AAS 198th Meeting, June 2001
Session 17. Galaxies: Chandra's Perspective
Oral, Monday, June 4, 2001, 10:00-11:30am, C101-103

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[17.04] Chandra HETGS X-ray Spectroscopy of NGC 1068

P. M. Ogle (U. C. Santa Barbara), C. R. Canizares, H. L. Marshall, J. C. Lee, D. Dewey (MIT)

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.

The author(s) of this abstract have provided an email address for comments about the abstract: pmo@xmmom.physics.ucsb.edu

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