Timing of Pulsars in the Globular Cluster Omega Centauri

Abstract

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 $-18\pm 8$ rad m${}^{-2}$.

arXiv comment8 pages, 5 figures, MNRAS accepted

References in corpus (45)

• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• TEMPO2, a new pulsar timing package. I: Overview
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• DSPSR: Digital Signal Processing Software for Pulsar Astronomy
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• A catalogue of masses, structural parameters and velocity dispersion profiles of 112 Milky Way globular clusters
• Fourier Techniques for Very Long Astrophysical Time Series Analysis
• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• An ultra-wide bandwidth (704 to 4032 MHz) receiver for the Parkes radio telescope
• Modeling Dense Star Clusters in the Milky Way and Beyond with the $\text{CMC}$ Cluster Catalog
• An intermediate-mass black hole in the centre of the globular cluster 47 Tucanae
• Pass 8: Toward the Full Realization of the Fermi-LAT Scientific Potential
• A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope
• A Study of Multi-frequency Polarization Pulse Profiles of Millisecond Pulsars
• The Unique History of the Globular Cluster Omega Centauri
• Improving Sensitivity to Weak Pulsations with Photon Probability Weighting
• Long-term observations of the pulsars in 47 Tucanae - II. Proper motions, accelerations and jerks
• The Parallax of Omega Centauri Measured from Gaia EDR3 and a Direct, Geometric Calibration of the Tip of the Red Giant Branch and the Hubble Constant
• Stellar Encounter Rate in Galactic Globular Clusters
• On the disruption of pulsar and X-ray binaries in globular clusters
• Timing the millisecond pulsars in 47 Tucanae
• Using long-term millisecond pulsar timing to obtain physical characteristics of the bulge globular cluster Terzan 5
• Millisecond Pulsars and Black Holes in Globular Clusters
• The effect of stellar-mass black holes on the central kinematics of omega Cen: a cautionary tale for IMBH interpretations
• Evidence for an intermediate-mass black hole in the globular cluster NGC 6624
• No evidence for intermediate-mass black holes in the globular clusters $\omega$ Cen and NGC 6624
• The Multipolar Magnetic Field of Millisecond Pulsar PSR J0030+0451
• Long-term observations of the pulsars in 47 Tucanae. I. A study of four elusive binary systems
• Dynamical Formation of Millisecond Pulsars in Globular Clusters
• Wideband polarized radio emission from the newly revived magnetar XTE J1810$-$197
• Internal gas models and central black hole in 47 Tucanae using millisecond pulsars
• Chandra studies of the globular cluster 47 Tucanae: A deeper X-ray source catalogue, five new X-ray counterparts to millisecond radio pulsars, and new constraints to r-mode instability window
• A Deep X-ray Survey of the Globular Cluster Omega Centauri
• A Census of X-ray Millisecond Pulsars in Globular Clusters
• Compact Object Modeling in the Globular Cluster 47 Tucanae
• Discovery of Millisecond Pulsars in the Globular Cluster Omega Centauri
• Evidence for a high-energy tail in the gamma-ray spectra of globular clusters
• Dark and luminous mass components of Omega Centauri with stellar kinematics
• MeerKAT discovery of 13 new pulsars in Omega Centauri
• The Galactic bulge millisecond pulsars shining in X rays: A gamma-ray perspective
• On the origin of the gamma-ray emission from Omega Centauri: Milisecond pulsars and dark matter annihilation
• Constraints on annihilating dark matter in the Omega Centauri cluster
• A Search for Annihilating Dark Matter in 47 Tucanae and Omega Centauri

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• Characterizing the Gamma-ray Emission Properties of the Globular Cluster M5 with the Fermi-LAT
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