Revisiting Gamma-Ray Emission of the Supernova Remnant RCW 103
| Autor: | Xing, Yi, Wang, Zhongxiang, Zheng, Dong |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We analyze more than 15 years of the \gr\ data, obtained with the Large Area Telescope (LAT) onboard {\it the Fermi Gamma-ray Space Telescope (Fermi)}, for the region of the young supernova remnant (SNR) RCW~103, since the nearby source 4FGL J1616.2$-$5054e, counterpart to HESS~J1616$-$518 and $\simeq$13\,arcmin away from the SNR, is determined to be extended in the more recent Fermi-LAT source catalog. Different templates for 4FGL J1616.2$-$5054e and RCW~103 are tested, and we find that a point source with a power-law (PL) spectrum at the southern limb of the SNR best describes the detected gamma-ray emission. The photon index of the PL emission is $\Gamma\simeq 2.31$(or $\alpha\simeq 2.4$ in a Log-Parabola model) , softer than the previously reported $\Gamma\simeq 2.0$ when the counterpart to HESS~J1616$-$518 was considered to be a point source (which likely caused mis-identification of extended emission at RCW~103). In order to produce the \gr\ emission in a hadronic scenario, we estimate that protons with an index$\sim$2.4 PL energy distribution are needed. These results fit with those from multi-wavelength observations that have indicated the remnant at the southern limb is interacting with a molecular cloud. Comment: 7 pages, 4 figures, 2 tables, accepted for publication in ApJ |
| Databáze: | arXiv |
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