* Astronomy

Title: Supernova Remnant Kesteven 27: Interaction with A Neighbour HI Cloud Viewed by Fermi
Author: Yi Xing, Zhongxiang Wang, Xiao Zhang, Yang Chen

We report on the likely detection of gamma-ray emission from the young supernova remnant (SNR) Kesteven 27 (Kes 27). We analyze 5.7 yr Fermi Large Area Telescope data of the SNR region and find a point source at a position consistent with the radio brightness peak of Kes 27, which is located in the eastern region of the SNR and caused by the interaction with a nearby HI cloud. The source's emission has a power-law spectrum with a photon index of 2.5±0.1 and a >0.2 GeV luminosity of 5.8X10³⁴ erg s^-1 at a distance of 4.3 kpc. Comparing the properties of the source with that of other SNRs that are known to be interacting with nearby high-density clouds, we discuss the origin of the source's emission. The spectral energy distribution of the source can be described by a hadronic model that considers the interaction of protons, escaping from the shock front, with a high-density cloud.

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