@article{b07c5e5740df481d8e3e7c922fc9f5c2,
title = "SDSS-IV MaNGA: Identification of active galactic nuclei in optical integral field unit surveys",
abstract = "In this paper, we investigate 2727 galaxies observed by MaNGA as of 2016 June to develop spatially resolved techniques for identifying signatures of active galactic nuclei (AGNs). We identify 303 AGN candidates. The additional spatial dimension imposes challenges in identifying AGNs due to contamination from diffuse ionized gas, extraplanar gas and photoionization by hot stars. We show that the combination of spatially resolved line diagnostic diagrams and additional cuts on Hα surface brightness and Hα equivalent width can distinguish between AGN-like signatures and high-metallicity galaxies with low-ionization nuclear emission-line regions-like spectra. Low-mass galaxies with high specific star formation rates are particularly difficult to diagnose and routinely show diagnostic line ratios outside of the standard star formation locus.We develop a new diagnostic - the distance from the standard diagnostic line in the line-ratio space - to evaluate the significance of the deviation from the star formation locus. We find 173 galaxies that would not have been selected as AGN candidates based on single-fibre spectral measurements but exhibit photoionization signatures suggestive of AGN activity in the Mapping Nearby Galaxies at APO resolved observations, underscoring the power of large integral field unit surveys. A complete census of these new AGN candidates is necessary to understand their nature and probe the complex co-evolution of supermassive black holes and their hosts.",
keywords = "Galaxies: active, Galaxies: seyfert, Techniques: imaging spectroscopy, Techniques: spectroscopic",
author = "Dominika Wylezalek and Zakamska, {Nadia L.} and Greene, {Jenny E.} and Riffel, {Rogemar A.} and Niv Drory and Andrews, {Brett H.} and Andrea Merloni and Daniel Thomas",
note = "Funding Information: DW acknowledges support by the Akbari-Mack Postdoctoral Fellowship and the JHU Provost's Postdoctoral Diversity Fellowship. We thank the Lorentz Center in Leiden that hosted the workshop 'Observations and Theory of Quasar Outflows' during which many fruitful discussions took place. In particular, we thank Michael Eracleous for useful comments. This research made use of Marvin, a core PYTHON package and web framework for MaNGA data, developed by Brian Cherinka, Jos{\'e} S{\'a}nchez-Gallego and Brett Andrews (MaNGA Collaboration, 2017). Funding for the SDSS-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 (MPAGarching), Max-Planck-Institut f{\"u}r Extraterrestrische Physik (MPE), National Astronomical Observatory 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 Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University ofVirginia, University of Washington, University of Wisconsin, Vanderbilt University and Yale University Publisher Copyright: {\textcopyright} 2017 The Author(s).",
year = "2018",
month = feb,
day = "21",
doi = "10.1093/mnras/stx2784",
language = "English (US)",
volume = "474",
pages = "1499--1514",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",
}