On the nature of the near-UV extended light in Seyfert galaxies

Details On the nature of the near-UV extended light in Seyfert galaxies On the nature of the near-UV extended light in Seyfert galaxies

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.399..842m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 399, Issue 2, pp. 842-860.

Astronomy and Astrophysics

Astronomy

Galaxies: Nuclei, Galaxies: Seyfert, Ultraviolet: Galaxies

Scientific paper

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 [OIII] high-resolution Hubble images. For the majority of the objects, we find a very similar morphology in both bands. From the [OIII] 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.

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