Query : 2005A&A...442..795Z

2005A&A...442..795Z - Astronomy and Astrophysics, volume 442, 795-799 (2005/11-2)

Direct measurements of black hole charge with future astrometrical missions.


Abstract (from CDS):

Recently, Zakharov et al. (2005NewA...10..479Z) considered the possibility of evaluating the spin parameter and the inclination angle for Kerr black holes in nearby galactic centers by using future advanced astrometrical instruments. A similar approach which uses the characteristic properties of gravitational retro-lensing images can be followed to measure the charge of a Reissner-Nordstroem black hole. Indeed, in spite of the fact that their formation might be problematic, charged black holes are objects of intensive investigations. From a theoretical point of view, it is well-known that a black hole is described by only three parameters, namely, its mass M, angular momentum J, and charge Q. Therefore, it would be important to have a method for measuring all these parameters, preferably by independent model of any. In this paper, we propose a procedure to measure the black hole charge by using the size of the retro-lensing images that can be revealed by future astrometrical missions. A discussion of the Kerr-Newmann black hole case is also offered.

Abstract Copyright:

Journal keyword(s): black hole physics - astrometry - gravitation - gravitational lensing - galaxies: nuclei

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13665 0
2 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4135 3

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