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BAT AGN Spectroscopic Survey – XIX. Type 1 versus type 2 AGN dichotomy from the point of view of ionized outflows

Rojas, A. F. and Sani, E. and Gavignaud, I. and Ricci, C. and Lamperti, I. and Koss, M. and Trakhtenbrot, B. and Schawinski, K. and Oh, K. and Bauer, F. E. and Bischetti, M. and Boissay-Malaquin, R. and Bongiorno, A. and Harrison, F. and Kakkad, D. and Masetti, N. and Ricci, F. and Shimizu, T. and Stalevski, M. and Stern, D. and Vietri, G. (2020) BAT AGN Spectroscopic Survey – XIX. Type 1 versus type 2 AGN dichotomy from the point of view of ionized outflows. Monthly Notices of the Royal Astronomical Society, 491 (4). pp. 5867-5880. ISSN 0035-8711. doi:10.1093/mnras/stz3386.

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We present a detailed study of ionized outflows in a large sample of ∼650 hard X-ray-detected active galactic neuclei (AGNs). Using optical spectroscopy from the BAT AGN Spectroscopic Survey (BASS), we are able to reveal the faint wings of the [O III] emission lines associated with outflows covering, for the first time, an unexplored range of low AGN bolometric luminosity at low redshift (z ∼0.05). We test if and how the incidence and velocity of ionized outflow is related to AGN physical parameters: black hole mass (⁠M_(BH)⁠), gas column density (⁠N_H⁠), Eddington ratio (⁠λ_(Edd)⁠), [O III], X-ray, and bolometric luminosities. We find a higher occurrence of ionized outflows in type 1.9 (55 per cent) and type 1 AGNs (46 per cent) with respect to type 2 AGNs (24 per cent). While outflows in type 2 AGNs are evenly balanced between blue and red velocity offsets with respect to the [O III] narrow component, they are almost exclusively blueshifted in type 1 and type 1.9 AGNs. We observe a significant dependence between the outflow occurrence and accretion rate, which becomes relevant at high Eddington ratios [log(⁠λ_(Edd)⁠) ≳ −1.7]. We interpret such behaviour in the framework of covering factor-Eddington ratio dependence. We do not find strong trends of the outflow maximum velocity with AGN physical parameters, as an increase with bolometric luminosity can be only identified when including samples of AGNs at high luminosity and high redshift taken from literature.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rojas, A. F.0000-0003-0006-8681
Ricci, C.0000-0001-5231-2645
Lamperti, I.0000-0003-3336-5498
Koss, M.0000-0002-7998-9581
Trakhtenbrot, B.0000-0002-3683-7297
Schawinski, K.0000-0001-5464-0888
Oh, K.0000-0002-5037-951X
Bauer, F. E.0000-0002-8686-8737
Harrison, F.0000-0003-2992-8024
Masetti, N.0000-0001-9487-7740
Ricci, F.0000-0001-5742-5980
Shimizu, T.0000-0002-2125-4670
Stalevski, M.0000-0001-5146-8330
Stern, D.0000-0003-2686-9241
Additional Information:© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 November 27. Received 2019 October 30; in original form 2019 August 5. Published: 18 December 2019. The authors thank the anonymous referee for the constructive comments and suggestions. We are grateful to Prof. M. Elitzur for fruitful discussion on outflow statistics. We acknowledge support from the Ministry of Education, Science, and Technological Development of the Republic of Serbia through the projects Astrophysical Spectroscopy of Extragalactic Objects #176001 (MS) and Gravitation and the Large Scale Structure of the Universe #176003 (MS); CONICYT grants Basal-CATA Basal AFB-170002 (FEB, FR), FONDECYT Postdoctorado 3180506 (FR); the Ministry of Economy, Development and Tourism’s Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS (FEB); NASA through ADAP award NNH16CT03C (MK). KO acknowledges support from the Japan Society for the Promotion of Science (JSPS, ID: 17321). MB acknowledges financial support from ASI and INAF under the contract 2017-14-H.0 ASI-INAF. This research project was supported by the DFG Cluster of Excellence 'Origin and Structure of the Universe' (
Group:Space Radiation Laboratory, Astronomy Department
Funding AgencyGrant Number
Ministry of Education and Science (Serbia)176001
Ministry of Education and Science (Serbia)176003
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)3180506
Iniciativa Científica Milenio del Ministerio de Economía, Fomento y TurismoIC120009
Japan Society for the Promotion of Science (JSPS)17321
Agenzia Spaziale Italiana (ASI)2017-14-H.0
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Subject Keywords:galaxies: active – galaxies: nuclei – quasars: emission lines
Issue or Number:4
Record Number:CaltechAUTHORS:20200302-105705001
Persistent URL:
Official Citation:A F Rojas, E Sani, I Gavignaud, C Ricci, I Lamperti, M Koss, B Trakhtenbrot, K Schawinski, K Oh, F E Bauer, M Bischetti, R Boissay-Malaquin, A Bongiorno, F Harrison, D Kakkad, N Masetti, F Ricci, T Shimizu, M Stalevski, D Stern, G Vietri, BAT AGN Spectroscopic Survey – XIX. Type 1 versus type 2 AGN dichotomy from the point of view of ionized outflows, Monthly Notices of the Royal Astronomical Society, Volume 491, Issue 4, February 2020, Pages 5867–5880,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101649
Deposited By: Tony Diaz
Deposited On:02 Mar 2020 20:24
Last Modified:16 Nov 2021 18:04

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