SIMBAD references

2008ApJ...688.1124S - Astrophys. J., 688, 1124-1136 (2008/December-1)

A new FUSE survey of interstellar HD.

SNOW T.P., ROSS T.L., DESTREE J.D., DROSBACK M.M., JENSEN A.G., RACHFORD B.L., SONNENTRUCKER P. and FERLET R.

Abstract (from CDS):

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 logN(HD)/logN(H2) correlation is greater than 1.0, caused by the destruction rate of HD declining more slowly than that of H2; and, as a sidelight, that the depletions are density dependent.

Abstract Copyright:

Journal keyword(s): ISM: Abundances

Status at CDS:  

Simbad objects: 50

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2020.04.04-18:23:04

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