Körding, Falcke, Markoff 2001: Microblazars
Population X: Are the super-Eddington X-ray sources beamed jets
in microblazars or intermediate mass black holes?
Elmar Körding, Heino Falcke, Sera Markoff
Max-Planck-Institut für Radioastronomie, Auf den Hügel 69, D-53121 Bonn, Germany
(koerding, hfalcke, firstname.lastname@example.org)
Recent X-ray observations reveal an increasing number of X-ray sources
in nearby galaxies exceeding luminosities of
Lx>2*1039 erg/s. Assuming isotropic emission,
the Eddington limit suggests a population of intermediate-mass black
holes of Mbh>>10 Mo. However,
Markoff, Falcke, & Fender (2001) 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 Mo<10 and bulk Lorentz factors for jets in
microquasars of gammaj~5. Alternatively, intermediate
mass black holes up to 1000 Mo are required which are
distributed in a powerlaw with roughly dN/dM ~ M-2.
Paper: Available in PostScript and (AA)LaTex. Please send an email request to email@example.com
for a preprint.
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Questions: Heino Falcke, firstname.lastname@example.org