Molecular Hydrogen along Two Lines of Sight through the Large Magellanic Cloud

Details Molecular Hydrogen along Two Lines of Sight through the Large Magellanic Cloud Molecular Hydrogen along Two Lines of Sight through the Large Magellanic Cloud

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110...60g&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 743, pp. 60-67.

Astronomy and Astrophysics

Astronomy

9

Ism: Atoms, Extinction

Scientific paper

We have remeasured the H_2 column densities along lines of sight to the Large Magellanic Cloud (LMC) using spectra taken by the Hopkins Ultraviolet Telescope (HUT). Three lines of sight were analyzed using the pair method and previously determined Fitzpatrick & Massa extinction parameters to allow H_2 absorption models to be fitted. Substantial improvements over the values first reported by Clayton et al. were made for two of the three lines of sight. Comparisons between LMC and Galactic environments suggest that the factors which lead to extinction curve variations (e.g., metallicity or shocks) do not affect the efficiency of H_2 formation on the surfaces of the dust grains: N_H_2/E(B-V) values are approximately the same in both galaxies despite large differences in N_H_I/E(B-V).

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