2011A&A...532A..92L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:59:41

2011A&A...532A..92L - Astronomy and Astrophysics, volume 532A, 92-92 (2011/8-1)

Infrared and radio study of the W 43 cluster. Resolved binaries and non-thermal emission.

LUQUE-ESCAMILLA P.L., MUNOZ-ARJONILLA A.J., SANCHEZ-SUTIL J.R., MARTI J., COMBI J.A. and SANCHEZ-AYASO E.

Abstract (from CDS):

The recent detection of very high-energy (VHE) gamma-ray emission from the direction of the W43 star-forming region prompted us to investigate its stellar population in detail in an attempt to see wether or not it is possible an association. We search for the possible counterpart(s) of the gamma-ray source or any hints of them, such as non-thermal synchrotron emission as a tracer of relativistic particles often involved in plausible physical scenarios for VHE emission. We data-mined several archival databases with different degrees of success. The most significant results came from radio and near-infrared archival data. The previously known Wolf-Rayet star in the W43 central cluster and another cluster member appear to be resolved into two components,suggesting a likely binary nature. In addition, extended radio emission with a clearly negative spectral index is detected in coincidence with the W43 cluster. These findings could have important implications for possible gamma-ray emitting scenarios, which we also briefly discuss.

Abstract Copyright:

Journal keyword(s): stars: Wolf-Rayet - X-rays: stars - radio continuum: stars - gamma rays: stars - infrared: stars

Nomenclature: Figs 2-4, Table 1: [LMS2011] W43 Na (Nos 1a-1b, 3a-3b).

Simbad objects: 13

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Number of rows : 13

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 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 277 0
2 0FGL J1846.6-0138 gam 18 46 36.0 -01 38 00           ~ 1 0
3 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 437 0
4 NAME W 43 Star Cluster Cl* 18 47 36 -01 56.5           ~ 9 1
5 [LMS2011] W43 3b * 18 47 36.648 -01 56 36.08           O 1 0
6 [LMS2011] W43 1b * 18 47 36.653 -01 56 33.22           O 1 0
7 2MASS J18473666-0156334 ** 18 47 36.670 -01 56 33.46           WN7 24 0
8 [LMS2011] W43 3a * 18 47 36.677 -01 56 36.11           OI 1 0
9 [LMS2011] W43 1a WR* 18 47 36.691 -01 56 33.06           ~ 1 0
10 0FGL J1848.6-0138 gam 18 48 18.89 -01 40 49.1           ~ 27 1
11 HESS J1848-018 gam 18 48.5 -01 48           ~ 22 0
12 [BDC99] W43 2 **? ~ ~           O 4 0
13 [BDC99] W43 3 * ~ ~           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:59:41

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