Implications of high-velocity interstellar H I absorption features

Details Implications of high-velocity interstellar H I absorption features Implications of high-velocity interstellar H I absorption features

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229l..81c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 229, Apr. 15, 1979, p. L81-L85.

Astronomy and Astrophysics

Astrophysics

17

Absorption Spectra, Hydrogen Clouds, Interstellar Gas, Shock Wave Propagation, Adiabatic Conditions, Gas Density, Lyman Spectra, Propagation Velocity

Scientific paper

Contributions to the interstellar H I column density at high velocities from immediate postshock gas and from the cooling gas behind a shock are compared. The detection of high-velocity H I in L-epsilon and L-delta for Iota Ori is reported and interpreted as cooling gas behind a shock of 100 km/s velocity. The immediate postshock gas should be observable for shock velocities greater than 200 km/s and permits direct determination of the velocities of adiabatic shocks in the interstellar medium. It is pointed out that interstellar L-alpha and L-beta lines may not have purely Lorentzian profiles if high-velocity H I is a widespread phenomenon.

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