Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-01-07
Astrophys.J.517:661,1999
Astronomy and Astrophysics
Astrophysics
4 figures. uses aasms4.sty, accepted by ApJ, email: rmisra@iucaa.ernet.in
Scientific paper
10.1086/307209
The broad Iron line in MCG-6-30-15 is fitted to the Comptonization model where line broadening occurs due to Compton down-scattering in a highly ionized optically thick cloud. These results are compared to the disk line model where the broadening is due to Gravitational/Doppler effects in the vicinity of a black hole. We find that both models fit the data well and it is not possible to differentiate between them by fitting only the ASCA data. The best fit temperature and optical depth of the cloud are found to be kT = 0.54 keV and $\tau = 4.0$ from the Comptonization model. This model further suggests that while the temperature can be assumed to be constant, the optical depth varies during the observation period. We emphasis an earlier conclusion that simultaneous broad band data ($3 - 50$ keV) can rule out (or confirm) the Comptonization model.
Misra Rajiv
Sutaria Firoza K.
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