Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap%26ss.248..141w&link_type=abstract
Astrophysics and Space Science, Volume 248, Issue 1-2, pp. 141-148
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
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.
Elvis Martin
Wilson Andrew S.
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