HD in the Galactic ISM

Details HD in the Galactic ISM HD in the Galactic ISM

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..100l&link_type=abstract

Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present column density measurements of the HD molecule in the interstellar gas toward 17 heavily reddened Galactic sightlines. Seven are derived from observations with FUSE, and ten are reanalysis of spectra obtained with Copernicus. Comparisons of the column densities HD, CH, CN, and K I in these 17 sightlines indicate that HD is most tightly correlated with CH. Stringent lower limits to the interstellar D/H ratio, derived from the HD/2H2 ratio, range from 3.7 × 10-7 to 4.3 × 10-6. Our results also suggest that the HD/H2 ratio increases with the molecular fraction f(H2).

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