Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114..575f&link_type=abstract
The Astronomical Journal, v. 114, p. 575.
Astronomy and Astrophysics
Astronomy
8
Galaxies: Seyfert, Ultraviolet: Galaxies, Stars: Formation, Galaxies: Stellar Content
Scientific paper
We present deep vacuum ultraviolet (λλ 1200-3300 Å) imagery of four Seyfert galaxies observed by the Ultraviolet Imaging Telescope (UIT): NGC 1068, NGC 2992, NGC 4151, and Mrk 335. These data have a spatial resolution of ˜3" and a limiting surface brightness of ˜24.5 mag arcsec-2 The host galaxies display a diverse range in ultraviolet morphology. NGC 1068 contains multiple components: the central AGN and a population of luminous starburst knots embedded within a bright oval disk. The starburst disk dominates the observed UV luminosity producing 81% of the far-UV (λ ˜1500 Å) flux, and 83% of the near-UV (λ ˜2500Å) flux. In contrast to NGC 1068, the unresolved bright nucleus dominates the UV light distribution in NGC 4151. The disk component produces 19% of the global far-UV flux and 18% of the near-UV flux. The active nucleus in Mrk 335 appears as a point source in both bandpasses; the host galaxy is not detected. NGC 2992, detected at near-UV wavelengths only, displays diffuse, patchy light at the position of the optically-defined disk, but no bright nuclear source. The UIT imagery highlights the contrast between the recently-formed massive star populations in NGC 4151 and NGC 1068. The radial UV surface brightness profile in NGC 4151 is qualitatively similar to the profile shapes observed in a few nearby spiral disks, while the radial profile found for NGC 1068 is distinctly atypical. The large fraction of observed luminosity produced by the disk component in NGC 1068 demonstrates that even at ultraviolet wavelengths, the fractional contribution of an active nucleus to the observed global flux can be small.
Bohlin Ralph Charles
Collins Nicholas
Fanelli Michael N.
Neff Susan G.
O'Connell Robert West
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