Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4507c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #45.07; Bulletin of the American Astronomical Society, Vol. 39, p.797
Other
Scientific paper
Mass outflows from AGN are often detected via blueshifted UV and X-ray absorption lines. Given the large global covering factors ( 0.5) and significant column densities of the outflows, one might expect that the ionized gas is detectable in emission. If the emission lines can be distinguished from those of the classic broad- and narrow-line regions, they can provide additional clues to the nature of the outflows. Our analysis of STIS spectra of the Seyfert 1 galaxy NGC 4151 in a low state reveals a kinematic component of emission that is likely reponsible for the high-column UV and X-ray absorption that we see at a distance of 0.1 pc from the nucleus. Combining the absorption and emission constraints, we find that models that invoke magnetocentrifugal acceleration (e.g., in an accretion disk wind) to explain the outflows are favored over those that rely on radiation driving or thermal expansion. Since the properties of the mass outflows in NGC 4151 may be unusual, it is important to identify the emission from outflows in other AGN.
Crenshaw Michael D.
Kraemer Steven B.
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