Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...42d&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p.42-42
Astronomy and Astrophysics
Astronomy
Scientific paper
Binary star systems containing stellar mass black holes and normal stars as companions have been detected in our Galaxy over the last decade. Ejecting collimated bipolar radio jets with apparent superluminal velocities, these objects have been named microquasars thanks to their similarity with the distant extragalactic quasars. We here propose that the large scale superluminal ejections observed in these microquasars (e.g., GRS 1915+105 source) during radio flare events are produced by violent magnetic reconnection episodes in the corona just above the inner regions of the magnetized accretion disk (with ~107 G) that surrounds the central 10-solar mass black hole. The process occurs during supercritical disk mass accretion (~ 1019 g s-1), and part of the magnetic energy released by reconnection heats the coronal gas (Tc~107 K) that produces a steep, soft X-ray spectrum with luminosity LX ~1039 erg s-1, in agreement with observations. The remaining magnetic energy released goes to accelerate the particles to relativistic velocities (v ~vA c, where vA is the Alfvén speed) in the reconnection site through a first-order Fermi process. This produces a steep power-law electron distribution N(E)µE-5/2 and a corresponding synchrotron radio power-law spectrum (Snµ n-0.75) with spectral index comparable to the one observed during the flares. The ejection of the superluminal components from the microquasar has been also examined with the help of fully 3-D hydrodynamical jet simulations and the results suggest an intermittent, ballistic nature for them which is consistent both with observations and the model above.
de Gouveia dal Pino Elisabete M.
Lazarian Alex
Raga Alejandro
No associations
LandOfFree
Origin of the superluminal ejections in microquasars by violent magnetic reconnection 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 Origin of the superluminal ejections in microquasars by violent magnetic reconnection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Origin of the superluminal ejections in microquasars by violent magnetic reconnection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1665334