|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Depletion of chlorine into HCl ice in a protostellar core | | M. Kama
; E. Caux
; A. Lopez-Sepulcre
; V. Wakelam
; C. Dominik
; C. Ceccarelli
; M. Lanza
; F. Lique
; B.B. Ochsendorf
; D.C. Lis
; R.N. Caballero
; A.G.G.M. Tielens
; | | Date: |
24 Nov 2014 | | Abstract: | The freezeout of gas-phase species onto cold dust grains can drastically
alter the chemistry and the heating-cooling balance of protostellar material.
In contrast to well-known species such as carbon monoxide (CO), the freezeout
of various carriers of elements with abundances $<10^{-5}$ has not yet been
well studied. Our aim here is to study the depletion of chlorine in the
protostellar core, OMC-2 FIR 4. We observed transitions of HCl and H2Cl+
towards OMC-2 FIR 4 using the Herschel Space Observatory and Caltech
Submillimeter Observatory facilities. Our analysis makes use of state of the
art chlorine gas-grain chemical models and newly calculated HCl-H$_{2}$
hyperfine collisional excitation rate coefficients. A narrow emission component
in the HCl lines traces the extended envelope, and a broad one traces a more
compact central region. The gas-phase HCl abundance in FIR 4 is 9e-11, a factor
of only 0.001 that of volatile elemental chlorine. The H2Cl+ lines are detected
in absorption and trace a tenuous foreground cloud, where we find no depletion
of volatile chlorine. Gas-phase HCl is the tip of the chlorine iceberg in
protostellar cores. Using a gas-grain chemical model, we show that the
hydrogenation of atomic chlorine on grain surfaces in the dark cloud stage
sequesters at least 90% of the volatile chlorine into HCl ice, where it remains
in the protostellar stage. About 10% of chlorine is in gaseous atomic form.
Gas-phase HCl is a minor, but diagnostically key reservoir, with an abundance
of <1e-10 in most of the protostellar core. We find the 35Cl/37Cl ratio in
OMC-2 FIR 4 to be 3.2pm0.1, consistent with the solar system value. | | Source: | arXiv, 1411.6483 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER