Statistics – Applications
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..155k&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 2, p. 155-164
Statistics
Applications
8
Astronomical Models, Emissivity, Galactic Structure, Galaxies, Interstellar Extinction, Light (Visible Radiation), Near Infrared Radiation, Optical Thickness, Independent Variables, Photometry
Scientific paper
We explore the possibility of estimating the optical thickness of an absorbing disk in edge-on galaxies by making use of the asymmetry of the extinction profile along the minor axis. We generate minor axis profiles for edge-on model galaxies which comprise a quasi-Hubble-type spheroid and an exponential-type disk, as well as an absorbing layer residing with the disk in order to derive the difference in the extinction profile between the two sides of the center along the minor axis for various sets of model parameters. This differential extinction profile is found to be sensitive to the parameters of the absorbing disk and to the bulge/disk ratio of galaxies, but to be rather insensitive to details concerning the functional forms of stellar distribution models in galaxies. The dependence of the shape characteristics of the differential extinction profiles on various model parameters are investigated within the scope of future applications of the model profiles for comparisons with observations in the optical and near-infrared region. The differential extinction profiles are found to be useful in estimating the optical thickness at the disk center, tau0, when model parameters for the stellar distribution have been estimated in advance. The effect of tau0, however, is coupled with that of the other parameter of the absorbing disk, namely, the ratio of the vertical to the radial scale length, alpha defined as (z0,A)/(R0,A), in controlling the main characteristics of the differential extinction profiles. Estimates of tau0 might be largely in error when simple models with arbitrarily fixed value of alpha are used in comparison with the observations. We propose a procedure of model fitting to observations in order to seek approximate solutions of tau0 and alpha, though no rigorous convergence nor uniqueness is guaranteed.
Kodaira Keiichi
Ohta Kouji
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