|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
A line confusion limited millimeter survey of Orion KL. II: Silicon-bearing species | | B. Tercero
; L. Vincent
; J. Cernicharo
; S. Viti
; N. Marcelino
; | | Date: |
9 Dec 2010 | | Abstract: | We present a study of the Silicon-bearing species detected in a line
confusion limited survey towards Orion KL performed with the IRAM 30-m
telescope, which ranges from 80 to 280 GHz. Our aim is to derive physical and
chemical conditions for each family taking into account all observed lines from
all isotopologues of each species. We have modeled the lines of the detected
molecules using a radiative transfer code, which permit us to choose between
LVG and LTE approximations depending on the physical conditions of the gas. We
have used appropriate collisional rates for the LVG calculations. For the v=1
state of SiO we have detected the J=2-1 line and, for the first time in this
source, emission in the J=4-3 transition, both of them showing strong masering
effect. For SiO v=0, we have detected 28SiO, 29SiO, and 30SiO; in addition, we
have mapped the J = 5-4 SiO line. For SiS, we have detected the main species,
29SiS, and SiS v=1. Unlikely other species detected in Orion KL (IRc2), the
emission peak of SiS appears at a velocity of ~15.5 km s-1; a study of the 5-4
SiO line around IRc2 shows this feature as an extended component that probably
arises from the interaction of the outflow with the ambient cloud. We derive a
SiO/SiS column density ratio of ~13 in the plateau component. Besides, we
provide upper limits to the column density of several non-detected
Silicon-bearing species. The results of our chemical models show that while it
is possible to reproduce SiO in the gas phase (as well as on the grains), SiS
is a product of surface reactions, most likely involving direct reactions of S
with Si. | | Source: | arXiv, 1012.1969 | | 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