# Discovery of a point-like very-high-energy gamma-ray source in Monoceros

## TL;DR

This paper reports the discovery of a new very-high-energy gamma-ray source near the Monoceros SNR, using H.E.S.S. observations, with potential associations to X-ray and lower-energy gamma-ray sources, but no clear molecular cloud counterpart.

## Contribution

The study presents the first detection of a point-like VHE gamma-ray source in the Monoceros region with no prior identification at other wavelengths.

## Key findings

- Discovery of gamma-ray source HESS J0632+058 near Monoceros SNR
- No associated molecular cloud detected in CO data
- Possible links to X-ray and lower-energy gamma-ray sources

## Abstract

The complex Monoceros Loop SNR/Rosette Nebula region contains several potential sources of very-high-energy (VHE) gamma-ray emission and two as yet unidentified high-energy EGRET sources. Sensitive VHE observations are required to probe acceleration processes in this region. The H.E.S.S. telescope array has been used to search for very high-energy gamma-ray sources in this region. CO data from the NANTEN telescope were used to map the molecular clouds in the region, which could act as target material for gamma-ray production via hadronic interactions. We announce the discovery of a new gamma-ray source, HESS J0632+058, located close to the rim of the Monoceros SNR. This source is unresolved by H.E.S.S. and has no clear counterpart at other wavelengths but is possibly associated with the weak X-ray source 1RXS J063258.3+054857, the Be-star MWC 148 and/or the lower energy gamma-ray source 3EG J0634+0521. No evidence for an associated molecular cloud was found in the CO data.