2010ApJ...709..975O


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST09:44:46

2010ApJ...709..975O - Astrophys. J., 709, 975-982 (2010/February-1)

Temperature and density distribution in the molecular gas toward westerlund 2: further evidence for physical association.

OHAMA A., DAWSON J.R., FURUKAWA N., KAWAMURA A., MORIBE N., YAMAMOTO H., OKUDA T., MIZUNO N., ONISHI T., MAEZAWA H., MINAMIDANI T., MIZUNO A. and FUKUI Y.

Abstract (from CDS):

Furukawa et al. reported the existence of a large mass of molecular gas associated with the super star cluster Westerlund 2 and the surrounding H II region RCW49, based on a strong morphological correspondence between NANTEN2 12CO(J = 2-1) emission and Spitzer IRAC images of the H II region. We here present temperature and density distributions in the associated molecular gas at ∼3.5 pc resolution, as derived from a large velocity gradient analysis of the 12CO(J = 2-1), 12CO(J = 1-0), and 13CO(J = 2-1) transitions. The kinetic temperature is as high as ∼60-150 K within a projected distance of ∼5-10 pc from Westerlund 2 and decreases to as low as ∼10 K away from the cluster. The high temperature provides robust verification that the molecular gas is indeed physically associated with the H II region, supporting Furukawa et al.'s conclusion. The derived temperature is also roughly consistent with theoretical calculations of photodissociation regions (PDRs), while the low spatial resolution of the present study does not warrant a more detailed comparison with PDR models. We suggest that the molecular clouds presented here will serve as an ideal laboratory to test theories on PDRs in future higher resolution studies.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: individual objects: RCW49 - open clusters and associations: individual: Westerlund 2

Status at CDS:  

Simbad objects: 11

goto Full paper

goto View the reference in ADS

Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 1986 1
2 NAME Car Arm PoG 10 00 -60.0           ~ 377 1
3 HESS J1023-575 gam 10 23 -57.5           ~ 53 0
4 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 274 0
5 GUM 29 HII 10 24 14.6 -57 46 58           ~ 191 0
6 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1025 1
7 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 460 0
8 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 300 0
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11439 0
10 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 626 0
11 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 439 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2010ApJ...709..975O and select 'bookmark this link' or equivalent in the popup menu


2020.05.27-09:44:46

© Université de Strasbourg/CNRS

    • Contact