NuSTAR observations of Mrk 766: distinguishing reflection from absorption

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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DOI

  • Author: Buisson, D. J. K.

    University of Cambridge, United Kingdom

  • Author: Parker, M. L.

    University of Cambridge, United Kingdom

  • Author: Kara, E.

    University of Maryland, College Park, United States

  • Author: Vasudevan, R. V.

    University of Cambridge, United Kingdom

  • Author: Lohfink, A. M.

    Montana State University, United States

  • Author: Pinto, Carlos

    University of Cambridge, United Kingdom

  • Author: Fabian, A. C.

    University of Cambridge, United Kingdom

  • Author: Ballantyne, D. R.

    Georgia Institute of Technology, United States

  • Author: Boggs, S. E.

    University of California at Berkeley, United States

  • Author: Christensen, F. E.

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

  • Author: Craig, W. W.

    Technical University of Denmark, Denmark

  • Author: Farrah, D.

    University of Hawaii, United States

  • Author: Hailey, C J

    Columbia University, United States

  • Author: Harrison, F. A.

    California Institute of Technology, United States

  • Author: Ricci, C.

    Universidad Diego Portales, Chile

  • Author: Stern, D.

    California Institute of Technology, United States

  • Author: Walton, D. J.

    University of Cambridge, United Kingdom

  • Author: Zhang, W. W.

    NASA Goddard Space Flight Center, United States

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We present two new NuSTAR observations of the narrow line Seyfert 1 (NLS1) galaxy Mrk 766 and give constraints on the two scenarios previously proposed to explain its spectrum and that of other NLS1s: relativistic reflection and partial covering. The NuSTAR spectra show a strong hard (>15 keV) X-ray excess, while simultaneous soft X-ray coverage of one of the observations provided by XMM-Newton constrains the ionised absorption in the source. The pure reflection model requires a black hole of high spin (a > 0.92) viewed at a moderate inclination (i=46 +1°/-4)The pure partial covering model requires extreme parameters: the cut-off of the primary continuum is very low (22+7/-5keV) in one observation and the intrinsic X-ray emission must provide a large fraction (75%) of the bolometric luminosity. Allowing a hybrid model with both partial covering and reflection provides more reasonable absorption parameters and relaxes the constraints on reflection parameters. The fractional variability reduces around the iron K band and at high energies including the Compton hump, suggesting that the reflected emission is less variable than the continuum.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume480
Issue number3
Pages (from-to)3689-3701
Number of pages14
ISSN0035-8711
DOIs
Publication statusPublished - 2018

Bibliographical note

This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record is available online at https://doi.org/10.1093/mnras/sty2081

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    Research areas

  • Accretion, Accretion discs, Black hole physics, alaxies: individual: Mrk 766, Galaxies: Seyfert

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