Query : 2002A&A...382L..13K

2002A&A...382L..13K - Astronomy and Astrophysics, volume 382, L13-16 (2002/2-2)

Population X: Are the super-Eddington X-ray sources beamed jets in microblazars or intermediate mass black holes?


Abstract (from CDS):

Recent X-ray observations reveal an increasing number of X-ray sources in nearby galaxies exceeding luminosities of Lx>2x1039erg/s. Assuming isotropic emission, the Eddington limit suggests a population of intermediate-mass black holes of Mo≫10M. However, Markoff et al. (2001A&A...372L..25M) proposed that jets may be contributing to the X-ray emission from X-ray binaries (XRBs), implying that some X-ray sources may be relativistically beamed. This could reduce the required black hole masses to standard values. To test this hypothesis, we investigate a simple X-ray population synthesis model for X-ray point sources in galaxies with relativistic beaming and compare it with an isotropic emission model. The model is used to explain a combined data set of X-ray point sources in nearby galaxies. We show that the current distributions are consistent with black hole masses M≲10 and bulk Lorentz factors for jets in microquasars of γj∼5. Alternatively, intermediate mass black holes up to 1000M are required which are distributed in a powerlaw with roughly (dN)/(dM)∼M–2.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - accretion, accretion disks - black hole physics - radiation mechanisms: non-thermal

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11792 1
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5583 6
3 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2701 2

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