[Previous] | [Session 11] | [Next]
P. M. Ogle, R. R. J. Antonucci (UCSB), H. L. Marshall (MIT CXC)
NGC 4151 (z=0.00332) is a bright, nearby Seyfert 1.5 active galaxy. It has an extended, photoionized optical and X-ray narrow-line region. We previously explained the strong resonance lines in the Chandra HETGS spectrum by invoking a hot, collisionally ionized intercloud medium (Ogle et al. 2000). We show in this poster that photoexcitation (resonance scattering) is a more consistent explanation.
We have also made new LETGS observations which extend this result to longer wavelengths. We show a detailed photoionization model fit of all H-like and He-like K-shell and Fe L-shell emission lines and recombination continua. We also explore the strong continuum spectral variability to see if it can be explained by a variable absorber.
This research is based on data taken with the Chandra X-ray Observatory and funded by Smithsonian grant G02-3146X.
If you would like more information about this abstract, please follow the link to http://xmmoms.physics.ucsb.edu. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.
The author(s) of this abstract have provided an email address for comments about the abstract: pmo@xmmom.physics.ucsb.edu
[Previous] | [Session 11] | [Next]
Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.