Journal article · Preprint article
NuSTAR observations of Mrk 766: distinguishing reflection from absorption
University of Cambridge1
Columbia University2
California Institute of Technology3
Universidad Diego Portales4
NASA Goddard Space Flight Center5
University of Maryland, College Park6
Montana State University7
Georgia Institute of Technology8
University of California at Berkeley9
National Space Institute, Technical University of Denmark10
Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark11
Technical University of Denmark12
University of Hawaii13
...and 3 moreWe 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.
Language: | English |
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Publisher: | Royal Astronomical Society |
Year: | 2018 |
Pages: | 3689-3701 |
ISSN: | 13652966 and 00358711 |
Types: | Journal article and Preprint article |
DOI: | 10.1093/mnras/sty2081 |
ORCIDs: | 0000-0002-8466-7317 , 0000-0003-2532-7379 , 0000-0002-9378-4072 , 0000-0001-8128-6976 and Christensen, F. E. |