C. Jin
Strong constraints on a super-Eddington accretion flow: XMM–Newton observations of an intermediate-mass black hole
Jin, C.; Done, C.; Ward, M.J.
Abstract
RX J1140.1+0307 is a Narrow Line Seyfert 1 (NLS1) with one of the lowest black hole masses known in an AGN (M ≤ 106 M⊙). We show results from two new XMM–Newton observations, exhibiting soft 2–10 keV spectra, a strong excess at lower energies, and fast X-ray variability which is typical of this class of AGN. The soft excess can be equally well fit using either low-temperature Comptonization or highly smeared, ionized reflection models, but we additionally consider the fast X-ray variability to produce covariance, lag and coherence spectra to show that the low-temperature Comptonization model gives a better description of the break in variability properties between soft and hard X-rays. Both these models require an additional component at the softest energies, as expected from the accretion disc. However, standard disc models cannot connect this to the optical/UV emission from the outer disc unless the mass is underestimated by an order of magnitude. The variable optical and far UV emission instead suggests that L/LEdd ∼ 10 through the outer disc, in which case advection and/or wind losses are required to explain the observed broad-band spectral energy distribution. This implies that the accretion geometry close to the black hole is unlikely to be a flat disc as assumed in the recent X-ray reverberation mapping techniques.
Citation
Jin, C., Done, C., & Ward, M. (2016). Strong constraints on a super-Eddington accretion flow: XMM–Newton observations of an intermediate-mass black hole. Monthly Notices of the Royal Astronomical Society, 455(1), 691-702. https://doi.org/10.1093/mnras/stv2319
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 5, 2015 |
Online Publication Date | Nov 5, 2015 |
Publication Date | Jan 1, 2016 |
Deposit Date | Mar 16, 2016 |
Publicly Available Date | Mar 28, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 455 |
Issue | 1 |
Pages | 691-702 |
DOI | https://doi.org/10.1093/mnras/stv2319 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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