G17.8+16.7: A New Supernova Remnant

TL;DR

This paper reports the discovery and analysis of a new supernova remnant, G17.8+16.7, identified through non-thermal radio emission and gamma-ray observations, with estimated parameters and a leptonic emission model.

Contribution

The study confirms G17.8+16.7 as a new supernova remnant and provides constraints on its distance, age, and emission mechanisms using multi-wavelength data.

Findings

Supernova remnant G17.8+16.7 identified with 0.8° diameter.

Estimated distance range of 1.4-3.5 kpc.

SNR age approximately 10,000 years compatible with observations.

Abstract

Non-thermal radio emission is detected in the region of the gamma-ray source FHES J1723.5-0501. The emission has an approximately circular shape 0.8 degrees in diameter. The observations confirm its nature as a new supernova remnant, G17.8+16.7. We derive constraints on the source parameters using the radio data and gamma-ray observations of the region. The distance to the object is possibly in the range 1.4-3.5 kpc. An SNR age of the order of 10 kyr is compatible with the radio and GeV features, but an older or younger SNR cannot be ruled out. A simple one-zone leptonic model naturally explains the multi-wavelength non-thermal fluxes of the source at its location outside the Galactic plane.