SIMBAD references

2000ApJ...536..718N - Astrophys. J., 536, 718-728 (2000/June-3)

A long observation of NGC 5548 by BeppoSAX: the high-energy cutoff, intrinsic spectral variability, and a truly warm absorber.

NICASTRO F., PIRO L., DE ROSA A., FEROCI M., GRANDI P., FIORE F., ELVIS M., HAARDT F., KAASTRA J., MALIZIA A., MARASCHI L., MATT G., PEROLA G.C. and PETRUCCI P.O.

Abstract (from CDS):

NGC 5548 was observed by BeppoSAX in a single long (8 day) observation from 0.2 to 200 keV. We find (1) spectral variation of the source produced by a change of the intrinsic power-law slope; (2) a high-energy cutoff at Ec=115+39–27 keV with a hint of change of Ec with flux; and (3) O VII and O VIII absorption K edges and a possible blended O VII-O VIII Kα,β emission feature at 0.54+0.07–0.06 keV, inconsistent with a purely photoionized gas in equilibrium. We propose that the temperature of the absorbing and emitting gas is ∼106 K so that both collisional ionization and photoionization contribute.

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Journal keyword(s): Galaxies: Individual: NGC Number: NGC 5548 - Galaxies: Seyfert - Radiation Mechanisms: Thermal - X-Rays: Galaxies

Simbad objects: 2

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