The Astrophysical Journal Letters (Jan 2023)

HAWC Detection of a TeV Halo Candidate Surrounding a Radio-quiet Pulsar

  • A. Albert,
  • R. Alfaro,
  • J. C. Arteaga-Velázquez,
  • H. A. Ayala Solares,
  • E. Belmont-Moreno,
  • T. Capistrán,
  • A. Carramiñana,
  • S. Casanova,
  • J. Cotzomi,
  • S. Coutiño De León,
  • E. De la Fuente,
  • C. de León,
  • R. Diaz Hernandez,
  • M. A. DuVernois,
  • J. C. Díaz-Vélez,
  • C. Espinoza,
  • K. L. Fan,
  • N. Fraija,
  • K. Fang,
  • J. A. García-González,
  • F. Garfias,
  • A. Jardin-Blicq,
  • M. M. González,
  • J. A. Goodman,
  • J. P. Harding,
  • S. Hernandez,
  • D. Huang,
  • F. Hueyotl-Zahuantitla,
  • P. Hüntemeyer,
  • A. Iriarte,
  • V. Joshi,
  • A. Lara,
  • J. Lee,
  • H. León Vargas,
  • J. T. Linnemann,
  • A. L. Longinotti,
  • G. Luis-Raya,
  • K. Malone,
  • O. Martinez,
  • J. Martínez-Castro,
  • J. A. Matthews,
  • J. A. Morales-Soto,
  • E. Moreno,
  • M. Mostafá,
  • A. Nayerhoda,
  • L. Nellen,
  • M. Newbold,
  • M. U. Nisa,
  • Y. Pérez Araujo,
  • Y. Son,
  • E. G. Pérez-Pérez,
  • C. D. Rho,
  • D. Rosa-González,
  • A. Sandoval,
  • M. Schneider,
  • J. Serna-Franco,
  • A. J. Smith,
  • R. W. Springer,
  • K. Tollefson,
  • I. Torres,
  • R. Torres-Escobedo,
  • X. Wang,
  • K. Whitaker,
  • E. Willox,
  • H. Zhou,
  • THE HAWC COLLABORATION

DOI
https://doi.org/10.3847/2041-8213/acb5ee
Journal volume & issue
Vol. 944, no. 2
p. L29

Abstract

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Extended very-high-energy (VHE; 0.1–100 TeV) γ -ray emission has been observed around several middle-aged pulsars and referred to as “TeV halos.” Their formation mechanism remains under debate. It is also unknown whether they are ubiquitous or related to a certain subgroup of pulsars. With 2321 days of observation, the High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory detected VHE γ -ray emission at the location of the radio-quiet pulsar PSR J0359+5414 with >6 σ significance. By performing likelihood tests with different spectral and spatial models and comparing the TeV spectrum with multiwavelength observations of nearby sources, we show that this excess is consistent with a TeV halo associated with PSR J0359+5414, though future observation of HAWC and multiwavelength follow-ups are needed to confirm this nature. This new halo candidate is located in a noncrowded region in the outer galaxy. It shares similar properties to the other halos but its pulsar is younger and radio-quiet. Our observation implies that TeV halos could commonly exist around pulsars and their formation does not depend on the configuration of the pulsar magnetosphere.

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