EAS Publications Series
Volume 7, 2003Final Stages of Stellar Evolution
|Page(s)||39 - 39|
|Published online||15 May 2003|
C. Motch and J.-M. Hameury
EAS Publications Series, 7 (2003) 39
X- and Gamma-Ray Continuum Emission Processes
C.E.S.R, 9 Av. du Colonel Roche, 31028 Toulouse, France
Compact objects, the ultimate stage of evolution of massive stars, are strong X- and gamma-ray emitters. The compact object (white dwarf, neutron star, or black hole) accretes matter and electromagnetic fields from the close environment. During this process, a part of the gravitational potential energy is reprocessed into kinetic energy in the magnetised fluid. The interplay of turbulence and/or shock generation allows a fraction of this energy to be transfered to a tiny supra-thermal particle population and ultimately to be radiated away into high energy photons. The radiation can be produced in a limited number of ways: cyclo-synchrotron and bremsstrahlung processes; the Compton effect; nuclear interactions and pair creation/absorption. This lecture presents the main properties of the aforementioned mechanisms and illustrates them in some astrophysical situations.
© EAS, EDP Sciences, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.