The giant outflow cone in NGC 253

Details The giant outflow cone in NGC 253 The giant outflow cone in NGC 253

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266..167s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 167-176.

Astronomy and Astrophysics

Astrophysics

38

Galactic Nuclei, Molecular Flow, Starburst Galaxies, Astronomical Spectroscopy, Emission Spectra, Interstellar Matter, Shock Waves

Scientific paper

East-west orientated long-slit spectra taken along the nucleus of the starburst galaxy NGC 253 and at 8, 12, and 16 arcsec to the south are presented. The three off-nuclear spectra are consistent with the typical lens-shaped spatio-kinematic pattern of an expanding shell. In light of previous evidence for outflow in NGC 253 we consider our data as signifying emission from the surface of a kiloparsec-sized outflow cone driven by the starburst wind. The emission-line intensity ratio forbidden N II 6583/H-alpha is about twice as high in the nucleus as in disk forbidden H II regions while forbidden S II 6716, 6731/H-alpha does not vary. This is consistent with a nitrogen overabundance in the center of the galaxy. A similar overabundance is indicated for the outflow cone.

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