A long look at MCG-5-23-16 with NuSTAR. I. relativistic reflection and coronal properties

Publication: Research - peer-reviewJournal article – Annual report year: 2017

DOI

  • Author: Zoghbi, Abderahmen

    University of Michigan, United States

  • Author: Matt, G

    Università degli Studi Roma Tre, Italy

  • Author: Miller, J. M.

    University of Michigan, United States

  • Author: Lohfink, A. M.

    University of Cambridge, United States

  • Author: Walton, D. J.

    California Institute of Technology, United States

  • Author: Ballantyne, D. R.

    Georgia Institute of Technology, United States

  • Author: García, J. A.

    California Institute of Technology, United States

  • Author: Stern, D.

    California Institute of Technology, United States

  • Author: Koss, Michael J.

    ETH Zurich, Switzerland

  • Author: Farrah, D.

    Virginia Tech, United States

  • Author: Harrison, F. A.

    California Institute of Technology, United States

  • Author: Boggs, S. E.

    University of California at Berkeley, United States

  • Author: Christensen, Finn Erland

    Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Craig, W.

    University of California at Berkeley, United States

  • Author: Hailey, C. J.

    Columbia University, United States

  • Author: Zhang, W. W.

    NASA Goddard Space Flight Center, United States

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MCG-5-23-16 was targeted in early 2015 with a half mega-second observing campaign using NuSTAR. Here we present the spectral analysis of these data sets along with an earlier observation and study the relativistic reflection and the primary coronal source. The data show strong reflection features in the form of both narrow and broad iron lines plus a Compton reflection hump. A cutoff energy is significantly detected in all exposures. The shape of the reflection spectrum does not change in the two years spanned by the observations, suggesting a stable geometry. A strong positive correlation is found between the cutoff energy and both the hard X-ray flux and spectral index. The measurements imply that the coronal plasma is not at the runaway electron-positron pair limit, and instead contains mostly electrons. The observed variability in the coronal properties is driven by a variable optical depth. A constant heating-to-cooling ratio is measured, implying that there is a feedback mechanism in which a significant fraction of the photons cooling the corona are due to reprocessed hard X-rays.
Original languageEnglish
Article number2
JournalAstrophysical Journal
Volume836
Issue number1
Number of pages12
ISSN0004-637X
DOIs
StatePublished - 2017
CitationsWeb of Science® Times Cited: 1

    Keywords

  • Black hole physics, Galaxies: active, Galaxies: individual (MCG-5-23-16), Galaxies: Seyfert
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