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

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

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...371...93x&link_type=abstract

Astronomy and Astrophysics, v.371, p.93-96 (2001)

Astronomy and Astrophysics

Astrophysics

4

Galaxies: Individual: Ngc 5548, Radiation Mechanisms: Non-Thermal, Magnetic Fields, X-Rays: Galaxies

Scientific paper

Many active galaxies exhibit soft X-ray excess in the 0.2-2 keV band with a photon index alpha_s ~ 2.38 +/- 0.25, much higher than that of the hard X-ray (2-10 keV) band with alphah ~ 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.

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