Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000newa....5..299x&link_type=abstract
New Astronomy, vol. 5, no. 5, p. 299-303.
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The relativistic Doppler broadening of the line emission from both thermal and power-law particle distributions is investigated. We derive the exact analytic formulae describing the profiles. We find that the peak of the thermal line profile moves to a higher frequency than the frequency in the rest frame of emitter for the high temperature case. For a power-law particle distribution (N(gamma) prop gamma^ - p), the line profile for the particle distribution of p=2 is more like a continuum than a line, and the peak of it occurs at a higher frequency than the rest one. In the case of the high power-law index (p>2), the line profile peaks at the intrinsic frequency of the line and extends over a large frequency range in the blue wing, but sharply drops in the red wing. The analytic formulae describing the line profiles presented in this work will be potentially useful in further profile calculations on nuclear lines from different astrophysical systems.
Cao Xinwu
Xu Yong-Da
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