Flux enhancement in the inner region of a geometrically and optically thick accretion disk

Abstract

The surface flux (and the corresponding observed flux) of a geometrically thick ``funnel'' shaped disk is computed taking into account the radiation impinging on the surface from other parts of the disk. It is found that the ratio of the maximum apparent luminosity to the real luminosity of the disk is only a factor $\approx 5$ even when the opening angle of the disk is small ($\approx 15^o$). Thus, geometrically beamed emission from ``funnel'' shaped sub-Eddington disks around stellar mass black holes, cannot explain the Ultra-Luminous X-ray sources detected in nearby galaxies.

arXiv commentaccepted for publication in ApJ

References in corpus (14)

• Massive Black Holes as Population III Remnants
• Ultraluminous X-Ray Sources in External Galaxies
• The runaway growth of intermediate-mass black holes in dense star clusters
• The Nature of Accreting Black Holes in Nearby Galaxy Nuclei
• Super-Eddington Fluxes from Thin Accretion Disks?
• Chandra High-Resolution Camera Observations of the Luminous X-Ray Source in the Starburst Galaxy M82
• A ROSAT HRI survey of bright nearby galaxies
• Discovery of a Luminous, Variable, Off-Center Source in the Nucleus of M82 with the Chandra HRC
• A Catalog of Candidate Intermediate-luminosity X-ray Objects
• The X-ray Luminosity Function of "The Antennae" Galaxies (NGC4038/39) and the Nature of Ultra-Luminous X-ray Sources
• Discovery of Spectral Transitions from Two Ultra-Luminous Compact X-Ray Sources in Ic342
• Do the Spectra of Soft X-ray Transients Reveal Bulk Motion Inflow Phenomenon?
• Formation of intermediate-mass black holes in circumnuclear regions of galaxies
• The High-Energy Spectra of Accreting Black Holes: Observational Evidence for Bulk-Motion Infall

Cited by in corpus (12)

• Intermediate-Mass Black Holes
• Comptonization in Super-Eddington Accretion Flow and Growth Timescale of Supermassive Black Holes
• A 62 Day X-Ray Periodicity and an X-Ray Flare from the Ultraluminous X-Ray Source in M82
• Chandra observations of five ultraluminous X-ray sources in nearby galaxies
• The Time-Variable Ultra-Luminous X-ray Sources of "The Antennae"
• Accretion Disk Spectra of the Brightest Ultra-luminous X-ray Source in M82
• Geometrical Effect of Supercritical Accretion Flows: Observational Implications of Galactic Black-Hole Candidates and Ultraluminous X-ray Sources
• Quasar Microlensing Variability Studies Favor Shallow Accretion Disk Temperature Profiles
• The dependence of the estimated luminosities of ULX on spectral models
• The Unusual Spectrum of the Ultra Luminous X-ray Source, M82 X-1
• Have we detected the most luminous ULX so far?
• The spectral and temporal properties of an Ultra-Luminous X-ray source in NGC 6946