A Multi-Wavelength Investigation of the Unidentified Gamma-Ray Source HESS J1708-410

TL;DR

This study combines X-ray, radio, and molecular data with spectral energy distribution modeling to investigate the nature of the unidentified gamma-ray source HESS J1708-410, setting constraints on its emission mechanisms and environment.

Contribution

It provides the first multi-wavelength observational analysis and modeling of HESS J1708-410, offering new insights into its possible distance, emission processes, and surrounding medium.

Findings

No significant extended X-ray emission detected.

Upper limits established for radio flux at multiple frequencies.

A plausible distance of 3 kpc inferred from CO data.

Abstract

We report on recent XMM-Newton observations, archival radio continuum and CO data, and SED modeling of the unidentified Galactic plane source HESS J1708-410. No significant extended X-ray emission is observed, and we place an upper limit of 3.2 x 10{-13} erg cm{-2} s{-1} in the 2-4 keV range for the region of TeV emission. Molonglo Galactic Plane Survey data is used to place an upper limit of 0.27 Jy at 843 MHz for the source, with a 2.4 GHz limit of 0.4 Jy from the Parkes survey of the southern Galactic plane. 12CO (J 1->0) data of this region indicates a plausible distance of 3 kpc for HESS J1708-410. SED modeling of both the H.E.S.S. detection and flux upper limits offer useful constraints on the emission mechanisms, magnetic field, injection spectrum, and ambient medium surrounding this source.