@article{aba6a9da0b544a0d838b81923ab5f4d6,
title = "Morphology of AGN emission-line regions in SDSS-IV MaNGA survey",
abstract = "Extended narrow-line regions (NLRs) around active galactic nuclei (AGN) are shaped by the distribution of gas in the host galaxy and by the geometry of the circumnuclear obscuration, and thus they can be used to test the AGN unification model. In this work, we quantify the morphologies of the NLRs in 308 nearby AGN (z = 0 - 0.14, Lbol∼1042.4-44.1 erg s-1) from the MaNGA survey. Based on the NLR maps, we find that a large fraction (81 per cent) of these AGN have bi-conical NLR morphology. The distribution of their measured opening angles suggests that the intrinsic opening angles of the ionization cones have a mean value of 85°-98° with a finite spread of 39°-44° (1σ). Our inferred opening angle distribution implies a number ratio of type I to type II AGN of 1:1.6-2.3, consistent with other measurements of the type I/type II ratio at low AGN luminosities. Combining these measurements with the WISE photometry data, we find that redder mid-IR colour (lower effective temperature of dust) corresponds to stronger and narrower photoionized bicones. This relation is in agreement with the unification model that suggests that the bi-conical NLRs are shaped by a toroidal dusty structure within a few pc from the AGN. Furthermore, we find a significant alignment between the minor axis of host galaxy discs and AGN ionization cones. Together, these findings suggest that obscuration on both circumnuclear (∼pc) and galactic (∼kpc) scales is important in shaping and orienting the AGN NLRs.",
keywords = "galaxies: Seyfert, galaxies: active, galaxies: general, galaxies: structure",
author = "Zhicheng He and Sun, {Ai Lei} and Zakamska, {Nadia L.} and Dominika Wylezalek and Michael Kelly and Greene, {Jenny E.} and Rembold, {Sandro B.} and Rog{\'e}rio Riffel and Riffel, {Rogemar A.}",
note = "Funding Information: We would like to thank Guilin Liu for useful discussion. ZH is supported by China Scholarship Council (CSC, NO. 201706340030) during his stay at the Johns Hopkins University. ZH acknowledges the grant from the National Natural Science Foundation of China (No. 11673020 and NO. 11421303) and the Ministry of Science and Technology of China (National Key Program for Science and Technology Research and Development, NO. 2016YFA0400700). NLZ acknowledges support by the Johns Hopkins University provided through the Catalyst award. RR thanks CNPq and FAPERGS for partially funding this project. RAR acknowledges support from FAPERGS (projects NO 16/2551-0000 and 17/2551-0001) and CNPq (project NO 303373/2016-4). Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High- Performance Computing at the University of Utah. The SDSS web site is www.sdss.org. SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrof{\'i}sica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU) / University of Tokyo, Lawrence Berkeley National Laboratory, Leibniz Institut f{\"u}r Astrophysik Potsdam (AIP), Max-Planck-Institut f{\"u}r Astronomie (MPIA Heidelberg), Max-Planck-Institut f{\"u}r Astrophysik (MPA Garching), Max-Planck-Institut f{\"u}r Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observat{\'a}rio Nacional / MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Aut{\'o}noma de M{\'e}xico, University of Arizona, University of colourado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia,University ofWashington, University of Wisconsin, Vanderbilt University, and Yale University. This publication makes use of data products from the Widefield 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. Funding Information: We would like to thank Guilin Liu for useful discussion. ZH is supported by China Scholarship Council (CSC, NO. 201706340030) during his stay at the Johns Hopkins University. ZH acknowledges the grant from the National Natural Science Foundation of China (No. 11673020 and NO. 11421303) and the Ministry of Science and Technology of China (National Key Program for Science and Technology Research and Development, NO. 2016YFA0400700). NLZ acknowledges support by the Johns Hopkins University provided through the Catalyst award. RR thanks CNPq and FAPERGS for partially funding this project. RAR acknowledges support from FAPERGS (projects NO 16/2551-0000 and 17/2551-0001) and CNPq (project NO 303373/2016-4). Funding Information: Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS web site is www.sdss.org. Funding Information: This publication makes 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. Publisher Copyright: {\textcopyright} 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2018",
month = aug,
day = "11",
doi = "10.1093/mnras/sty1322",
language = "English (US)",
volume = "478",
pages = "3614--3626",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",
}