| Issue |
A&A
Volume 371, Number 1, May III 2001
|
|
|---|---|---|
| Page(s) | 93 - 96 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20010336 | |
| Published online | 15 May 2001 | |
A new mechanism for soft X-ray excess in NGC 5548
Center for Astrophysics, University of Science and Technology of China, Hefei, 230026 Anhui, PR China National Astronomical Observatories, Chinese Acadamy of Sciences (NAOCAS), 100012 Beijing, PR China
Corresponding author: J.-L. Zhang, jlz@ustc.edu.cn
Received:
20
November
2000
Accepted:
12
January
2001
Many active galaxies exhibit soft X-ray excess in the 0.2-2 keV
band with a photon index 
, much
higher than that of the hard X-ray (2-10 keV) band with 
. Different theoretical models have been proposed to
reproduce and explain the spectra, but the complexity of all these
models tends to make the situation even more confused. Here we
present results using our newly-proposed synchro-curvature
mechanism, which we show can reproduce the soft X-ray excess by a
simple fitting process. Such a model may be helpful in considering
the physical processes taking place in these objects.
Key words: galaxies: individual: NGC 5548 / radiation mechanisms: non-thermal / magnetic fields / X-rays: galaxies
© ESO, 2001
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