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• W2007934222 abstract "If intermediate-mass black holes (IMBHs) grow efficiently in gas discs around supermassive black holes, their host active galactic nucleus (AGN) discs should exhibit myriad observational signatures. Gap-opening IMBHs in AGN discs can exhibit spectral features and variability analogous to gapped protoplanetary discs. A gap-opening IMBH in the innermost disc imprints ripples and oscillations on the broad Fe Kα line which may be detectable with future X-ray missions. A non-gap-opening IMBH will accrete and produce a soft X-ray excess relative to continuum emission. An IMBH on a retrograde orbit in an AGN disc will not open a gap and will generate soft X-rays from a bow-shock ‘headwind’. Accreting IMBH in a large cavity can generate ULX-like X-ray luminosities and LINER-like optical line ratios from local ionized gas. We propose that many LINERs house a weakly accreting MBH binary in a large central disc cavity and will be luminous sources of gravitational waves (GW). IMBHs in galactic nuclei may also be detected via intermittent observational signatures including: UV/X-ray flares due to tidal disruption events, asymmetric X-ray intensity distributions as revealed by AGN transits, quasi-periodic oscillations and underluminous Type Ia supernovae. GW emitted during IMBH inspiral and collisions may be detected with eLISA and LIGO, particularly from LINERs. We summarize observational signatures and compare to current data where possible or suggest future observations." @default.
• W2007934222 created "2016-06-24" @default.
• W2007934222 creator A5000614790 @default.
• W2007934222 creator A5006405860 @default.
• W2007934222 creator A5023629992 @default.
• W2007934222 creator A5037374240 @default.
• W2007934222 creator A5051183752 @default.
• W2007934222 date "2014-05-02" @default.
• W2007934222 modified "2023-10-15" @default.
• W2007934222 title "Intermediate-mass black holes in AGN discs – II. Model predictions and observational constraints" @default.
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