SIMBAD references

2007ApJ...657L..21C - Astrophys. J., 657, L21-L24 (2007/March-1)

Far-infrared detection of H2D+ toward Sgr B2.

CERNICHARO J., POLEHAMPTON E. and GOICOECHEA J.R.

Abstract (from CDS):

We 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+, 11,1, with the 21,2level 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, 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 5x1013/cm2, 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 times 10–10, which agrees with chemical model predictions for a gas at a kinetic temperature of ≃20 K.

Abstract Copyright:

Journal keyword(s): Astrochemistry - Infrared: ISM - ISM: Individual: Name: Sagittarius B2 - ISM: Molecules - Line: Identification - Molecular Processes

Simbad objects: 9

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