Extraplanar emission-line gas in edge-on galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Gases, H Alpha Line, Infrared Astronomy, Spectroscopy, Spiral Galaxies, Star Formation, Emission Spectra, Infrared Astronomy Satellite, Luminosity, Telescopes

Scientific paper

Seven edge-on galaxies were imaged H alpha in order to determine if extraplanar emission-line gas (as seen in NGC 891) is a common feature of spiral galaxies. Four of the seven are found to have one or two prominent filamentary extraplanar structures apiece, with typical filament H alpha luminosities of 1037-1038 ergs s-1 and scales of 1-2 kpc. Unlike NGC 891, none of the galaxies has an extensive emission-line halo, to within the sensitivity of the observations, approximately 24 mag per square arcsec in H-alpha (equivalent to an emission measure of 19 pc cm-6 -- more than 7 times fainter than the diffuse emission of NGC 891.

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