The Density of Molecules in Interstellar Space

Details The Density of Molecules in Interstellar Space The Density of Molecules in Interstellar Space

Aug 1915

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1915natur..95..701k&link_type=abstract

Nature, Volume 95, Issue 2391, pp. 701-703 (1915).

Physics

Scientific paper

IN recent years evidence has been brought forward by several investigators1 indicating that light from distant stars suffers a slight attenuation in travelling through interstellar space. In particular a recent investigation by Jones2 assigns fairly definite numerical values to coefficients of attenuation corresponding to ``photographic'' and ``visual'' light from stars of known proper motions and spectral types the magnitudes of which had been carefully measured by Parkhurst3 for light of these wave-lengths. If, as seems reasonable, this extinction is assumed to be due to attenuation by scattering in travelling through a ``residual'' gas occupying, interstellar space, we are enabled to estimate the average density of molecules in the intervening regions, following a method due originally to Larmor4 for assigning an upper limit to the density of matter in comets' tails.

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