The X‐Ray Warm Absorber in NGC 3516

DSpace/Manakin Repository

The X‐Ray Warm Absorber in NGC 3516

Citable link to this page

 

 
Title: The X‐Ray Warm Absorber in NGC 3516
Author: Mathur, Smita; Wilkes, Belinda Jane; Aldcroft, Thomas L.

Note: Order does not necessarily reflect citation order of authors.

Citation: Mathur, Smita, Belinda J. Wilkes, and Thomas Aldcroft. 1997. “The X‐Ray Warm Absorber in NGC 3516.” The Astrophysical Journal 478 (1) (March 20): 182–189. doi:10.1086/303761.
Full Text & Related Files:
Abstract: The Seyfert 1 galaxy, NGC 3516 has been the subject of many absorption line studies at both ultraviolet and X-ray wavelengths. In the UV, strong, broad, variable associated metal line absorption with velocity width ~2000 km s-1 is thought to originate in gas with NH gsim 1019 cm-2 lying between 0.01 and 9 pc from the central active nucleus. The Ginga X-ray data are consistent with several possibilities: a warm absorber and a cold absorber combined either with partial covering or an unusually strong reflection spectrum. We present ROSAT observations of NGC 3516 which show a strong detection of a warm absorber dominated by a blend of O VII/O VIII edges at ~0.8 keV with NH ~ 7 × 1021 cm-2 and U:8-12. We argue that NGC 3516 contains an outflowing "XUV" absorber showing the presence of X-ray absorption edges which are consistent with the presence of broad absorption lines in the old IUE spectra and their disappearance in the new UV observations. Our dynamical model suggests that the O VII absorption edge will continue to weaken compared to the O VIII edge, an easily testable prediction with future missions like AXAF. Eventually the source would be transparent to the X-rays unless a new absorption system is produced.
Published Version: doi:10.1086/311520
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:30212172
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters