Velocities and rotational excitation of interstellar H2 toward Pi Scorpii

Details Velocities and rotational excitation of interstellar H2 toward Pi Scorpii Velocities and rotational excitation of interstellar H2 toward Pi Scorpii

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..785j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. 785-810.

Astronomy and Astrophysics

Astrophysics

39

Hydrogen, Interstellar Gas, Molecular Excitation, Rotational Spectra, Absorption Spectra, Line Spectra, Stellar Spectra, Ultraviolet Spectra

Scientific paper

A spectrum of Pi Sco showing numerous atomic lines and 70 absorption features from the Lyman and Werner transitions of interstellar H2 in rotational level J from zero to five is presented. Their shapes of the composite column density profiles are very nearly Gaussian with a one-dimensional rms velocity dispersion of 3 km/s. The behavior of shifts in the inferred N(H2) as a function of velocity are consistent with the overall profiles being composed of nearly symmetrical, tightly paced assemblies of about seven unresolved components. The relative overall column densities in the higher J levels of H2 are consistent with a model where these states are populated by optical pumping through the Lyman and Werner transitions, powered by UV radiation from nearby stars. The slight narrowing of the high-J profiles may be due to small clumps of H2 at radial velocities some 5-8 km/s from the core of the profile are exposed to a pumping flux about 10 times lower than that for the material near the profile's center.

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