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On the nature of the near-UV extended light in Seyfert galaxies.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Oct2009, Vol. 399 Issue 2, p842-860. 19p. 3 Charts, 6 Graphs. - Publication Year :
- 2009
-
Abstract
- We study the nature of the extended near-UV emission in the inner kiloparsec of a sample of 15 Seyfert (Sy) galaxies which have both near-UV (F330W) and narrow-band [O iii] high-resolution Hubble images. For the majority of the objects, we find a very similar morphology in both bands. From the [O iii] images, we construct synthetic images of the nebular continuum plus the emission-line contribution expected through the F330W filter, which can be subtracted from the F330W images. We find that the emission of the ionized gas dominates the near-UV extended emission in half of the objects. A further broad-band photometric study, in the bands F330W ( U), F547M ( V) and F160W ( H), shows that the remaining emission is dominated by the underlying galactic bulge contribution. We also find a blue component whose nature is not clear in four out of 15 objects. This component may be attributed to scattered light from the active galactic nuclei, to a young stellar population in unresolved star clusters, or to early disrupted clusters. Star-forming regions and/or bright off nuclear star clusters are observed in 4/15 galaxies of the sample. [ABSTRACT FROM AUTHOR]
- Subjects :
- *STAR clusters
*GALAXIES
*IONIZED gases
*MATHEMATICAL continuum
*ASTRONOMY
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 399
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 44540298
- Full Text :
- https://doi.org/10.1111/j.1365-2966.2009.15317.x