D/H: Present Understanding and Future Perspectives, an Observer's Point of View

Details D/H: Present Understanding and Future Perspectives, an Observer's Point of View D/H: Present Understanding and Future Perspectives, an Observer's Point of View

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1135...77o&link_type=abstract

FUTURE DIRECTIONS IN ULTRAVIOLET SPECTROSCOPY: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic

Computer Science

Galaxy Clusters, Quasars, Interstellar Medium And Nebulae In External Galaxies

Scientific paper

Determining the abundance of deuterium in the Galaxy was one of the primary goals of the FUSE mission. FUSE-based D/H and D/O measurements have been published for about thirty new lines of sight, probing column densities and distances that had not been previously accessible. The measurements confirmed that the deuterium abundance is variable on relatively small spatial scales. This had been observed before by Copernicus and IMAPS, albeit for a small number of sightlines. Together with previous D/H measurements, the FUSE observations led to a model that explains the D/H variations in terms of variable depletion of deuterium onto dust grains. Although not perfect and probably not the complete final answer this model is a big step forward in trying to understand the abundance of deuterium in the Milky Way. Such a model would not have been possible without the backdrop of the many FUSE measurements.
In this paper we review all the Galactic measurements of D/H and discuss the causes of uncertainty in these measurements and how they can be affected by systematic errors. We consider the possible causes of the D/H variability and explore future scientific directions that will allow us to better understand the behavior of D/H in the Galaxy.

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