Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..267k&link_type=abstract
6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce
Astronomy and Astrophysics
Astronomy
Scientific paper
ROSAT and Chandra-observations have discovered several ultra-luminous X-ray sources (ULXs) exceeding luminosities of 5 times 1039 ergs. Assuming isotropic emission, these sources should obey the Eddington limit, requiring the existence of intermediate-mass black holes of 20-500 Msun. However, the measured inner disk temperatures are too high for these masses and there is no convincing creation mechanism known for these objects. Recently, Markoff, Falcke, Fender (2001) suggested that jets could be dominantly contributing to the hard X-ray emission from X-ray binaries (XRB) at least in the Low/Hard State, meaning that some X-ray sources could be beamed. A beaming model would reduce the required black hole masses for ULXs to normal values. To test the hypothesis of beamed emission we consider a simple population synthesis model for XRBs, where the X-ray emission is produced by both a jet (beamed) and an accretion disk (isotropic). The model is tested on a combined dataset of X-ray point sources of nearby galaxies. It can explain the known population of ULXs with M < 15 Modot and bulk Lorentz factors for jets of γj ˜5. If this is true, the ULXs would be the stellar-mass analogues to blazars in the Universe.
Falcke Heino
Kording Elmar
Markoff Sera
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