2010A&A...520A..84P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.16CET14:58:50

2010A&A...520A..84P - Astronomy and Astrophysics, volume 520, A84-84 (2010/9-2)

W49A: a starburst triggered by expanding shells.

PENG T.-C., WYROWSKI F., VAN DER TAK F.F.S., MENTEN K.M. and WALMSLEY C.M.

Abstract (from CDS):

W49A is a giant molecular cloud which harbors some of the most luminous embedded clusters in the Galaxy. However, the explanation for this starburst-like phenomenon is still under debate. We investigated large-scale Spitzer mid-infrared images together with a Galatic Ring Survey 13CO J=1-0 image, complemented with higher resolution (∼11'') 13CO J=2-1 and C18O J=2-1 images over a ∼15x13pc2 field obtained with the IRAM 30m telescope. Two expanding shells have been identified in the mid-infrared images, and confirmed in the position-velocity diagrams made from the 13CO J=2-1 and C18O J=2-1 data. The mass of the averaged expanding shell, which has an inner radius of ≃3.3pc and a thickness of ≃0.41pc, is about 1.9x104M. The total kinetic energy of the expanding shells is estimated to be ∼1049erg, which is probably provided by a few massive stars, whose radiation pressure and/or strong stellar winds drive the shells. The expanding shells are likely to have a common origin close to the two ultracompact HII regions (source O and source N), and their expansion speed is estimated to be ∼5km/s, resulting in an age of ∼3-7x105 years. In addition, on larger (∼35x50pc2) scales, remnants of two gas ejections have been identified in the 13CO J=1-0 data. Both ejections seem to have the same center as the expanding shells with a total energy of a few times 1050erg. The main driving mechanism for the gas ejections is unclear, but likely related to the mechanism which triggers the starburst in W49A.

Abstract Copyright:

Journal keyword(s): stars formation - HII regions - ISM: bubbles

Simbad objects: 26

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Number of rows : 26

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 Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11094 0
2 4C 09.57 BLL 17 51 32.81857318 +09 39 00.7284829   17.46 16.78 15.57   ~ 790 1
3 [MKJ2009] G43.099+0.050 MoC 19 09 57.4 +09 03 42           ~ 2 0
4 [MKJ2009] G43.108+0.044 MoC 19 09 59.8 +09 03 58           ~ 2 0
5 OH 43.13 +0.04 Mas 19 10 03.2 +09 04 44           ~ 3 0
6 IRAS 19077+0856 IR 19 10 06.3 +09 01 12           ~ 2 0
7 [DJW84] W49 AA Rad 19 10 07.71 +09 05 44.5           ~ 5 0
8 [DJW84] W49 Q HII 19 10 10.51 +09 05 11.9           ~ 12 1
9 [DJW84] W49 BB Rad 19 10 10.62 +09 05 45.6           ~ 4 0
10 NAME W 49A SW Cluster Cl* 19 10 11 +09 05.7           ~ 4 0
11 [DJW84] W49 CC Rad 19 10 11.72 +09 06 33.5           ~ 5 0
12 [DJW84] W49 S HII 19 10 11.73 +09 05 27.2           ~ 11 1
13 W 49n HII 19 10 13.2 +09 06 12           ~ 404 3
14 [DJW84] W49 GG Rad 19 10 13.67 +09 06 50.0           ~ 3 0
15 [DJW84] W49 N HII 19 10 15.38 +09 06 14.9           ~ 8 0
16 W 49a SFR 19 10 15.7 +09 06 05           ~ 255 2
17 [DJW84] W49 O Rad 19 10 16.34 +09 06 07.1           ~ 8 0
18 [DJW84] W49 P HII 19 10 16.82 +09 05 50.6           ~ 4 0
19 [DJW84] W49 JJ Rad 19 10 18.54 +09 06 09.0           ~ 3 0
20 W 49 SFR 19 10 20 +09 07.7           ~ 502 1
21 NAME W 49A South HII 19 10 21.6 +09 05 03           ~ 51 2
22 [DJW84] W49 MM Rad 19 10 23.34 +09 06 04.3           ~ 3 0
23 AGAL G043.226-00.039 Y*O 19 10 30.6 +09 07 55           ~ 5 0
24 IRAS 19081+0903 HII 19 10 34.0 +09 08 01           ~ 23 0
25 W 49b SNR 19 11 09.000 +09 06 24.00           ~ 384 1
26 [DJW84] W49 DD HII ~ ~           ~ 5 0

    Equat.    Gal    SGal    Ecl

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2019.12.16-14:58:50

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