2025ApJ...992....1A

Query : 2025ApJ...992....1A

2025ApJ...992....1A - Astrophys. J., 992, 1-13 (2025/October-2)

Detection of Diffuse Radio Emission inside the Supernova Remnant G338.3-0.0 Associated with the γ-Ray Source HESS J1640-465.

ABDELMAGUID M., GELFAND J.D. and ALFORD J.A.J.

Abstract (from CDS):

We report the discovery of diffuse radio emission within SNR G338.3-0.0 using new MeerKAT observations at 816 MHz and 1.4 GHz. The radio emission spatially overlaps with the X-ray pulsar wind nebula (PWN) powered by PSR J1640-4631 and the GeV/TeV γ-ray source HESS J1640-465. The morphology of this radio emission is centrally peaked and its extent is well contained within the SNR shell. A lack of mid- and far-infrared counterparts and the absence of cataloged H II regions argue against a thermal origin, while the morphology and radial profile are suggestive of a PWN origin powered by PSR J1640-4631. Under this assumption, we use a one-zone, time-dependant model to reproduce the size and broadband (radio, X-ray, and γ-ray) spectral energy distribution of the PWN. The modeling and broadband properties of this PWN suggest it is currently interacting with the reverse shock within its host SNR. This evolutionary stage is associated with particles escaping the PWN and entering the interstellar medium, suggesting this object may be an important source of Galactic PeV e±.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Millisecond pulsars - Rotation powered pulsars - Pulsars - Neutron stars - Supernova remnants - Radio astronomy - Pulsar wind nebulae - Gamma-ray sources

Simbad objects: 17

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Number of rows : 17
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 ICRF J040820.3-654509 Sy2 04 08 20.37884 -65 45 09.0806     18.0     ~ 207 1
2 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
3 PSR J0855-4644 Psr 08 55 36.160 -46 44 13.46           ~ 62 1
4 SNR G304.6+00.1 SNR 13 05 59 -62 42.0           ~ 93 0
5 SNR G319.9-00.7 SNR 15 09 14.0 -58 54 51           ~ 13 0
6 Kes 25 SNR 15 53 00.000 -56 10 00.00           ~ 136 0
7 SNR G327.1-01.1 SNR 15 54 32.3 -55 03 44           ~ 112 1
8 SNR G328.4+00.2 SNR 15 55 30 -53 17.0           ~ 72 1
9 4FGL J1639.8-4642c gam 16 39 48.8 -46 42 51           ~ 8 0
10 [MCM2005b] 81 OpC 16 40 29.60 -46 23 25.6           ~ 26 0
11 SNR G338.3-00.0 SNR 16 40 43.2 -46 31 48           ~ 175 2
12 PSR J1640-4631 Psr 16 40 43.52 -46 31 35.4           ~ 65 0
13 HESS J1641-463 gam 16 41 01.7 -46 18 11           ~ 27 0
14 PSR J1826-1256 Psr 18 26 08.570 -12 56 33.53           ~ 152 1
15 SNR G046.8-00.3 SNR 19 18 10 +12 09.0           ~ 75 0
16 SNR G054.1+00.3 SNR 19 30 10.6 +18 50 22           ~ 271 1
17 NAME Boomerang PWN G106.6+2.9 SNR 22 27 50.9 +61 02 54           ~ 52 1

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