Parkes radio and NuSTAR X-ray observations of the composite supernova remnant B0453-685 in the large magellanic cloud

Jordan Eagle, Jeremy Hare, Elizabeth Hays, Daniel Castro, Joseph Gelfand, Jwaher Alnaqbi, Matthew Kerr, Shi Dai, Jean Ballet, Fabio Acero, Patrick Slane, Marco Ajello

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Abstract

Gamma-ray emission is observed coincident in position to the evolved, composite supernova remnant (SNR) B0453-685. Prior multiwavelength investigations of the region indicate that the pulsar wind nebula (PWN) within the SNR is the most likely origin for the observed gamma rays, with a possible pulsar contribution that becomes significant at energies below E ∼ 5 GeV. Constraints on the PWN hard X-ray spectrum are important for the most accurate broadband representation of PWN emission and determining the presence of a gamma-ray pulsar component. The results of Parkes radio and Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray observations are presented on PWN B0453-685. We perform a search for the central pulsar in the new Parkes radio data, finding an upper limit of 12 μJy. A pulsation search in the new NuSTAR observations additionally provides a 3σ upper limit on the hard X-ray pulsed fraction of 56%. The PWN is best characterized with a photon index ΓX = 1.91 ± 0.20 in the 3-78 keV NuSTAR data, and the results are incorporated into existing broadband models. Last, we characterize a serendipitous source detected by Chandra and NuSTAR that is considered a new high-mass X-ray binary candidate.

Original languageEnglish
Article number247
Number of pages9
JournalAstrophysical Journal
Volume975
Issue number2
DOIs
Publication statusPublished - 2024

Keywords

  • High mass x-ray binary stars (733)
  • Large Magellanic Cloud (903)
  • Optical astronomy (1776)
  • Pulsar wind nebulae (2215)
  • Pulsars (1306)
  • Radio astronomy (1338)
  • X-ray astronomy (1810)

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