On the nature of HESS J1503-582 revealed by the H.E.S.S. experiment: Coincidence with a FVW?

TL;DR

This paper reports on the H.E.S.S. discovery of a 'dark' gamma-ray source, HESS J1503-582, exploring its properties and potential association with a Forbidden-Velocity-Wing, suggesting a novel astrophysical phenomenon.

Contribution

It presents the first detailed analysis of HESS J1503-582 and proposes a possible link to a Forbidden-Velocity-Wing, offering new insights into unidentified gamma-ray sources.

Findings

Identification of HESS J1503-582 as a 'dark' gamma-ray source

Possible association with a Forbidden-Velocity-Wing structure

Implications for understanding unidentified very-high-energy sources

Abstract

The H.E.S.S. survey of the inner Galaxy in the very-high-energy gamma-ray domain has led to the discovery of many extended sources, some of which do not appear to be associated with any obvious counterpart at traditional wavelengths (radio, infrared and X-ray). In this contribution, preliminary H.E.S.S. results on one of these so-called "dark" sources, namely HESS J1503-582, are presented. After introducing the properties of this source candidate, results of the search for counterparts in several astronomical windows are shown. Finally, its possible association with a "Forbidden-Velocity-Wing", a characteristic 21 cm HI line structure that appears as a deviation from the canonical Galactic rotation curve, is discussed.