2024MNRAS.530.1144G

Query : 2024MNRAS.530.1144G

2024MNRAS.530.1144G - Mon. Not. R. Astron. Soc., 530, 1144-1150 (2024/May-1)

GeV γ-ray emission in the field of young massive star cluster RCW 38.

GE T.-T., SUN X.-N., YANG R.-Z., TAM P.-H.T., LU M.-X. and LIANG E.-W.

Abstract (from CDS):

We report the detection of γ-ray emission by the Fermi Large Area Telescope towards the young massive star cluster RCW 38 in the 1-500 GeV photon energy range. We found spatially extended GeV emission towards the direction of RCW 38, which is best modelled by a Gaussian disc of 0.23° radius with a significance of the extension of ∼11.4σ. Furthermore, the spatial correlation with the ionized and molecular gas content favours the hadronic origin of the γ-ray emission. The γ-ray spectrum of RCW 38 has a relatively hard photon index of 2.44 ± 0.03, which is similar to other young massive star clusters. We argue that the diffuse GeV γ-ray emission in this region likely originates from the interaction of accelerated protons in the stellar cluster with the ambient gas.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): cosmic rays - open clusters and associations: individual: RCW 38 - gamma-rays: ISM

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
2 NAME Puppis reg 07 40 -28.0           ~ 108 0
3 NAME GUM Nebula ISM 07 43 -42.1           ~ 454 1
4 NAME Vela SNR 08 34.0 -45 50           ~ 1331 2
5 NAME Vela Jr SN SNR 08 52.0 -46 20           ~ 507 2
6 NAME VELA MOL RIDGE MoC 08 53 -45.0           ~ 178 0
7 PSR J0855-4658 Psr 08 55 19.57 -46 58 22.6           ~ 10 0
8 PSR J0855-4644 Psr 08 55 36.160 -46 44 13.46           ~ 62 1
9 4FGL J0856.0-4724c gam 08 56 02.8 -47 24 36           ~ 2 0
10 RCW 36 HII 08 59 00.9 -43 44 10     15.20     ~ 161 0
11 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 327 2
12 3FGL J0859.3-4732 gam 08 59 13 -47 29.3           ~ 12 0
13 1FGL J0902.5-4731c Bz? 09 02 33.4 -47 27 13           ~ 16 0
14 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49           ~ 400 0
15 NAME Carina Molecular Cloud Complex MoC 10 43 10 -59 38.2           ~ 97 0
16 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
17 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
18 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
19 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
20 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 255 2
21 RSGC 1 OpC 18 37 58 -06 53.0           ~ 117 0
22 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1

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