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The Problem of the UV Interstellar Absorption Band at 2200A

Published online by Cambridge University Press:  25 September 2017

D.J. Carnochan ,
K. Nandy ,
A.J. Willis  and
R. Wilson
D.J. Carnochan
Affiliation:
Dept. of Physics and Astronomy, University College, London Gbwer Street, London, WC1
K. Nandy
Affiliation:
Dept. of Physics and Astronomy, University College, London Gbwer Street, London, WC1
A.J. Willis
Affiliation:
Dept. of Physics and Astronomy, University College, London Gbwer Street, London, WC1
R. Wilson
Affiliation:
Dept. of Physics and Astronomy, University College, London Gbwer Street, London, WC1

Extract

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The ultraviolet interstellar extinction curve from 2740Å to 1350Å has been obtained using data from the S2/68 satellite experiment. The extinction increases into the ultraviolet and shows a pronounced peak at 2200Å. This is interpreted as a general scattering continuum with a strong absorption feature superposed on it at 2200Å. The profile of the feature appears to be symmetrical and has a half-width of 360Å. There is a strong correlation between the strength of the feature and the scattering part of the curve in both the ultraviolet and the visible. On a broad scale the shape of the extinction curve is constant showing no variation with distance from the sun, direction around the galaxy, and height above the galactic plane.