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BASS XXX: Distribution Functions of DR2 Eddington-ratios, Black Hole Masses, and X-ray Luminosities

Ananna, Tonima Tasnim and Weigel, Anna K. and Trakhtenbrot, Benny and Koss, Michael J. and Urry, C. Megan and Ricci, Claudio and Hickox, Ryan C. and Treister, Ezequiel and Bauer, Franz E. and Ueda, Yoshihiro and Mushotzky, Richard and Ricci, Federica and Oh, Kyuseok and Mejía-Restrepo, Julian E. and den Brok, Jakob and Stern, Daniel and Powell, Meredith C. and Caglar, Turgay and Ichikawa, Kohei and Wong, O. Ivy and Harrison, Fiona A. and Schawinski, Kevin (2022) BASS XXX: Distribution Functions of DR2 Eddington-ratios, Black Hole Masses, and X-ray Luminosities. . (Unpublished)

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We determine the low-redshift X-ray luminosity function (XLF), active black hole mass function (BHMF), and Eddington-ratio distribution function (ERDF) for both unobscured (Type 1) and obscured (Type 2) active galactic nuclei (AGN) using the unprecedented spectroscopic completeness of the BAT AGN Spectroscopic Survey (BASS) data release 2. In addition to a straightforward 1/Vmax 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 is the first directly observationally constrained BHMF and ERDF of Type 2 AGN. We find that after accounting for all observational biases, the intrinsic ERDF of Type 2 AGN is significantly skewed towards lower Eddington ratios than the intrinsic ERDF of Type 1 AGN. 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 SMBH. We also present the log N-log S of Swift-BAT 70-month sources.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Ananna, Tonima Tasnim0000-0001-8211-3807
Weigel, Anna K.0000-0002-5489-4316
Trakhtenbrot, Benny0000-0002-3683-7297
Koss, Michael J.0000-0002-7998-9581
Urry, C. Megan0000-0002-0745-9792
Ricci, Claudio0000-0001-5231-2645
Hickox, Ryan C.0000-0003-1468-9526
Treister, Ezequiel0000-0001-7568-6412
Bauer, Franz E.0000-0002-8686-8737
Ueda, Yoshihiro0000-0001-7821-6715
Mushotzky, Richard0000-0002-7962-5446
Ricci, Federica0000-0001-5742-5980
Oh, Kyuseok0000-0002-5037-951X
den Brok, Jakob0000-0002-8760-6157
Stern, Daniel0000-0003-2686-9241
Powell, Meredith C.0000-0003-2284-8603
Ichikawa, Kohei0000-0002-4377-903X
Harrison, Fiona A.0000-0003-2992-8024
Schawinski, Kevin0000-0001-5464-0888
Additional Information:Attribution 4.0 International (CC BY 4.0). We thank the anonymous reviewers for their constructive comments which helped us improve the quality of this paper. T.T.A. and R.C.H. acknowledge support from NASA through ADAP award 80NSSC19K0580, and the National Science Foundation through CAREER award 1554584. B.T. acknowledges support from the Israel Science Foundation (grant number 1849/19) and from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement number 950533). M.K. acknowledges support from NASA through ADAP award NNH16CT03C. C.M.U. acknowledges support from the National Science Foundation under Grant No. AST-1715512. C.R. acknowledges support from the Fondecyt Iniciacion grant 11190831. We acknowledge support from ANID-Chile Basal AFB-170002 and FB210003 (E.T., F.E.B.), FONDECYT Regular 1200495 and 1190818 (E.T., F.E.B.), ANID Anillo ACT172033 (E.T.), Millennium Nucleus NCN19 058 (TITANs; E.T.) and Millennium Science Initiative Program - ICN12 009 (F.E.B.). K.O. acknowledges support from the National Research Foundation of Korea (NRF-2020R1C1C1005462). The work of K.I. is supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (18K13584, 20H01939). This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611. This research made use of Astropy (Astropy Collaboration et al. 2013; Price-Whelan et al. 2018), Matplotlib (Hunter 2007), Emcee (Foreman-Mackey et al. 2013), NumPy (van der Walt et al. 2011), Topcat (Taylor 2005), xpec and pyxpsec (Arnaud 1996), and ChainConsumer (Hinton 2016).
Group:Astronomy Department, Space Radiation Laboratory
Funding AgencyGrant Number
Israel Science Foundation1849/19
European Research Council (ERC)950533
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)11190831
Agencia Nacional de Investigación y Desarrollo (ANID)FB210003
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1200495
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1190818
Agencia Nacional de Investigación y Desarrollo (ANID)ACT172033
Agencia Nacional de Investigación y Desarrollo (ANID)NCN19_058
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)ICN12_009
National Research Foundation of KoreaNRF-2020R1C1C1005462
Japan Society for the Promotion of Science (JSPS)18K13584
Japan Society for the Promotion of Science (JSPS)20H01939
Record Number:CaltechAUTHORS:20220119-234014000
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113013
Deposited By: George Porter
Deposited On:20 Jan 2022 17:01
Last Modified:20 Jan 2022 17:01

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