Institute of Astronomy

When the spectral lines in the Seyfert Galaxy NGC 5548 went on holiday

SpeakerTalk DateTalk Series
Gary Ferland (U Kentucky)28 June 2019Institute of Astronomy Galaxies Discussion Group

Abstract

The emission-line regions in Active Galactic Nuclei (AGN) have
developed the reputation as being complicated with slow progress since
the first models by Bahcall & Kozlovsky in 1969. Despite this, they
are necessary probes of the inner regions of AGN and a primary
indicator of the black hole mass. When the recent HST STORM campaign was poised to produce the largest and best set of observations of NGC 5548, the lines decided to go on holiday rather than participate in yet another study. I will talk about what happened, and now a disk
wind can produce it. This wind is a likely source of the non-disk
emission that has been noted by many studies.

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