Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.1704o&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #17.04; Bulletin of the American Astronomical Society, Vol. 33, p.811
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on a 46 ks Chandra HETGS observation of NGC 1068. This bright, nearby (z=0.0038) Seyfert 2 galaxy is an ideal place to study the properties of the X-ray narrow-line region (NLR). It also gives us an opportunity to study the global properties of the out-flowing wind which may be seen in absorption in Seyfert 1 galaxies. We find that the spatial distribution of the X-ray emission changes with energy in our 0-order image. Similarly, the X-ray spectra of the nucleus and extended NLR are distinctly different. The nucleus of NGC 1068 emits a strong Fe K-alpha line, which may come from fluorescence in the circumnuclear torus. The spectra of the photoionized nuclear clouds are dominated by H-like and He-like recombination lines and continua. Off-nucleus, the forbidden lines are relatively weak compared to the resonance lines. This effect is especially prominent for energies E=0.8-1.3 keV. We suggest that it is due to thermal emission from the hot (T 107 K) intercloud medium which can provide pressure confinement for the cooler (T 104 K) NLR clouds. The spatial distribution of the 1 keV emission supports this interpretation.
Canizares Calude R.
Dewey Dan
Lee Jae-Chul
Marshall Herman L.
Ogle Patrick M.
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