A new FUSE survey of interstellar HD

Theodore P. Snow, Teresa L. Ross, Joshua D. Destree, Meredith M. Drosback, Adam G. Jensen, Brian L. Rachford, Paule Sonnentrucker, Roger Ferlet

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

We have used archival FUSE data to complete a survey of interstellar HD in 41 lines of sight with a wide range of extinctions. This follow-up to an earlier survey was made to further assess the utility of HD as a cosmological probe; to analyze the HD formation process; and to see what trends with other interstellar properties were present in the data. We employed the curve-of-growth method, supported by line profile fitting, to derive accurate column densities of HD. We find that the N(HD)/2N(H2) ratio is substantially lower than the atomic D/H ratio and conclude that the molecular ratio has no bearing on cosmology, because local processes are responsible for the formation of HD. Based on correlations with E(B -V), H2, CO, and iron depletion, we find that HD is formed in the densest portion of the clouds; the slope of the log N(HD)/log N(H2) correlation is greater than 1.0, caused by the destruction rate of HD declining more slowly than that of H 2; and, as a sidelight, that the depletions are density dependent.

Original languageEnglish (US)
Pages (from-to)1124-1136
Number of pages13
JournalAstrophysical Journal
Volume688
Issue number2
DOIs
StatePublished - Dec 1 2008
Externally publishedYes

Keywords

  • ISM: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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