Discovery of Two New Pulsars in 47 Tucanae (NGC 104)

Abstract

We report the discovery of two new millisecond pulsars (PSRs J0024$-$7204aa and J0024$-$7204ab) in the globular cluster 47\,Tucanae (NGC 104). Our results bring the total number of pulsars in 47\,Tucanae to 25. These pulsars were discovered by reprocessing archival observations from the Parkes radio telescope. We reprocessed the data using a standard search procedure based on the PRESTO software package as well as using a new method in which we incoherently added the power spectra corresponding to $\sim$1100\,hr of observations. The newly discovered PSR~J0024$-$7204aa, has a pulse frequency of $\sim$541\,Hz (corresponding to a $\sim$1.84 ms period), which is higher than any other pulsars currently known in the cluster and ranks 12${}^{\mathrm{th}}$ amongst all the currently known pulsars. The dispersion measure of this pulsar, 24.941(7)\,cm${}^{-3}$ pc, is the highest in the cluster. The second discovered pulsar, PSR~J0024$-$7204ab, is an isolated pulsar with a pulse frequency of $\sim$270\,Hz (corresponding to a period of $\sim$3.70 ms).

arXiv comment5 pages, 1 table, 5 figures, accepted by MNRAS letter

References in corpus (12)

• The ATNF Pulsar Catalogue
• The ATNF Pulsar Catalogue
• A Radio Pulsar Spinning at 716 Hz
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• Fourier Techniques for Very Long Astrophysical Time Series Analysis
• Twenty-One Millisecond Pulsars in Terzan 5 Using the Green Bank Telescope
• Observations of 20 millisecond pulsars in 47 Tucanae at 20 cm
• Detection of ionized gas in the globular cluster 47 Tucanae
• Timing the millisecond pulsars in 47 Tucanae
• The Parkes Observatory Pulsar Data Archive
• A Binary Millisecond Pulsar in Globular Cluster NGC6544
• Radio Pulsars in Terzan 5

Cited by in corpus (41)

• Observational evidence for intermediate-mass black holes
• An intermediate-mass black hole in the centre of the globular cluster 47 Tucanae
• A Multi-Mass Velocity Dispersion Model of 47 Tucanae Indicates No Evidence for an Intermediate Mass Black Hole
• Long-term observations of the pulsars in 47 Tucanae - II. Proper motions, accelerations and jerks
• Using long-term millisecond pulsar timing to obtain physical characteristics of the bulge globular cluster Terzan 5
• The ultracompact nature of the black hole candidate X-ray binary 47 Tuc X9
• Eight new millisecond pulsars from the first MeerKAT globular cluster census
• FAST Globular Cluster Pulsar Survey: Twenty-Four Pulsars Discovered in Fifteen Globular Clusters
• Long-term observations of the pulsars in 47 Tucanae. I. A study of four elusive binary systems
• An algorithm for determining the rotation count of pulsars
• Discovery of three new millisecond pulsars in Terzan 5
• New Cataclysmic Variables and other Exotic Binaries in the Globular Cluster 47 Tucanae
• 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
• Population syntheses of millisecond pulsars from the Galactic Disk and Bulge
• Discovery of Millisecond Pulsars in the Globular Cluster Omega Centauri
• R-modes and neutron star recycling scenario
• NuSTAR Hard X-ray Observations of the Energetic Millisecond Pulsars PSR B1821-24, PSR B1937+21, and PSR J0218+4232
• A Deep Chandra X-ray Observatory Study of the Millisecond Pulsar Population in the Globular Cluster Terzan 5
• Searching for pulsars in the Galactic Centre at 3 and 2 mm
• Spin dynamics of a millisecond pulsar orbiting closely around a massive black hole
• Constraints from globular cluster pulsars on the magnetic field in the Galactic halo
• Three Pulsars Discovered by FAST in the Globular Cluster NGC 6517 with a Pulsar Candidate Sifting Code Based on Dispersion Measure to Signal-to-Noise Ratio Plots
• Two New Black Widow Millisecond Pulsars In M28
• Gravitomagnetism and Pulsar Beam Precession near a Kerr Black Hole
• Parkes transient events: I. Database of single pulses, initial results and missing FRBs
• Orbital spin dynamics of a millisecond pulsar around a massive black hole with an general mass quadrupole
• The FAST Globular Cluster Pulsar Survey (GC FANS)
• Applying saliency-map analysis in searches for pulsars and fast radio bursts
• A MeerKAT look at the polarization of 47 Tucanae pulsars: magnetic field implications
• Identifying the brightest Galactic globular clusters for future observations by H.E.S.S. and CTA
• A new pulsar candidate in 47 Tucanae discovered with MeerKAT imaging
• On the vanishing orbital X-ray variability of the eclipsing binary millisecond pulsar 47 Tuc W
• Wide Bandwidth Observations of Pulsars C, D and J in 47 Tucanae
• Gravitational Burst Radiation from Pulsars in the Galactic centre and stellar clusters
• Mining the time axis with TRON. I. Millisecond pulsars in Omega Centauri, Terzan 5 and 47 Tucanae detected through MeerKAT interferometric imaging
• Long-term observations of pulsars in the globular clusters 47 Tucanae and M15
• The FAST Discovery of a Millisecond Pulsar M15O (PSR J2129+1210O) Hidden in the Harmonics of M15A (PSR J2129+1210A)
• Illuminating Hidden Pulsars: Scintillation-Enhanced Discovery of Two Binary Millisecond Pulsars in M13 with FAST
• Search for Periodic Radio Signals from Double Neutron Star System Companions Using the Fast Folding Algorithm
• Spatial Modulation Search Applied to the Search and Confirmation of Highly Scintillated Pulsars at FAST with A Pulsar Discovered in M3