The MAVERIC Survey: New compact binaries revealed by deep radio continuum observations of the Galactic globular cluster Terzan 5 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astrophys.J. Année : 2020

The MAVERIC Survey: New compact binaries revealed by deep radio continuum observations of the Galactic globular cluster Terzan 5

Ryan Urquhart
  • Fonction : Auteur
Arash Bahramian
  • Fonction : Auteur
Jay Strader
Laura Chomiuk
  • Fonction : Auteur
Scott M. Ransom
  • Fonction : Auteur
Yuankun Wang
  • Fonction : Auteur
Craig O. Heinke
  • Fonction : Auteur
Vlad Tudor
  • Fonction : Auteur
James C.A. Miller-Jones
  • Fonction : Auteur
Alexandra J. Tetarenko
  • Fonction : Auteur
Thomas J. Maccarone
  • Fonction : Auteur
Gregory R. Sivakoff
  • Fonction : Auteur
Laura Shishkovsky
  • Fonction : Auteur
Samuel J. Swihart
  • Fonction : Auteur

Résumé

Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars (MSPs) known among Galactic globular clusters. Here we report new deep 2–8 GHz radio continuum observations of Terzan 5 obtained with the Karl G. Jansky Very Large Array. We have identified a total of 24 sources within the cluster half-light radius, including 17 within the core radius. Nineteen are associated with previously studied MSPs and X-ray binaries. Three of the new radio sources have steep radio spectra and are located within the cluster core, as expected for MSPs. These three sources have hard X-ray photon indices (Γ = 1.3–1.5) and highly variable X-ray emission, suggesting they are binary MSPs belonging to the spider class. For the most X-ray luminous of these sources, the redback spider classification is confirmed by its X-ray light curve, which shows an orbital period of 12.32 hr and double-peaked structure around X-ray maximum. The likely discovery of bright binary MSPs in a well-studied cluster like Terzan 5 highlights how deep radio continuum imaging can complement pulsar search and timing observations in finding probable eclipsing systems. The other new radio source in the core has a flat radio spectrum and is X-ray faint ( erg s−1) with a photon index Γ = 2.1 ± 0.5, consistent with the properties expected for a quiescent stellar-mass black hole X-ray binary.

Dates et versions

hal-02959549 , version 1 (06-10-2020)

Identifiants

Citer

Ryan Urquhart, Arash Bahramian, Jay Strader, Laura Chomiuk, Scott M. Ransom, et al.. The MAVERIC Survey: New compact binaries revealed by deep radio continuum observations of the Galactic globular cluster Terzan 5. Astrophys.J., 2020, 904 (2), pp.147. ⟨10.3847/1538-4357/abb6fc⟩. ⟨hal-02959549⟩
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