Extraplanar emission-line gas in NGC 891

Details Extraplanar emission-line gas in NGC 891 Extraplanar emission-line gas in NGC 891

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423..190p&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 423, no. 1, p. 190-195

Astronomy and Astrophysics

Astrophysics

21

Astronomical Models, Corotation, Emission Spectra, H Alpha Line, Spiral Galaxies, Bubbles, Gas Ionization, Halos, Interstellar Matter, Kinematics, Prominences

Scientific paper

We have used spectroscopy and high-resolution imaging to study the disk-halo interaction in the edge-on spiral galaxy NGC 891, which is known to have extraplanar gas. H(alpha) imaging of the northeast side of this galaxy reveals diffuse emission-line gas both above and below the plane, as well as new bubble-like structures on 0.5-1 kpc scales emerging from the disk. The diffuse emission is best modeled in the radial direction as a disk of constant emission measure with a sharp cutoff. Long-slit spectroscopy of the H(alpha) line within 2.4 kpc of the galaxy's plane shows departures from the velocity structure found in a model with strict corotation. The departures from corotation range up to 40 km/s, consistent with galactic fountain theory.

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