JOURNAL ARTICLE

Examining a hadronic γ-ray scenario for the radiative shell and molecular clouds of the old GeV supernova remnant G298.6−0.0.

  • Published In: Publications of the Astronomical Society of Japan, 2024, v. 76, n. 3. P. 490 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Yeung, Paul K H; Lee, Shiu-Hang; Mizuno, Tsunefumi; Bamba, Aya 3 of 3

Abstract

This article focuses on the refined analysis of γ-ray emissions associated with the supernova remnant (SNR) G298.6−0.0 using 13.7 years of Fermi Large Area Telescope (Fermi-LAT) data. The study confirms two γ-ray sources, Src-NE and Src-NW, exhibiting spectral breaks at approximately 1.5 GeV and 0.7 GeV, respectively, and interprets Src-NE as dominated by the SNR shell emission while Src-NW arises mainly from farther molecular clouds (MCs) bombarded by cosmic rays that escaped the SNR. Cosmic-ray spectral modeling supports a hadronic origin for these emissions, with Src-NW requiring a higher minimum cosmic-ray energy and energy density consistent with delayed cosmic-ray diffusion into MCs. By comparing these features with analogous SNRs such as W 28 and W 44, the authors constrain the age of SNR G298.6−0.0 to be between 10 and 30 thousand years under a purely hadronic scenario.

Additional Information

  • Source:Publications of the Astronomical Society of Japan. 2024/06, Vol. 76, Issue 3, p490
  • Document Type:Article
  • Subject Area:Astronomy and Astrophysics
  • Publication Date:2024
  • ISSN:0004-6264
  • DOI:10.1093/pasj/psae025
  • Accession Number:177947902
  • Copyright Statement:Copyright of Publications of the Astronomical Society of Japan is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Looking to go deeper into this topic? Look for more articles on EBSCOhost.