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Far-Infrared detection of H2D+ toward Sgr B2

AutorCernicharo, José ; Polehampton, Edward T.; Goicoechea, Javier R.
Palabras claveAstrochemistry
Molecular processes
Line : identification
ISM : molecules
ISM : individual (Sgr B2)
Infrared : ISM
Fecha de publicación19-ene-2007
EditorAmerican Astronomical Society
University of Chicago Press
University of Chicago Press
The Astrophysical Journal Letters, 657:L21–L24, 2007 March 1
ResumenWe report on the first far-IR detection of H2D+, using the Infrared Space Observatory, in the line of sight toward Sgr B2 in the galactic center. The transition at λ=126.853 μm connecting the ground level of o-H2D+, 1_1,1 with the the 2_1,2 level at 113 K, is observed in absorption against the continuum emission of the cold dust of the source. The line is broad, with a total absorption covering 350 km s^-1, i.e., similar to that observed in the fundamental transitions of H2O, OH and CH at ~179, 119 and 149 μm respectively. For the physical conditions of the different absorbing clouds the H2D+ column density ranges from 2 to 5x10^13 cm^-2, i.e., near an order of magnitude below the upper limits obtained from ground based submillimeter telescopes. The derived H2D+ abundance is of a few 10^-10, which agrees with chemical models predictions for a gas at a kinetic temperature of ~20K.
DescripciónAccepted in Astrophysics Journal Letters. Non edited.
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