Mass Outflow in the Seyfert 1 Galaxy NGC 5548

Details Mass Outflow in the Seyfert 1 Galaxy NGC 5548 Mass Outflow in the Seyfert 1 Galaxy NGC 5548

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342014c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #420.14; Bulletin of the American Astronomical Society, Vol. 41, p.238

Astronomy and Astrophysics

Astronomy

Scientific paper

We present HST/STIS echelle observations of the Seyfert 1 galaxy NGC 5548 obtained in 2004, when the AGN was in an historically low state. We have identified emission lines in the spectra that have widths of 700 km/sec (FWHM), intermediate between those of the broad and narrow emission line regions. Photoionization models indicate that the ionic column densities from this intermediate-line region (ILR) are much greater than the observed columns from the outflowing UV absorbers. This suggests that we are viewing the AGN at a smaller polar angle than that in NGC 4151, where we see the ILR directly in absorption. We present a simple geometic model of the mass outflow in these two sources.

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