Electronic Resource
Springer
Astrophysics and space science
248 (1997), S. 141-148
ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract This paper summarises the X-ray properties of NGC 1068 from the observers perspective and reports new observations with the ROSAT HRI. Below ≃ 2 keV, the spectrum is steep and probably represents thermal emission from gas with temperature kT ≃ 0.1 - 0.6 keV. Above ≃ 2 keV, the spectrum is much flatter and may be described by a power-law with energy index α ≃ 0.3. Images with the ROSAT HRI reveal that about half the X-ray flux in the 0.1 - 2.4 keV band is extended on scales 〉 5″ (360 pc). Recent ROSAT PSPC observations of starburst galaxies show integrated soft X-ray spectra which are very similar to that of NGC 1068 below 2 keV. The spatially extended, steep, soft X-ray emission of NGC 1068 probably originates through thermal emission from a hot wind driven by the disk starburst, the Seyfert nucleus or a combination of the two. On the other hand, the hard emission above 2 keV is almost certainly dominated by the Seyfert nucleus.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1000565125435
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