Title: MeV–GeV Gamma-Ray Emission from SNR G327.1–1.1 Discovered by the Fermi-LAT

Abstract

Abstract We report the discovery of MeV–GeV γ -ray emission by the Fermi-LAT positionally coincident with the TeV pulsar wind nebula (PWN) HESS J1554–550 within the host supernova remnant (SNR) G327.1–1.1. The γ -ray emission is point-like and faint but significant (>4 σ ) in the 300 MeV–2 TeV energy range. We report here the Fermi-LAT analysis of the observed γ -ray emission followed by a detailed multiwavelength investigation to understand the nature of the emission. The central pulsar powering the PWN within G327.1–1.1 has not been detected in any wave band; however, it is likely embedded within the X-ray nebula, which is displaced from the center of the radio nebula. The γ -ray emission is faint and therefore a pulsation search to determine if the pulsar may be contributing is not feasible. Prior detailed multiwavelength reports revealed an SNR system that is old, τ ∼ 18,000 yr, where the interaction of the reverse shock with the PWN is underway or has recently occurred. We find that the γ -ray emission agrees remarkably well with a detailed broadband model constructed in a prior report based on independent hydrodynamical and semianalytic simulations of an evolved PWN. We further investigate the physicalmore » implications of the model for the PWN evolutionary stage incorporating the new Fermi-LAT data and attempt to model the distinct particle components based on a spatial separation analysis of the displaced PWN counterparts.« less

Authors:

Eagle, Jordan ;

• Search DOE PAGES for author "Eagle, Jordan"
• Search DOE PAGES for ORCID "0000-0001-9633-3165"

Castro, Daniel ;

• Search DOE PAGES for author "Castro, Daniel"
• Search DOE PAGES for ORCID "0000-0002-0394-3173"

Temim, Tea ;

• Search DOE PAGES for author "Temim, Tea"
• Search DOE PAGES for ORCID "0000-0001-7380-3144"

Ballet, Jean ;

• Search DOE PAGES for author "Ballet, Jean"
• Search DOE PAGES for ORCID "0000-0002-8784-2977"

Slane, Patrick ;

• Search DOE PAGES for author "Slane, Patrick"
• Search DOE PAGES for ORCID "0000-0002-6986-6756"

Gelfand, Joseph ;

• Search DOE PAGES for author "Gelfand, Joseph"
• Search DOE PAGES for ORCID "0000-0003-4679-1058"

Kerr, Matthew ;

• Search DOE PAGES for author "Kerr, Matthew"
• Search DOE PAGES for ORCID "0000-0002-0893-4073"

Ajello, Marco

• Search DOE PAGES for author "Ajello, Marco"
• Search DOE PAGES for ORCID "0000-0002-6584-1703"

Publication Date:

Wed Nov 30 00:00:00 EST 2022

Sponsoring Org.:

USDOE

OSTI Identifier:

1901422

Grant/Contract Number:  

AC02-76SF00515

Resource Type:

Published Article

Journal Name:

The Astrophysical Journal

Additional Journal Information:

Journal Name: The Astrophysical Journal Journal Volume: 940 Journal Issue: 2; Journal ID: ISSN 0004-637X

Publisher:

American Astronomical Society

Country of Publication:

United States

Language:

English