|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
27 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
The Green Bank Ammonia Survey (GAS): First Results of NH3 mapping the Gould Belt | | Rachel K. Friesen
; Jaime E. Pineda
; Erik Rosolowsky
; Felipe Alves
; Ana Chacón-Tanarro
; Hope How-Huan Chen
; Michael Chun-Yuan Chen
; James Di Francesco
; Jared Keown
; Helen Kirk
; Anna Punanova
; Youngmin Seo
; Yancy Shirley
; Adam Ginsburg
; Christine Hall
; Stella S. R. Offner
; Ayushi Singh
; Héctor G. Arce
; Paola Caselli
; Alyssa A. Goodman
; Peter G. Martin
; Christopher Matzner
; Philip C. Myers
; Elena Redaelli
; | | Date: |
20 Apr 2017 | | Abstract: | We present an overview of the first data release (DR1) and first-look science
from the Green Bank Ammonia Survey (GAS). GAS is a Large Program at the Green
Bank Telescope to map all Gould Belt star-forming regions with $A_V gtrsim 7$
mag visible from the northern hemisphere in emission from NH$_3$ and other key
molecular tracers. This first release includes the data for four regions in
Gould Belt clouds: B18 in Taurus, NGC 1333 in Perseus, L1688 in Ophiuchus, and
Orion A North in Orion. We compare the NH$_3$ emission to dust continuum
emission from Herschel, and find that the two tracers correspond closely.
NH$_3$ is present in over 60\% of lines-of-sight with $A_V gtrsim 7$ mag in
three of the four DR1 regions, in agreement with expectations from previous
observations. The sole exception is B18, where NH$_3$ is detected toward ~ 40\%
of lines-of-sight with $A_V gtrsim 7$ mag. Moreover, we find that the NH$_3$
emission is generally extended beyond the typical 0.1 pc length scales of dense
cores. We produce maps of the gas kinematics, temperature, and NH$_3$ column
densities through forward modeling of the hyperfine structure of the NH$_3$
(1,1) and (2,2) lines. We show that the NH$_3$ velocity dispersion,
${sigma}_v$, and gas kinetic temperature, $T_K$, vary systematically between
the regions included in this release, with an increase in both the mean value
and spread of ${sigma}_v$ and $T_K$ with increasing star formation activity.
The data presented in this paper are publicly available. | | Source: | arXiv, 1704.6318 | | 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