|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Chemical and radiative transfer modeling of the ISO-LWS Fabry-Perot spectra of Orion-KL water line | | M. R. Lerate
; J. A. Yates
; M. J. Barlow
; S. Viti
; B. M. Swinyard
; | | Date: |
10 Feb 2010 | | Abstract: | We present chemical and radiative transfer models for the many far-IR ortho-
and para-H$_{2}$O lines that were observed from the Orion-KL region in high
resolution Fabry-Perot (FP) mode by the Long Wavelength Spectrometer (LWS) on
board the Infrared Space Observatory (ISO). The chemistry of the region was
first studied by simulating the conditions in the different known components of
Orion-KL: chemical models for a hot core, a plateau and a ridge were coupled
with an accelerated Lambda$-iteration (ALI) radiative transfer model to predict
H$_2$O line fluxes and profiles. Our models include the first 45 energy levels
of ortho- and para-H$_{2}$O. We find that lines arising from energy levels
below 560 K were best reproduced by a gas of density 3$ imes10^{5}$ cm$^{-3}$
at a temperature of 70-90 K, expanding at a velocity of 30 km s$^{-1}$ and with
a H$_{2}$O/H$_{2}$ abundance ratio of the order of 2 - 3 $ imes$ 10$^{-5}$,
similar to the abundance derived by Cernicharo et al. (2006). However, the
model that best reproduces the fluxes and profiles of H$_{2}$O lines arising
from energy levels above 560 K has a significantly higher H$_{2}$O/H$_{2}$
abundance, 1 - 5 $ imes$ 10$^{-4}$, originating from gas of similar density,
in the Plateau region, that has been heated to 300 K, relaxing to 90-100 K. We
conclude that the observed water lines do not originate from high temperature
shocks. | | Source: | arXiv, 1002.2111 | | 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