Accretion disk luminosity for black holes surrounded by dark matter

Abstract

We consider the observational properties of a static black hole space-time immersed in a dark matter envelope. We thus investigate how the modifications to geometry, induced by the presence of dark matter affect the luminosity of the black hole's accretion disk. We show that the same disk's luminosity produced by a black hole in vacuum may be produced by a smaller black hole if surrounded by dark matter under certain conditions. In particular, we demonstrate that the luminosity of the disk is markedly altered by dark matter's presence, suggesting that mass estimation of distant super-massive black holes may be changed if they are immersed in dark matter. We argue that a similar effect holds in more realistic scenarios and we discuss about the refractive index related to dark matter lensing. Hence we show how this may help explain the observed luminosity of super-massive black holes in the early universe.

arXiv comment9 pages, 9 figures

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• Constraining primordial black holes as a fraction of dark matter through accretion disk luminosity
• Particle dynamics and the accretion disk around a Self-dual Black Hole immersed in a magnetic field in Loop Quantum Gravity
• Thermodynamics of static and stationary black holes in Einstein-Gauss-Bonnet gravity with dark matter
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• Accreting Black Holes in Dark Matter Halos
• Thin Accretion Disk Around Rotating Hairy Black Hole: Radiative Property and Optical Appearance
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• Luminosity of accretion disks in compact objects with quadrupole