Chandra HETG Observations of Seyfert Galaxy NGC 4151-- The Narrow-Line Region Viewed in X-rays

Details Chandra HETG Observations of Seyfert Galaxy NGC 4151-- The Narrow-Line Region Viewed in X-rays Chandra HETG Observations of Seyfert Galaxy NGC 4151-- The Narrow-Line Region Viewed in X-rays

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.1606o&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #16.06; Bulletin of the American Astronomical Society, Vol. 32, p.695

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the X-ray spectrum and structure of the Seyfert 1.5 active galaxy NGC 4151, observed with the Chandra High Energy Transmission Grating. We see over 50 emission lines from high-ionization species, including N VII, hydrogen-like and helium-like O, Ne, Mg, Al, Si, S, and Ar, and Fe XVII-XX. We confirm that the low-energy (E<2.5 keV) emission is extended (Morse et al. 1995) and further find a correspondence on arcsecond scales to the optical narrow-line region. The hard continuuum source (E>2.5 keV) is point-like and was in an unusually low state during our observation. The dispersed spectrum is fit by highly absorbed non-thermal (power-law) emission from the central point source plus lines and continuum scattered by the extended photoionized nebula. Photoionization is clearly required by the large ratio of forbidden to resonance emission in O VII. Spatial broadening is seen in the X-ray emission lines, showing that they come from a region at least 2.5 arcsec in diameter. Differences in the the redshifts as well as ionization states of the X-ray and optical lines suggest that though the X-ray and optical line-emitting regions appear to be spatially coincident, they constitute two distinct components within the narrow-line region. This work was funded in part by contracts NAS8-38249 and SAO SV1-61010.

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