A measurement of the optical depth through a galaxy disk

Details A measurement of the optical depth through a galaxy disk A measurement of the optical depth through a galaxy disk

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.363..240j&link_type=abstract

Nature (ISSN 0028-0836), vol. 363, no. 6426, p. 240-242.

Astronomy and Astrophysics

Astronomy

22

Emission Spectra, Interstellar Extinction, Optical Thickness, Spiral Galaxies, Astronomical Spectroscopy, H Alpha Line, H Beta Line, H Ii Regions, Red Shift

Scientific paper

The present approach to the controversy concerning the degree of dust obscuration of the disks of spiral galaxies notes that White and Keel's (1992) broadband color measurements of an overlapping galaxy pair were unable to unambiguously separate the galaxies' respective contributions. Attention is accordingly given here to individual emission lines, which are completely separated when the redshift difference between two galaxies is sufficiently large. Significant optical depths are here noted along three lines-of-sight through the foreground galaxy by comparing H-alpha/H-beta ratios for the H II region in the background galaxy with those in isolated spiral galaxies, and then exploiting the wavelength dependence of extinction by dust.

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