Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........17c&link_type=abstract
Ph.D. Thesis
Physics
1
Black Hole, Accretion, Ejection, Gx 339-4, Distance, Optical Extinction, Cir X-1, Sgr 1806-20, Sgr 1627-41
Scientific paper
This thesis is devoted to a multi-wavelength study of accretion-ejection phenomena around compact stars (black holes and neutron stars). The first part of this manuscript describes problems related to the determination of the distance and the optical extinction to compact objects -- fondamental parameters for the evaluation of the energy budget of these systems. To this end, the structure and the dynamics of the Galaxy are studied by observations of the atomic and molecular gas along the line of sight to compact stars. This method leads to the first evaluation of the distance to two Soft Gamma Repeaters: SGR 1806-20 and SGR 1627-41. We then draw some conclusions on the nature of these sources of recurrent gamma-ray bursts. The above method is then applied to two X-ray binaries: Cir X-1 and GX 339-4. In the second part of this thesis, we present a multi-wavelength study of the Galactic black hole candidate GX 339-4. We first discuss the characteristics of the radio emission from GX 339-4. In 1998, GX 339-4 underwent a transition to a soft-high X-ray state and observations in three wavelength regimes (radio, soft and hard X-rays) revealed new patterns of behaviour. This allowed us to constrain the region of origin of the radio emission (a compact jet) in GX 339-4 and allowed a better understanding of the physical coupling between accretion and ejection in GX 339-4. An analogy with the black hole candidate Cyg X-1 is then presented. Finally, these results are discussed in the context of microquasars and active galactic nuclei in order to gain a deeper insight into the accretion - ejection coupling around compact objects.
No associations
LandOfFree
Many faces of compact objects: distance, optical extinction and multi-wavelength behaviour 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 Many faces of compact objects: distance, optical extinction and multi-wavelength behaviour, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Many faces of compact objects: distance, optical extinction and multi-wavelength behaviour will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1544418