| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
W43: the closest molecular complex of the Galactic Bar? | Q. Nguyen Long
; F. Motte
; F. Schuller
; N. Schneider
; S. Bontemps
; P. Schilke
; K. M. Menten
; F. Heitsch
; F. Wyrowski
; P. Carlhoff
; L. Bronfman
; T. Henning
; | Date: |
17 Feb 2011 | Abstract: | We used a large database extracted from Galaxy-wide surveys of H {scriptsize
I}, $^{13}$CO 1-0, $8 micron$ and $870 micron$ continuum to trace diffuse
atomic gas, low- to medium-density molecular gas, high-density molecular gas,
and star formation activity which we complemented by dedicated $^{12}$CO 2--1,
3--2 observations of the W43 region. From the detailed 3D
(space-space-velocity) analysis of the molecular and atomic cloud tracers
through the region and despite its wide velocity range (emph{FWHM}$sim22.3
kms$ around $vlsrsim 95.9 kms$), we identified W43 as a large (equivalent
diameter $sim 140$ pc) and coherent complex of molecular clouds which is
surrounded by an atomic gas envelope (equivalent diameter $sim 290$ pc). We
measured the total mass of this newly-identified molecular complex ($M_{{ iny
total}}sim 7.1 imes 10^6 msun$), the mass contained in dense $870 micron$
clumps ($<5$ pc dense cloud structures, $M_{{ iny clumps}}sim 8.4 imes 10^5
msun$) and conclude that W43 is particularly massive and concentrated. The
distance we assume for the W43 complex is 6 kpc from the Sun, which may place
it at the meeting point of the Scutum-Centaurus (or Scutum-Crux) Galactic arm
and the Bar, a dynamically complex region where high-velocity streams could
easily collide. The star formation rate of W43 is suggested not to be steady
but it is increasing from $, sim 0.01 msun, {yr}^{-1}$ (measured from its
$8,mu$m luminosity) to $sim 0.1 msun, {yr}^{-1}$ (measured from its
molecular content). From the global properties of W43, we claim it is an
extreme molecular complex in the Milky Way and it could even be forming
starburst clusters in the near future. | Source: | arXiv, 1102.3460 | 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 claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |