Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.1706k&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #17.06; Bulletin of the American Astronomical Society, Vol. 33, p.812
Astronomy and Astrophysics
Astronomy
1
Scientific paper
A new, unprecedented era in X-ray spectroscopy has been made possible by the recent launching of the XMM-Newton and Chandra satellites. X-ray spectra, roughly comparable in resolution to optical/UV spectra, have been taken for several Seyfert 2 galaxies, including the brightest one, NGC 1068. Despite the varying optical, UV, and IR spectra of these Seyfert 2, their X-ray spectra appear remarkably similar. Bright, narrow radiative recombination continua provide the ``smoking gun'' for relatively cool, recombining gas photoionized by the nuclear continuum. However, all spectra show deviations from the predicted spectrum of a purely recombining gas. These deviations could be due to significant photoexcitation or a separate, collisionally-driven gas component (e. g., shock-heated gas in starburst regions). The observed anomalous strength of the higher-order ionic transitions provides unambiguous evidence for photoexcitation, whereas iron L-shell transitions provide useful diagnostics for determining the amount of collisionally-driven gas. Given the ability for robust discrimination of emission mechanisms, X-ray spectroscopy is uniquely well suited for probing the possible connection between Active Galactic Nucleus activity and star formation. A. K. would like to acknowledge support from an NSF fellowship.
Behar Ehud
Brinkman Albert C.
Kaastra Jelle S.
Kahn Steve M.
Kinkhabwala Ali
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