Article Dans Une Revue The Astrophysical Journal Année : 2021

Multiwavelength Evidence for a New Flare-mode Transitional Millisecond Pulsar

Jay Strader
Samuel J. Swihart
  • Fonction : Auteur
Ryan Urquhart
  • Fonction : Auteur
Laura Chomiuk
  • Fonction : Auteur
Elias Aydi
  • Fonction : Auteur
Arash Bahramian
  • Fonction : Auteur
Adam Kawash
  • Fonction : Auteur
Kirill V. Sokolovsky
  • Fonction : Auteur
Andrej Udalski
  • Fonction : Auteur

Résumé

We report the discovery of a new low-mass X-ray binary near the center of the unassociated Fermi GeV γ-ray source 4FGL J0540.0–7552. The source shows the persistent presence of an optical accretion disk and exhibits extreme X-ray and optical variability. It also has an X-ray spectrum well-fit by a hard power law with Γ = 1.8 and a high ratio of X-ray to γ-ray flux. Together, these properties are consistent with the classification of the binary as a transitional millisecond pulsar (tMSP) in the subluminous disk state. Uniquely among the candidate tMSPs, 4FGL J0540.0–7552 shows consistent optical, X-ray, and γ-ray evidence for having undergone a state change, becoming substantially brighter in the optical and X-rays and fainter in GeV γ-rays sometime in mid-2013. In its current subluminous disk state, and like one other candidate tMSP in the Galactic field, 4FGL J0540.0–7552 appears to always be in an X-ray “flare mode,” indicating that this could be common phenomenology for tMSPs.

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hal-03268944 , version 1 (02-08-2025)

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Jay Strader, Samuel J. Swihart, Ryan Urquhart, Laura Chomiuk, Elias Aydi, et al.. Multiwavelength Evidence for a New Flare-mode Transitional Millisecond Pulsar. The Astrophysical Journal, 2021, 917 (2), pp.69. ⟨10.3847/1538-4357/ac0b47⟩. ⟨hal-03268944⟩
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