Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.4610c&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #46.10; Bulletin of the American Astronomical Society, Vol. 25, p.1363
Astronomy and Astrophysics
Astronomy
Scientific paper
We present ultraviolet images of four Seyfert galaxies observed with the Ultraviolet Imaging Telescope (UIT) and compare their off-nuclear UV morphology and colors. Images were obtained at far-UV (FUV), lambda_ {eff} ~ 1520 Angstroms, and near-UV (NUV), lambda_ {eff} ~ 2490 Angstroms, wavelengths for NGC 1068 (Sy 2), NGC 2992 (Sy 2), NGC 4151 (Sy 1), and MRK 335 (Sy 1). UV imagery permits detection of recent high-mass star formation in AGN host galaxies since the cool stars which dominate the light at optical wavelengths contribute minimal light in the vacumn UV. The host galaxies span a broad range in UV morphology. NGC 1068 contains multiple components at UV wavelengths: the central AGN; a population of luminous starburst knots; a bright oval inner disk; and a fainter, more circular outer disk. The brightest knot gives NGC 1068 a `double nucleus' appearance in the UV and is ~ 80 times the luminosity of 30 Doradus. The UV flux is dominated by the disk + knot component, the AGN produces 17% of the total flux in the NUV and 29% in the FUV. In contrast to NGC 1068, the unresolved bright nucleus dominates the UV light distribution in NGC 4151. Two lobes of emission are observed bracketing the nucleus extending to ~ 6 kpc (Hennessy et al. 1992, BAAS 24, 1274). The AGN comprises 76% of the total flux in the NUV and 81% in the FUV. The active nucleus in MRK 335, the most distant object in our sample (D ~ 105 Mpc), appears as a point source in both bandpasses with a FWHM of ~ 3.4('') , which corresponds to a linear distance of 1.7 kpc. After subtraction of the AGN light distribution, no additional UV emission is observed. NGC 2992 is detected at NUV wavelengths only. The data reveal diffuse (perhaps dust-scattered) light at the position of the optically-defined bulge, but no bright nuclear source. We use these data to estimate the massive star formation rate in the AGN host galaxies.
Bohlin Ralph
Collins Nicholas R.
Fanelli Michael N.
Hennessy Greg S.
Neff Susan G.
No associations
LandOfFree
Massive Star Formation in AGN Host Galaxies Observed by the Ultraviolet Imaging Telescope does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Massive Star Formation in AGN Host Galaxies Observed by the Ultraviolet Imaging Telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Massive Star Formation in AGN Host Galaxies Observed by the Ultraviolet Imaging Telescope will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-778859