Direct measurement of the optical depth in a spiral galaxy

Details Direct measurement of the optical depth in a spiral galaxy Direct measurement of the optical depth in a spiral galaxy

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.359..129w&link_type=abstract

Nature (ISSN 0028-0836), vol. 359, no. 6391, Sept. 10, 1992, p. 129-131. Research supported by NSF.

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61

Astronomical Photometry, Optical Thickness, Spiral Galaxies, Interstellar Extinction, Opacity

Scientific paper

An attempt is made to directly measure optical extinction in a number of spiral disks, using pairs in which a foreground spiral is backlit by another galaxy. An example is presented where substantial extinction of starlight occurs, but the extinction is mostly associated with the spiral features in which much of the light arises in the first place. It is suggested that this correlation of extinction with emission may account for both the transparency and apparent opacity of spiral galaxies.

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