Galactic ultraluminous X-ray sources - microquasars or intermediate mass black holes

Details Galactic ultraluminous X-ray sources - microquasars or intermediate mass black holes Galactic ultraluminous X-ray sources - microquasars or intermediate mass black holes

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phyu...49...20f&link_type=abstract

Physics Uspekhi, Volume 49, pp. 20-25

Astronomy and Astrophysics

Astronomy

X-Ray Astronomy, Black Holes, Supercritical Accretion Discs

Scientific paper

The ultraluminous X-ray sources (ULXs) were isolated in galaxies. We describe properties of this new class of X-ray sources. There are two models for the ULXs, 1) they are supercritical accretion disks around a stellar mass black hole like that in SS433, observed close to the disk axes, and 2) they are Intermediate Mass Black Holes (of 100-10000 solar masses). We compare observed properties of the ULXs with those of SS433, the supercritical accretion disk, jets and the nebula W50 surrounding SS433. At least in three ULX nebulae (NGC6946 ULX-1, Holmberg II ULX-1 and IC342 ULX-1 the gas radial velocity gradients of 50-100 km/s on scales 20-100 pc have been detected. They suggest that the nebulae are dynamically disturbed by jets or strong winds. The nebulae are very likely to be fed by the central obect. In some ULX nebulae an additional source of hard UV radiation (as luminous as the X-ray source) is necessary to explain the nebulae lines. Both the supercritical disk properties and the middle geometrical funneling of the radiation allow us to expect apparent X-ray luminosity of face-on SS433 stars up to 10^{41} erg/s. To estimate the outcoming X-ray spectrum from the supercritical disk funnel, we describe a simplified funnel model (MCF, the multicolor funnel). The model predicts a very complex X-ray absorption spectrum, consisting of blends of shallow and very broad blue-shifted absorption lines and edges of Lα/Lc transitions of the most abundant elements.

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