A new mechanism for soft X-ray excess in NGC 5548

Autor:	Tong-Sheng Xia, Jia-Lü Zhang
Rok vydání:	2001
Předmět:	Physics Soft x ray Photon Active galactic nucleus Space and Planetary Science Astrophysics::High Energy Astrophysical Phenomena ROSAT Theoretical models Astronomy and Astrophysics Quasar Astrophysics Spectral line Magnetic field
Zdroj:	Astronomy & Astrophysics. 371:93-96
ISSN:	1432-0746 0004-6361
DOI:	10.1051/0004-6361:20010336
Popis:	Many active galaxies exhibit soft X-ray excess in the 0.2-2 keV band with a photon index $\alpha _\mathrm{s} \sim 2.38 \pm 0.25$, much higher than that of the hard X-ray (2-10 keV) band with $\alpha _\mathrm{h} \sim 1.7$. 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.
Databáze:	OpenAIRE
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