NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-20 T22:16:51 PDT
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For refcode 2018MNRAS.476.5698Y:
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NED Abstract

Copyright by Royal Astronomical Society. 2018MNRAS.476.5698Y The absence of a thin disc in M81* Young, A. J.; McHardy, I.; Emmanoulopoulos, D.; Connolly, S. Abstract. We present the results of simultaneous Suzaku and NuSTAR observations of the nearest low-luminosity active galactic nucleus (LLAGN), M81*. The spectrum is well described by a cut-off power law plus narrow emission lines from Fe K {alpha}, Fe xxv, and Fe xxvi. There is no evidence of Compton reflection from an optically thick disc, and we obtain the strongest constraint on the reflection fraction in M81* to date, with a best-fitting value of R = 0.0 with an upper limit of R < 0.1. The Fe K {alpha} line may be produced in optically thin, N_H = 1 x 10^{23} cm^{-2}, gas located in the equatorial plane that could be the broad line region. The ionized iron lines may originate in the hot, inner accretion flow. The X-ray continuum shows significant variability on ~40 ks time-scales suggesting that the primary X-ray source is ~100 s of gravitational radii in size. If this X-ray source illuminates any putative optically thick disc, the weakness of reflection implies that such a disc lies outside a few x10^3^ gravitational radii. An optically thin accretion flow inside a truncated optically thick disc appears to be a common feature of LLAGN that are accreting at only a tiny fraction of the Eddington limit. Key words: accretion, accretion discs, galaxies: active, galaxies: individual: M81*, X-rays: galaxies
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