Sub-arcsecond radio and optical observations of the likely counterpart to the gamma-ray source 2FGL J2056.7+4939

TL;DR

This study identifies a likely extragalactic counterpart to the gamma-ray source 2FGL J2056.7+4939 through multi-wavelength observations, revealing a point-like optical/infrared source with flat-spectrum radio emission.

Contribution

The paper provides the first detailed multi-wavelength analysis pinpointing a probable extragalactic counterpart to the gamma-ray source.

Findings

Identified a point-like optical/infrared source consistent with gamma-ray and X-ray data.

Detected marginally resolved radio structure at sub-arcsecond resolution.

Supported an extragalactic origin for the source.

Abstract

We have searched and reviewed all multi- wavelength data available for the region towards the gamma-ray source 2FGL J2056.7+4939 in order to con- strain its possible counterpart at lower energies. As a result, only a point-like optical/infrared source with flat-spectrum radio emission is found to be consistent with all X-ray and gamma-ray error circles. Its struc- ture is marginally resolved at radio wavelengths at the sub-arcsecond level. An extragalactic scenario appears to be the most likely interpretation for this object.