Extraplanar ionized gas and kinematics in the edge-on galaxy NGC 891

Details Extraplanar ionized gas and kinematics in the edge-on galaxy NGC 891 Extraplanar ionized gas and kinematics in the edge-on galaxy NGC 891

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...374..507k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 374, June 20, 1991, p. 507-515. Research supported by Max-Planck-Institut f

Astronomy and Astrophysics

Astrophysics

50

H Alpha Line, Ionized Gases, Spiral Galaxies, Astronomical Spectroscopy, Galactic Structure, Interstellar Matter, Spectrograms

Scientific paper

Spectroscopic observations of the edge-on spiral galaxy NGC 891 confirm the existence of ionized gas well above its central plane. H-alpha can be traced to z above 30 arcsec corresponding to z above 1.4 kpc. Alternative situations (an incorrect aspect ratio, a warp in the plane, or scattering from extraplanar dust) are considered and rejected. Eleven spectrograms positioned parallel and perpendicular to the plane show that this gas is in cylindrical rotation to at least z = 0.7 kpc, to within the accuracy of measurement, 25 km/s. Corotation is most readily understood if this high-z gas originates within the disk. The structure and physical state of this extraplanar ionized gas are discussed.

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