| dc.creator |
Cernicharo, José |
|
| dc.creator |
Polehampton, Edward T. |
|
| dc.creator |
Goicoechea, Javier R. |
|
| dc.date |
2007-12-27T16:45:47Z |
|
| dc.date |
2007-12-27T16:45:47Z |
|
| dc.date |
2007-01-19 |
|
| dc.date.accessioned |
2017-01-31T00:59:33Z |
|
| dc.date.available |
2017-01-31T00:59:33Z |
|
| dc.identifier |
arXiv:astro-ph/0701559v1 |
|
| dc.identifier |
The Astrophysical Journal Letters, 657:L21–L24, 2007 March 1 |
|
| dc.identifier |
1538-4357 |
|
| dc.identifier |
http://hdl.handle.net/10261/2623 |
|
| dc.identifier |
10.1086/512857 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/2623 |
|
| dc.description |
Accepted in Astrophysics Journal Letters. Non edited. |
|
| dc.description |
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+, 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. |
|
| dc.description |
We thank the Spanish MEC for funding support
through grant ESP2004-665, AYA2003-2785, and "Comunidad de Madrid" Government under PRICIT project S-0505/ESP-0237 (ASTROCAM). This study is supported in part by the European Community’s human potential Programme under contract MCRTN-CT-2004-51230, Molecular Universe. JRG was supported by an individual Marie Curie fellowship under contract MEIFCT-2005-5153340. |
|
| dc.description |
Peer reviewed |
|
| dc.format |
534998 bytes |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.publisher |
American Astronomical Society |
|
| dc.publisher |
University of Chicago Press |
|
| dc.publisher |
University of Chicago Press |
|
| dc.relation |
Preprint |
|
| dc.rights |
openAccess |
|
| dc.subject |
Astrochemistry |
|
| dc.subject |
Molecular processes |
|
| dc.subject |
Line : identification |
|
| dc.subject |
ISM : molecules |
|
| dc.subject |
ISM : individual (Sgr B2) |
|
| dc.subject |
Infrared : ISM |
|
| dc.title |
Far-Infrared detection of H2D+ toward Sgr B2 |
|
| dc.type |
Pre-print |
|