Molecular gas distribution and dynamics of the edge-on spiral galaxy NGC 891 - Discovery of a molecular halo

Details Molecular gas distribution and dynamics of the edge-on spiral galaxy NGC 891 - Discovery of a molecular halo Molecular gas distribution and dynamics of the edge-on spiral galaxy NGC 891 - Discovery of a molecular halo

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...266...21g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 266, no. 1, p. 21-36.

Astronomy and Astrophysics

Astrophysics

80

Galactic Halos, Galactic Structure, Interstellar Gas, Molecular Gases, Spiral Galaxies, Astronomical Spectroscopy, Carbon Monoxide, Molecular Clouds, Spatial Distribution, Spectral Line Width

Scientific paper

The IRAM 30-m telescope was used to measure the edge-on spiral galaxy NGC 891 in the J = 2-1 and 1-0 lines of (C-12)O. Molecular gas was detected from +4.5 to -4.5 arcmin along the major axis, and up to 24-30 arcsec above and below the plane of the galaxy. The overall molecular gas distribution is described in terms of a thin disk with a central hole of radius 2-3 kpc and a fast-rotating nuclear disk. A 'halo' of molecular gas not less than 7 kpc in radius and 2-3 kpc thick was detected. The halo, which is very weak in the 1-0 line, seems relatively hot and not very optically thick. The thin disk contains extended, nonaxisymmetric structures, which are probably spiral arms. Its (C-12)O emission and (C-13)O emission are analyzed with an LVG radiative transfer code. The observed line intensities imply the presence of dense cores and diffuse envelopes, with about half of the molecular mass in the diffusive envelopes.

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