Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47...17o&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 47, no. 1, p. 17--26
Astronomy and Astrophysics
Astronomy
15
Cosmic Dust, Galactic Structure, Infrared Absorption, Infrared Astronomy, Interstellar Extinction, Optical Thickness, Spiral Galaxies, Astronomical Photometry, Near Infrared Radiation, Stellar Structure, Stellar Systems
Scientific paper
J-band images obtained with a PtSi camera are analyzed together with available V-band images to yield model parameters for absorption layers, as well as for stellar components, in early-type edge-on galaxies: NGC 4217, NGC 4565, and NGC 4594. The stellar parameters derived with absorption effects are in reasonable agreement with those in previous publications, except for a possible shortening of the scale lengths in some cases. The absorbing matter in the disk distributes in a ring-like structure; its effective optical thickness at face-on is tauV less than 1 in the present models. The ratio tauV/tauJ is found to be approximately 4. The radial scale length and the geometrical thickness of the absorbing layer are estimated to be 0.5-2 and about 0.2-0.8 relative to those of the stellar disk, respectively. We cannot, however, exclude the special cases in which absorbing matter is also distributed in the inner part of the ring-like structure, but in such a manner that no significant asymmetric extinction is produced in the V and J bands.
Kodaira Keiichi
Ohta Kouji
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