Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.304..241f&link_type=abstract
Nature (ISSN 0028-0836), vol. 304, July 21, 1983, p. 241-243.
Astronomy and Astrophysics
Astronomy
15
Forbidden Transitions, Line Spectra, Seyfert Galaxies, Spiral Galaxies, Balmer Series, Emission Spectra, Oxygen
Scientific paper
F-427 = ESO263-G13 is seen as a nearly flat-on spiral galaxy about 55 arc s in diameter on the SERC IIIa-J sky survey. It has a bright and distinct nucleus and has been selected for a survey of compact and bright-nucleus galaxies. Spectroscopic observations at the South African Astronomical Observatory, Sutherland of this extreme Seyfert 2 galaxy (RA 10h07m44s, dec -42°33arcmin30arcsec) reveal apparent profile variations in the [O III] 5,007+4,959 emission lines over as short an interval as 30 min - in complete contradiction to theoretical considerations. Attempts to explain the variations as being statistical, instrumental or spatial in origin are unsuccessful.
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