Remarkable emission-line profiles in the Seyfert galaxy ESO 263-G13 (= F 427)

Details Remarkable emission-line profiles in the Seyfert galaxy ESO 263-G13 (= F 427) Remarkable emission-line profiles in the Seyfert galaxy ESO 263-G13 (= F 427)

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302l...7w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 302, March 1, 1986, p. L7-L10.

Astronomy and Astrophysics

Astrophysics

12

Astronomical Spectroscopy, Emission Spectra, Line Shape, Periodic Variations, Seyfert Galaxies, Spectral Energy Distribution, Data Reduction, Galactic Nuclei, Velocity Distribution

Scientific paper

It has recently been claimed that the profiles of the nuclear forbidden O III 4959, 5007 A emission lines in the type two Seyfert galaxy ESO 263-G13 = F427 are variable over intervals as short as 30 minutes. Long-slit spectroscopic observations at and around the nucleus of the galaxy are reported, and these lines are found to be spatially extended over at least 8 arcsec (N-S), with velocity profiles which vary rapidly with position. In particular, the forbidden O III 4959, 5007 A line profiles are double-peaked at the nucleus, but become single-peaked and narrower in spectra obtained with the slit displaced 1.25 arcsec or more to north or south of the nucleus. The profiles exhibit strongly enhanced red wing asymmetries on the north side and blue wing asymmetries on the south side of the nucleus. It is argued that the claimed time variablity is not real, but reflects small differences in slit centering and seeing from exposure to exposure.

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