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SDSS-IV MaNGA: identification of active galactic nuclei in optical integral field unit surveys

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2018)

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MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 474, 期 2, 页码 1499-1514

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx2784

关键词

techniques: imaging spectroscopy; techniques: spectroscopic; galaxies: active; galaxies: seyfert

类别

Astronomy & Astrophysics

资金

  1. Akbari-Mack Postdoctoral Fellowship
  2. JHU Provost's Postdoctoral Diversity Fellowship
  3. Alfred P. Sloan Foundation
  4. U.S. Department of Energy Office of Science
  5. Center for High-Performance Computing at the University of Utah
  6. Brazilian Participation Group
  7. Carnegie Institution for Science, Carnegie Mellon University
  8. Chilean Participation Group
  9. French Participation Group
  10. Harvard-Smithsonian Center for Astrophysics
  11. Instituto de Astrofisica de Canarias
  12. Johns Hopkins University
  13. Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
  14. Lawrence Berkeley National Laboratory
  15. Leibniz Institut fur Astrophysik Potsdam (AIP)
  16. Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
  17. Max-Planck-Institut fur Astrophysik (MPA Garching)
  18. Max-Planck-Institut fur Extraterrestrische Physik (MPE)
  19. National Astronomical Observatory of China
  20. New Mexico State University
  21. New York University
  22. University of Notre Dame
  23. Observatario Nacional/MCTI
  24. Ohio State University
  25. Pennsylvania State University
  26. Shanghai Astronomical Observatory
  27. United Kingdom Participation Group
  28. Universidad Nacional Autonoma de Mexico
  29. University of Arizona
  30. University of Colorado Boulder
  31. University of Oxford
  32. University of Portsmouth
  33. University of Utah
  34. University of Virginia
  35. University of Washington
  36. University of Wisconsin
  37. Vanderbilt University
  38. Yale University

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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 Ha surface brightness and Ha 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.

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