Physics – Condensed Matter – Statistical Mechanics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..337c&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
The Radio source at the galactic center, Sag A*, is an excellent candidate for a black hole; the flat submm spectrum with synchrotron emission, requires high compactness. However, its radiation intensity is orders of magnitude weaker. Several observations indicate non-homogeneous source structure: Different core sizes at different mm wavelengths; different variability at submm and radio wavelengths; varying simultaneous spectra indices. The radial velocities of the molecular hydrogen emission regions, straddling the galactic center, exhibit an asymmetry between the two peaks, corresponding to a radial velocity component of 40 km /s, with respect to the sun. But no such effect is noticeable from the distribution of radial velocities of the OH / IR stars around the galactic center; indicative of a rotation around the galactic center, with practically no offset in radial velocity. An interpretation of the radial asymmetry is that it is due to the orbital motion of a black hole. In this context we model analytically a binary black hole. Using the variational principle (adopted from the semi-classical approach) a criterion is formulated which tends towards energy minimization and (analytical) gravity softening., to study the orbital motion of the pair. An analysis of the expected distribution of the orbital parameters, on the basis of statistical mechanics, indicates that the system is characterized by a state preferring high eccentricities. The system is found to slowly circularize its orbit in the adiabatic regimen, but in a large timescale; this is confirmed by numerical simulations. Thus the separation of the two black holes will decrease very gradually, followed by coalescence; after which a new pair of black holes is likely to be established. The system is found to have a poor accretion efficiency; as the accretion rate varies radially and accretion disks turn out to be meager. The model explains the low radiational intensity of Sag A*.
No associations
LandOfFree
Analytical binary black hole model of Sgr A* and its implications does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Analytical binary black hole model of Sgr A* and its implications, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analytical binary black hole model of Sgr A* and its implications will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1082700