Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..569k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 569-577.
Astronomy and Astrophysics
Astronomy
10
Brightness Distribution, Galactic Structure, Spiral Galaxies, Absorption Spectra, Astronomical Models, Galactic Bulge, Optical Thickness
Scientific paper
The V-band data obtained with the KISO Schmidt telescope are used to investigate the inclination effects due to the internal absorption on the surface brightness of spiral galaxies at the center mu0 and at the equivalent radius mu(e). The results confirm the general trend of the inclination effect from the ESO Schmidt data in the B band, in particular, the small inclination effect on mu(e) from middle-type spirals, upon which the current argument of the highly opaque nature of galaxy disks by Valentijin (1991) is based. Those empirical results are compared with predictions from simple models of disks and bulges obscured by an exponential absorbing layer with various optical thicknesses and relative scale height. The general trends of variation in mu(e) and mu0 over various types of spiral galaxies are interpreted in terms of increasing bulge/disk ratio, and of decreasing relative scale height with decreasing type index, without assuming highly opaque disks.
Doi Mamoru
Kodaira Keiichi
Shimasaku Kazuhiro
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