Discovery of a New X-ray Filled Radio Supernova Remnant Around the Pulsar Wind Nebula in 3EG J1809-2328

TL;DR

This paper reports the discovery of a new supernova remnant associated with a pulsar wind nebula, identified through radio and X-ray observations, and its connection to a gamma-ray source, expanding understanding of mixed-morphology SNRs.

Contribution

The study identifies a new supernova remnant G7.5-1.7 associated with a PWN and gamma-ray source, highlighting its mixed-morphology features and its significance among similar remnants.

Findings

Discovery of a ~2° radio shell coincident with the PWN.

Identification of the SNR G7.5-1.7 as a mixed-morphology remnant.

Association of the SNR with a bright GeV gamma-ray source.

Abstract

We report the discovery of a partial ~2deg. diameter non-thermal radio shell coincident with Taz, the pulsar wind nebula (PWN) in the error box of the apparently variable gamma-ray source 3EG J1809-2328. We propose that this radio shell is a newly identified supernova remnant (SNR G7.5-1.7) associated with the PWN. The SNR surrounds an amorphous region of thermal X-rays detected in archival ROSAT and ASCA observations putting this system in the mixed-morphology class of supernova remnants. G7.5-1.7 is the fifth such supernova remnant coincident with a bright GeV source, and the fourth containing a pulsar wind nebulae.