2023ApJ...945...21L

Query : 2023ApJ...945...21L

2023ApJ...945...21L - Astrophys. J., 945, 21 (2023/March-1)

Advanced γ-Ray Emission Studies of G15.4+0.1 with Fermi-LAT: Evidence of Escaping Cosmic Rays Interacting with Surrounding Molecular Clouds.

LI Y., XIN Y., LIU S. and HE Y.

Abstract (from CDS):

We present an analysis of γ-ray emission in the direction of supernova remnant (SNR) G15.4+0.1 with 13 yr Fermi Large Area Telescope data. There are three point-like GeV sources in this region: one is spatially coincident with the TeV source HESS J1818-154 and is interpreted as the counterpart of HESS J1818-154. Its γ-ray spectrum can be well fitted by a single power law with an index of 2.3. The other two sources with log-parabola spectra are spatially coincident with dense regions of surrounding molecular clouds revealed by CO observations. Their γ-ray emission originates from hadronic π0 decay due to inelastic collisions between nuclei in the clouds and cosmic rays accelerated in and escaping from SNR G15.4+0.1. The total energy of the escaping protons is about 1048 erg, assuming a point-like instantaneous injection. However, the inferred diffusion coefficients are lower than the typical Galactic value.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-ray sources - Gamma-ray astronomy - Supernova remnants

Simbad objects: 11

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Number of rows : 11
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 SNR G338.3-00.0 SNR 16 40 43.2 -46 31 48           ~ 175 2
3 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
4 HESS J1818-154 gam 18 16.1 -15 12           ~ 17 0
5 SNR G015.4+00.1 SNR 18 18.0 -15 27           ~ 39 1
6 3FGL J1818.7-1528 gam 18 18 37.9 -15 33 41           ~ 9 0
7 3FGL J1820.3-1529c gam 18 19 57.6 -15 30 10           ~ 11 0
8 PSR B1823-13 Psr 18 26 13.06 -13 34 48.1           ~ 460 1
9 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
10 SNR G049.1-00.1 SNR 19 23 19.300 +14 09 21.00           ~ 309 0
11 * gam Cyg V* 20 22 13.7018357 +40 15 24.044963 3.44 2.90 2.23 1.74 1.40 F8Ib 607 0

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