Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259..293f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 2, p. 293-301.
Astronomy and Astrophysics
Astronomy
27
Active Galactic Nuclei, Starburst Galaxies, Supernova Remnants, H Ii Regions, Interstellar Matter, Star Formation, Supergiant Stars
Scientific paper
We present optical and near-infrared images, together with long-slit spectra at red wavelengths, of NGC 1808. The complex morphology of hotspots seen at short wavelengths may be the result of dust obscuration. Our data (namely the equivalent width of the Ca II triplet and broad-band colors) suggest the presence of red super-giants, associated with a burst of star formation less than 5 x 10 exp 7 yr ago. NGC 1808 is claimed to show spectral evidence for weak Seyfert-like activity in the nucleus, surrounded by a circumnuclear starburst. Combining our data with those in the literature, we discuss the nature of the hotspots and nucleus. In particular, we show that the line ratios and widths in the nucleus are qualitatively consistent with those of a supernova remnant embedded within a high-abundance H II region. The (S II) doublet indicates a large electron density. We conclude that the radio properties of the nucleus and nuclear region can be explained by a few, albeit powerful, SNRs.
Boisson Catherine
Forbes Duncan A.
Ward Martin J.
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