Timing of Pulsars in the Globular Cluster Omega Centauri - Archive ouverte HAL
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2023

Timing of Pulsars in the Globular Cluster Omega Centauri

S Dai
  • Fonction : Auteur
S Johnston
  • Fonction : Auteur
M Kerr
  • Fonction : Auteur
B Bhattacharyya
  • Fonction : Auteur
F Camilo
  • Fonction : Auteur
E Keane
  • Fonction : Auteur

Résumé

We present the timing of the first five millisecond pulsars discovered in the globular cluster Omega Centauri and the discovery of a pulsar with a spin period of 3.68 ms. With a timing baseline of $\sim$3.5 yr we are able to measure the derivative of the spin frequency ($\dot{\nu}$) for the first five pulsars. Upper limits on the pulsar line-of-sight acceleration are estimated and compared with predictions based on analytical models of the cluster. We find that PSRs J1326$-$4728B and D show large negative accelerations, which are in tension with the minimum acceleration predicted by analytical models. We searched for pulsed $\gamma$-ray signals using 14.3 yr of data from the Fermi Large Area Telescope. Although we found no evidence for $\gamma$-ray pulsations, PSRs~J1326$-$4728A, B, C and E are associated with X-ray sources. This suggests that the observed $\gamma$-ray emission from Omega Centauri is likely caused by the emission of the ensemble of MSPs. Finally, the linearly polarised emission from PSR J1326$-$4728A yields a rotation measure of $-18\pm8$ rad m$^{-2}$.

Dates et versions

hal-04047658 , version 1 (27-03-2023)

Identifiants

Citer

S Dai, S Johnston, M Kerr, J Berteaud, B Bhattacharyya, et al.. Timing of Pulsars in the Globular Cluster Omega Centauri. Monthly Notices of the Royal Astronomical Society, 2023, 521 (2), pp.2616-2622. ⟨10.1093/mnras/stad704⟩. ⟨hal-04047658⟩
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