Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 480, Issue 3, Pages 3689-3701Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2081
Keywords
accretion, accretion discs; black hole physics; galaxies: individual: Mrk 766; galaxies: Seyfert
Categories
Funding
- Science and Technology Facilities Council (STFC)
- ERC Advanced Grant FEEDBACK [340442]
- National Aeronautics and Space Administration
- ESA Member States
- NASA
- Faculty of the European Space Astronomy Centre (ESAC)
- STFC [ST/N004027/1] Funding Source: UKRI
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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 NLS ls: 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 ionized 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(-4)(-1)degrees). The pure partial covering model requires extreme parameters: the cut-off of the primary continuum is very low (22(-5)(+7) keV) in one observation and the intrinsic X-ray emission must provide a large fraction (75 per cent) 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.
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