Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43..755a&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 6, 1991, p. 755-780.
Astronomy and Astrophysics
Astronomy
28
Cosmic Dust, Galactic Nuclei, Infrared Imagery, Spectral Bands, Spiral Galaxies, Star Formation, Carbon Monoxide, Data Reduction, Interstellar Extinction, Interstellar Gas, Near Infrared Radiation
Scientific paper
Near-IR images of NGC 891, an edge-on spiral galaxy, are presented and interpreted in terms of galactic composition and morphology with reference to existing data. The near-IR camera has a large field of view (4.2 x 4.2 arcmin) to allow observations of this galaxy which resembles the Milky Way and has a large apparent size. Near-IR surface photometry is used to derive the color distributions, the gas-to-dust ratio, and structure parameters, all of which are compared to those of the Milky Way. The dust lane is visible at J, H, and K, and NGC 891 is characterized as not being exactly edge-on. The gas-to-extinction ratio of the disk is similar to that of the solar vicinity, although the total ratio is twice the value of that of the Milky Way. About 20 percent of the dust in NGC 891 is warm enough to emit far-IR light, and it appears that M-supergiants are the most common objects in the galaxy.
Aoki Tetsuo E.
Hiromoto Norihisa
Okamura Sadanori
Takami Hideki
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