2018A&A...611A..77Y


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST08:02:34

2018A&A...611A..77Y - Astronomy and Astrophysics, volume 611A, 77-77 (2018/3-1)

Diffuse γ-ray emissionin the vicinity of young star cluster Westerlund 2.

YANG R.-Z., DE ONA WILHELMI E. and AHARONIAN F.

Abstract (from CDS):

We report the results of our analysis of the publicly available data obtained by the Large Area Telescope (LAT) on board the Fermi satellite towards the direction of the young massive star cluster Westerlund 2. We found significant extended γ-ray emission in the vicinity of Westerlund 2 with a hard power-law energy spectrum extending from 1 to 250GeV with a photon index of 2.0±0.1. We argue that amongst several alternatives, the luminous stars in Westerlund 2 are likely sites of acceleration of particles responsible for the diffuse γ-ray emission of the surrounding interstellar medium. In particular, the young star cluster Westerlund 2 can provide sufficient non-thermal energy to account for the γ-ray emission. In this scenario, since the γ-ray production region is significantly larger than the area occupied by the star cluster, we conclude that the γ-ray production is caused by hadronic interactions of accelerated protons and nuclei with the ambient gas. In that case, the total energy budget in relativistic particles is estimated of the order of 1050erg.

Abstract Copyright: © ESO 2018

Journal keyword(s): gamma rays: ISM - cosmic rays

CDS comments: G287.393-00.630 is probably [ABB2014] WISE G287.374+00.646 in SIMBAD.

Simbad objects: 25

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Number of rows : 25

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 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5610 4
2 NAME 30 Dor C Superbubble Rad 05 35 50.8 -69 12 22           ~ 41 1
3 PSR J1016-58 Psr 10 16 21.266 -58 57 11.70           ~ 86 3
4 SNR G284.3-01.8 Rad 10 18.3 -59 00           ~ 101 2
5 3FHL J1018.8-5857 HXB 10 19 02.270 -58 56 29.87           ~ 92 0
6 PSR J1019-5749 Psr 10 19 52.14 -57 49 05.9           ~ 24 0
7 HESS J1023-575 gam 10 23 -57.5           ~ 53 0
8 PSR J1023-5746 Psr 10 23 02.388 -57 46 09.86           ~ 48 0
9 V* V712 Car bL* 10 23 58.0120989646 -57 45 48.938103165 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 148 1
10 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 282 0
11 GUM 29 HII 10 24 14.6 -57 46 58           ~ 192 0
12 WR 20b WR* 10 24 18.3972653285 -57 48 29.778301585     13.7 12.0   WN6ha 47 0
13 PSR J1028-5819 Psr 10 28 27.888 -58 19 06.14           ~ 88 1
14 SNR G286.5-01.2 Rad 10 35.7 -59 42           ~ 15 1
15 FGES J1036.4-5834 gam 10 36.4 -58 34           ~ 2 0
16 PSR J1044-5737 Psr 10 44 32.791 -57 37 19.39           ~ 28 0
17 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2209 0
18 [ABB2014] WISE G287.374+00.646 HII 10 48 06 -58 27.0           ~ 1 0
19 PSR B1046-58 Psr 10 48 12.391 -58 32 02.68           ~ 230 0
20 PSR J1055-6028 Psr 10 56 11.87 -60 27 12.7           ~ 28 1
21 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 947 1
22 Cl Westerlund 1 OpC 16 47 04.00 -45 51 04.9           ~ 468 0
23 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11613 0
24 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 622 1
25 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 794 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-08:02:34

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