Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 441, Issue 1, Pages 900-909Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu553
Keywords
accretion accretion discs; planets and satellites: formation; planet-disc interactions; protoplanetary discs; galaxies: active; galaxies: Seyfert
Categories
Funding
- NSF PAARE [AST-1153335]
- W.M. Keck Foundation Fund of the Institute for Advanced Study
- NASA [NNX11AF29G]
- National Science Foundation [AST10-09802]
- NASA through the Sagan Fellowship Program
- [NASA-APRA08-0117]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1153335] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009802] Funding Source: National Science Foundation
Ask authors/readers for more resources
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. Agap-opening IMBH in the innermost disc imprints ripples and oscillations on the broad Fe K alpha 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available