Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-25
Astrophys.J. 556 (2002) 905
Astronomy and Astrophysics
Astrophysics
15 pages, 2 figures, accepted for publication in ApJ
Scientific paper
10.1086/338136
The 2.46um v=1-0 R(5) line of deuterated molecular hydrogen, HD, has been detected in the Orion Peak~1 shock emission region, at a surface brightness of (8.5 +/- 2.1) x 10^(-9) W m^(-2)sr^(-1) over a 6 arcsec^2 area. Comparison of the column density of HD(v=1,J=6) with the column density of HD(v=0,J=6) previously observed from ISO and the H_2 level column densities toward the same region implies that the excitation of HD is similar to that of H_2 for these energy levels, despite much higher spontaneous transition rates for HD. We suggest that this rough equality is caused by the coupling of the HD levels to those of H_2, due to strong reactive collisions, HD + H -> H_2 + D, in warm, partially dissociated gas. The deuterium abundance implied by the combined ISO and UKIRT measurements toward Orion Peak 1 is [D]/[H] = (5.1 +/- 1.9)x10^(-6).
Bertoldi Frank
Geballe Thomas Ronald
Mountain Charles M.
Ramsay Howat Suzanne K.
Timmermann Ralf
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