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What Is the Total Deuterium Abundance in the Local Galactic Disk?*

, , , , , , , , , , , , , , , , and

© 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
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Author e-mails

jlinsky@jila.colorado.edu

Author affiliations

1 JILA, University of Colorado; and The National Institute of Standards and Technology, Boulder, CO 80309-0440

2 Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544-1001

3 Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218

4 Princeton University Observatory, Princeton, NJ 08544

5 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218

6 Laboratoire d'Astrophysique de Marseille, 13376 Marseille, France

7 Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208-2900

8 Observatoire de Paris-Meudon, LESIA, 92195 Meudon, France

9 Department of Astronomy, University of Wisconsin, 475 North Charter Street, Madison, WI 53706-1582

10 University of Texas at Austin, McDonald Observatory, Austin, TX 78712; Harlan J. Smith Postdoctoral Fellow

11 Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0389

12 Laboratory for Observational Cosmology, NASA Goddard Space Flight Center, Code 665, Greenbelt, MD 20771

Dates

Received 2005 May 24
Accepted 2006 May 2

Citation

Jeffrey L. Linsky et al 2006 ApJ 647 1106

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DOI

https://doi.org/10.1086/505556

Keywords

Galaxy: abundances; ISM: abundances; ISM: structure; solar neighborhood; ultraviolet: ISM

Journal RSS feed

0004-637X/647/2/1106

Abstract

Analyses of spectra obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite, together with spectra from the Copernicus and interstellar medium absorption profile spectrograph (IMAPS) instruments, reveal an unexplained, very wide range in the observed deuterium/hydrogen (D/H) ratios for interstellar gas in the Galactic disk beyond the Local Bubble. We argue that spatial variations in the depletion of deuterium onto dust grains can explain these local variations in the observed gas-phase D/H ratios. We present a variable deuterium depletion model that naturally explains the constant measured values of D/H inside the Local Bubble, the wide range of gas-phase D/H ratios observed in the intermediate regime [log N(H img1.gif) = 19.2-20.7], and the low gas-phase D/H ratios observed at larger hydrogen column densities. We consider empirical tests of the deuterium depletion hypothesis: (1) correlations of gas-phase D/H ratios with depletions of the refractory metals iron and silicon, and (2) correlation with the H2 rotational temperature. Both of these tests are consistent with deuterium depletion from the gas phase in cold, not recently shocked regions of the ISM, and high gas-phase D/H ratios in gas that has been shocked or otherwise heated recently. We argue that the most representative value for the total (gas plus dust) D/H ratio within 1 kpc of the Sun is ≥23.1 ± 2.4(1 σ) parts per million (ppm). This ratio constrains Galactic chemical evolution models to have a very small deuterium astration factor, the ratio of primordial to total (D/H) ratio in the local region of the Galactic disk, which we estimate to be fd ≤ 1.19img2.gif(1 σ) or ≤1.12 ± 0.14(1 σ) depending on the adopted light-element nuclear reaction rates.

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Footnotes

  • * 

    Based on observations made with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer. FUSE is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985.

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