2025ApJ...981...33X

Query : 2025ApJ...981...33X

2025ApJ...981...33X - Astrophys. J., 981, 33 (2025/March-1)

The GeV γ-Ray Emission from the Composite Supernova Remnant CTB 87.

XIN Y., TANG J., DING W., LIU X., ZHANG Y. and GUO X.

Abstract (from CDS):

We report the GeV γ-ray emission around the composite supernova remnant (SNR) CTB 87 with more than 16 yr of PASS 8 data recorded by the Fermi Large Area Telescope. Two separate point sources with different GeV spectra are identified in this region: one has a soft γ-ray spectrum, likely due to interactions between the SNR shock and molecular clouds, and another source with a hard GeV γ-ray spectrum aligns with the TeV spectrum of VER J2016+371, suggesting it as the GeV counterpart. Considering the observations of CTB 87 in the radio and X-ray bands, VER J2016+371 is proposed to originate from the pulsar wind nebula (PWN) associated with PSR J2016+3711. A leptonic model with a broken power-law electron distribution could explain the multiwavelength data of VER J2016+371, with fitted parameters matching typical γ-ray PWNe. Deeper searching for the SNR shock of CTB 87 in other bands and the future TeV observations by LHAASO and Cherenkov Telescope Array are crucial to reveal the nature of CTB 87.

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

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

Simbad objects: 15

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Number of rows : 15
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 NAME Vela X Psr 08 33 08.880 -45 11 24.36           ~ 302 1
3 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2446 1
4 PSR J1357-6429 Psr 13 57 02.525 -64 29 29.89           ~ 171 1
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 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 309 0
8 QSO J2015+371 BLL 20 15 28.72978661 +37 10 59.5147372     21.82 21.4   ~ 324 2
9 SNR G074.9+01.2 SNR 20 16 02.4 +37 12 48           ~ 195 2
10 PSR J2016+3711 Psr 20 16 09.14 +37 11 10.4           ~ 6 0
11 CXOU J201609.2+371110 X 20 16 09.20 +37 11 10.5           ~ 13 0
12 4FGL J2016.2+3712 gam 20 16 13.7 +37 12 47           ~ 12 0
13 NAME XTD2025 NewPS1 gam 20 17 12.9 +36 49 08           ~ 1 0
14 NAME XTD2025 NewPS2 gam 20 20 38.9 +37 38 31           ~ 1 0
15 NAME XTD2025 NewPS3 gam 20 24 53.8 +35 34 20           ~ 1 0

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