2024ApJ...961..213G

Query : 2024ApJ...961..213G

2024ApJ...961..213G - Astrophys. J., 961, 213 (2024/February-1)

Energy-dependent Analyses of the Gamma-Ray Emission from HESS J1857+026 with Fermi-LAT.

GUO X., LIU X. and XIN Y.

Abstract (from CDS):

We report the discovery of the energy-dependent morphology of the GeV gamma-ray emission from HESS J1857+026 with more than 13 yr of Fermi Large Area Telescope data. The GeV gamma-ray emission from this region is composed of two extended components. The hard component with an index of 1.74 ± 0.07 in the energy range of 0.5-500 GeV is spatially coincident with HESS J1857+026, and its 68% containment radius varies from ∼0.°44 below 40 GeV to ∼0.°30 above 140 GeV. The hard GeV gamma-ray spectrum and the energy-dependent morphology of HESS J1857+026 make it favor a pulsar wind nebula origin, which is associated with the energetic pulsar PSR J1856+0245. The soft component with an index of 2.70 ± 0.16 and another extended gamma-ray source detected in this region, 4FGL J1857.9+0313e, with an index of 2.55 ± 0.07, are spatially coincident with two molecular clumps in the northeast and southwest of HESS J1857+026, which favors the hadronic process, and the protons could be accelerated by the hypothetical supernova remnant associated with PSR J1856+0245.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-ray sources - Pulsar wind nebulae - Supernova remnants - Molecular clouds - Gamma-rays

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 IC 443 SNR 06 17 00.0000000 +22 34 11.998901           ~ 1314 1
2 PSR J0633+1746 Psr 06 33 54.153 +17 46 12.91           ~ 1308 0
3 PSR B0656+14 Psr 06 59 48.18800 +14 14 19.2000   24.85 24.90     ~ 943 1
4 PSR J1301-6305 Psr 13 02 47.9992676 -63 10 48.001099           ~ 139 2
5 PSR B1823-13 Psr 18 26 13.06 -13 34 48.1           ~ 460 1
6 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
7 PSR J1856+0245 Psr 18 56 50.80 +02 45 50.2           ~ 51 0
8 4FGL J1857.7+0246e Psr 18 57 11.0 +02 40 00           ~ 59 0
9 MAGIC J1857+026 Psr 18 57.2 +02 38           ~ 9 0
10 PSR J1857+0300 Psr 18 57 16.91 +03 00 26.0           ~ 6 0
11 MAGIC J1857+029 gam 18 57.6 +02 58           ~ 11 0
12 EGR J1856+0235 gam 18 57 37.16 +02 12 33.6           ~ 32 0
13 4FGL J1857.9+0313 Bz? 18 57 54.8 +03 13 07           ~ 13 0
14 SNR G035.6-00.4 SNR 18 57 55 +02 13.0           ~ 56 1
15 4FGL J1858.3+0209 gam 18 58 18.4 +02 09 10           ~ 10 0
16 HESS J1858+020 gam 18 58 20.0 +02 05 24           ~ 45 0
17 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1

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