Tiny-Scale Molecular Structures in the Magellanic Clouds (Part 1)

Details Tiny-Scale Molecular Structures in the Magellanic Clouds (Part 1) Tiny-Scale Molecular Structures in the Magellanic Clouds (Part 1)

2004-04-02

arxiv.org/abs/astro-ph/0404063v1

Astron.Astrophys. 422 (2004) 483-504

Astronomy and Astrophysics

Astrophysics

34 pages, 10 tables, 12 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20035903

We report on the {\small FUSE} detections of the HD and CO molecules {\bf on the lines of sight towards three Large Magellanic stars}: Sk $-$67D05, Sk $-$68D135, and Sk $-$69D246. HD is also detected for the first time {\bf on the lines of sight towards two Small Magellanic Cloud stars}: AV 95 and Sk 159. While the HD and CO abundances are expected to be lower in the Large Magellanic Cloud where molecular fractions are a third of the Galactic value and where the photodissociation flux is up to thousands times larger, we report an average HD/H$_2$ ratio of 1.4$\pm$0.5 ppm and CO/H$_2$ ratio ranging from 0.8 to 2.7 ppm similar to the Galactic ones. We tentatively identify a deuterium reservoir (hereafter D--reservoir) towards the Small Magellanic Cloud, along the light path to AV 95. We derive a D/H ratio ranging from 1. 10$^{-6}$ to 1.1 10$^{-5}$.

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