 Eddington Ratios, Black Hole Masses, and X-Ray Luminosities
Author: Ananna, Tonima Tasnim ; Weigel, Anna K. ; Trakhtenbrot, Benny ; Koss, Michael J. ; Urry, C. Megan ; Ricci, Claudio ; Hickox, Ryan C. ; Treister, Ezequiel ; Bauer, Franz E. ; Ueda, Yoshihiro ; Mushotzky, Richard ; Ricci, Federica ; Oh, Kyuseok ; Mejía-Restrepo, Julian E. ; Brok, Jakob Den ; Stern, Daniel ; Powell, Meredith C. ; Caglar, Turgay ; Ichikawa, Kohei ; Wong, O. Ivy ; Harrison, Fiona A. ; Schawinski, Kevin
Subjects: Accretion ; Active galactic nuclei ; Active galaxies ; Auroral kilometric radiation ; Black holes ; Distribution functions ; High energy astrophysics ; Luminosity ; Luminosity function ; Quasars ; Radiation ; Radiation pressure ; Red shift ; Spectroscopy ; Supermassive black holes ; X ray astronomy ; X-ray active galactic nuclei ; X-ray surveys
Is Part Of: The Astrophysical journal. Supplement series, 2022-07, Vol.261 (1), p.9
Description: Abstract We determine the low-redshift X-ray luminosity function, active black hole mass function (BHMF), and Eddington ratio distribution function (ERDF) for both unobscured (Type 1) and obscured (Type 2) active galactic nuclei (AGNs), using the unprecedented spectroscopic completeness of the BAT AGN Spectroscopic Survey (BASS) data release 2. In addition to a straightforward 1/ V max approach, we also compute the intrinsic distributions, accounting for sample truncation by employing a forward-modeling approach to recover the observed BHMF and ERDF. As previous BHMFs and ERDFs have been robustly determined only for samples of bright, broad-line (Type 1) AGNs and/or quasars, ours are the first directly observationally constrained BHMF and ERDF of Type 2 AGNs. We find that after accounting for all observational biases, the intrinsic ERDF of Type 2 AGNs is significantly more skewed toward lower Eddington ratios than the intrinsic ERDF of Type 1 AGNs. This result supports the radiation-regulated unification scenario, in which radiation pressure dictates the geometry of the dusty obscuring structure around an AGN. Calculating the ERDFs in two separate mass bins, we verify that the derived shape is consistent, validating the assumption that the ERDF (shape) is mass-independent. We report the local AGN duty cycle as a function of mass and Eddington ratio, by comparing the BASS active BHMF with the local mass function for all supermassive black holes. We also present the log N − log S of the Swift/BAT 70 month sources.
Publisher: Saskatoon: The American Astronomical Society
Language: English
Identifier: ISSN: 0067-0049
EISSN: 1538-4365
DOI: 10.3847/1538-4365/ac5b64
Source: Open Access: IOP Publishing Free Content
IOPscience (Open Access)
Alma/SFX Local Collection
DOAJ Directory of Open Access Journals

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BASS. XXX. Distribution Functions of DR2 Eddington Ratios, Black Hole Masses, and X-Ray Luminosities

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