Absorption line studies and the distribution of neutral gas in the local interstellar medium

Details Absorption line studies and the distribution of neutral gas in the local interstellar medium Absorption line studies and the distribution of neutral gas in the local interstellar medium

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345...39b&link_type=abstract

In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 39-50 (SEE N85-15539 06-90)

Astronomy and Astrophysics

Astronomy

23

Absorption Spectra, Hydrogen, Interstellar Matter, Iue, Neutral Gases, Oao 3, Sun, Backscattering, Line Spectra, Morphology, Stellar Winds, Ultraviolet Spectra, Visible Spectrum, White Dwarf Stars

Scientific paper

Previous published absorption line studies performed at ultraviolet and visual wavelengths are combined with new ultraviolet data in order to map out the distribution of HI within 150 pc of the Sun. Newly presented data for distances less than 50 pc further support the local cloud model as presented by Bruhweiler (1982). The Sun is embedded, near the edge of a diffuse cloud with total column density 2 x 10 to the 19th power/sq cm. Most observed directions within 50 pc away from the cloud body reveal trace amounts of gas (N)HI) approximately 10 to the 18th power/sq cm presumably arising in the outer skin of the local cloud. At greater distances (50 approximately or d approximately or 150 pc) most directions show significant absorption with N(HI) 10(19)/sq cm. Two directions, one toward the northern galactic pole (NGP), the other toward beta CMa exhibit unusually low HI column densities out to distances of 150 to 200 pc. However, substantial amounts of gas N(HI) 10 to the 19th power/sq cm, are seen toward the NGP at greater distances. The implicatons of these results on astronomy at wavelengths shortward of 912A are discussed.

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