Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..160p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 160-164
Astronomy and Astrophysics
Astronomy
35
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.
Bregman Joel N.
Pildis Rachel A.
Schombert James M.
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