Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99...53r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 53-60.
Astronomy and Astrophysics
Astronomy
12
Extragalactic Radio Sources, Galactic Nuclei, H Ii Regions, Radio Spectra, Seyfert Galaxies, Stellar Spectra, Emission Spectra, Infrared Astronomy Satellite, Line Spectra, Morphology
Scientific paper
Spectroscopic and morphological observations of the nuclear region of the Seyfert 2 galaxy NGC 5953 = Arp 91 B are presented. It is shown that an extended emitting region, with features typical of a supergiant H II region, is located to the west of the nucleus within a radio structure which is emitting as a nonthermal source with spectral index alpha = 0.6 in the 1.4-5.0 GHz range. The nonthermal radio emission is tentatively interpreted as the result of frequent supernova blasts and the consistency of this interpretation with the optical data is discussed. Another extended emitting region, located close to the nucleus to its east, in a position symmetrically opposite to the western region, is revealed by the present spectra.
Osterbrock Donald E.
Pogge Richard W.
Rafanelli Piero
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