Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332802m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #328.02; Bulletin of the American Astronomical Society, Vol. 41, p.384
Astronomy and Astrophysics
Astronomy
Scientific paper
X-ray observations over the last few decades have revealed numerous flaring activities on short time-scales from stellar as well as supermassive black holes such Cygnus X-1 and Sgr A*. However, the physical origin of such flares/variability is still unclear. Various physical emission processes at work near the extreme environments of these compact objects can give rise to broadband spectra ranging from radio through gamma-rays. Simultaneous multi-wavelength campaigns covering the broadest possible range of the electromagnetic spectrum have only started becoming feasible recently. Data from such campaigns hold the key in disentangling the different emission mechanisms involved. In this meeting I will present our recent work towards the development of a time-dependent model for episodic ejection of relativistic plasma within a jet framework. Taking into account the relevant heating and cooling processes within the ejected plasma, the time-dependent evolution of the particle and photon distributions are obtained by solving the continuity equation. Using data from recent broadband multi-wavelength campaigns of Cygnus X-1 and Sgr A*, we model the observed flares, allowing us to put constraints on the dynamics of the ejecta, geometry, and the underlying emission mechanism.
Bower Gary
Falcke Heino
Maitra Dipankar
Markoff Sera
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