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 journalArticle

18 Citations (Scopus)

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

Fingerprint

Far UV Spectroscopic Explorer
depletion
cosmology
line of sight
destruction
extinction
probe
slopes
trends
iron
probes
curves
profiles
rate
method
trend

Keywords

  • ISM: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Snow, T. P., Ross, T. L., Destree, J. D., Drosback, M. M., Jensen, A. G., Rachford, B. L., ... Ferlet, R. (2008). A new FUSE survey of interstellar HD. Astrophysical Journal, 688(2), 1124-1136. https://doi.org/10.1086/592288

A new FUSE survey of interstellar HD. / Snow, Theodore P.; Ross, Teresa L.; Destree, Joshua D.; Drosback, Meredith M.; Jensen, Adam G; Rachford, Brian L.; Sonnentrucker, Paule; Ferlet, Roger.

In: Astrophysical Journal, Vol. 688, No. 2, 01.12.2008, p. 1124-1136.

Research output: Contribution to journalArticle

Snow, TP, Ross, TL, Destree, JD, Drosback, MM, Jensen, AG, Rachford, BL, Sonnentrucker, P & Ferlet, R 2008, 'A new FUSE survey of interstellar HD', Astrophysical Journal, vol. 688, no. 2, pp. 1124-1136. https://doi.org/10.1086/592288
Snow TP, Ross TL, Destree JD, Drosback MM, Jensen AG, Rachford BL et al. A new FUSE survey of interstellar HD. Astrophysical Journal. 2008 Dec 1;688(2):1124-1136. https://doi.org/10.1086/592288
Snow, Theodore P. ; Ross, Teresa L. ; Destree, Joshua D. ; Drosback, Meredith M. ; Jensen, Adam G ; Rachford, Brian L. ; Sonnentrucker, Paule ; Ferlet, Roger. / A new FUSE survey of interstellar HD. In: Astrophysical Journal. 2008 ; Vol. 688, No. 2. pp. 1124-1136.
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