English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Conference Paper

X- and gamma ray emission from intra-day variables

MPS-Authors
/persons/resource/persons31114

Tsang,  Olivia
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons30680

Kirk,  John G.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Tsang, O., & Kirk, J. G. (n.d.). X- and gamma ray emission from intra-day variables. In The 6th INTEGRAL Workshop "The Obscured Universe". ESA's Publication Division.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7FAB-3
Abstract
We re-examined the brightness temperature (T_B)problem posed by intra-day variables (IDV's) such as S5 0716+714, which often display T_B>10^{12} K, far exceed the limit imposed by inverse Compton cooling. Several of such IDV's have also shown a high degree of circular polarisation (CP) of the order of ~1%, much higher that predicted by the conventional synchrotron theory. We adopted a synchrotron model that replaces the conventional power-law electron spectrum with a mono-energetic electron distribution, and found that a brightness temperature as high as T_B~10^{14} K can be reached with a moderate Doppler factor of D~10. The predicted intrinsic degree of CP is of the order of 1%, in agreement with observations. With a predicted spectrum of I_\nu\propto\nu^{1/3} between the radio and the infra-red frequencies, this model provides a good spectral fit to the IDV S5 0716+714 in the radio band.