Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5

Padmanabh, P. V.; Ransom, S. M.; Freire, P. C. C.; Ridolfi, A.; Taylor, J. D.; Choza, C.; Clark, C. J.; Abbate, F.; Bailes, M.; Barr, E. D.; Buchner, S.; Burgay, M.; DeCesar, M. E.; Chen, W.; Corongiu, A.; Champion, D. J.; Dutta, A.; Geyer, M.; Hessels, J. W. T.; Kramer, M.; Possenti, A.; Stairs, I. H.; Stappers, B. W.; Venkatraman Krishnan, V.; Vleeschower, L.; Zhang, L.

doi:10.1051/0004-6361/202449303

A&A

2024

DOI: 10.1051/0004-6361/202449303

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Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5

P. V. Padmanabh,

S. M. Ransom,

P. C. C. Freire

et al.

Abstract: We report the discovery of ten new pulsars in the globular cluster Terzan 5 as part of the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project. We observed Terzan 5 at L-band (856--1712 MHz) with the MeerKAT radio telescope for four hours on two epochs, and performed acceleration searches of 45 out of 288 tied-array beams covering the core of the cluster. We obtained phase-connected timing solutions for nine discoveries, covering nearly two decades of archival observations from the Green Bank Te… Show more

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Cited by 3 publications

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Improved treatment of bosonic dark matter dynamics in neutron stars: consequences and constraints

Dutta,

Ghosh,

Mukhopadhyaya

2024

J. Cosmol. Astropart. Phys.

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It is conceivable that a bosonic dark matter (DM) with non-gravitational interactions with SM particles will be accumulated at the center of a neutron star (NS) and can lead to black hole formation. In contrast to previous works with a fixed NS temperature, we dynamically determine the formation of Bose-Einstein condensate (BEC) for a given set of DM parameters, namely the DM-neutron scattering cross-section (σχn), the thermal average of DM annihilation cross-section (⟨σv⟩) and the DM mass (mχ). For both non-annihilating and annihilating DM with ⟨σv⟩ ≲ 10-26 cm3 s-1, the BEC forms for mχ ≲ 10 TeV. In case of non-annihilating DM, observations of old NS allows σχn ≲ 10-52 cm2 for 10 MeV ≤ mχ ≲ 10 GeV (with BEC) and σχn ≲ 10-47 cm2 for 5 TeV ≲ mχ ≲ 30 PeV (without BEC). This analysis shows that the electroweak mass window, 10 GeV ≲ mχ ≲ 5 TeV is essentially unconstrained by NS observations and therefore is subject only to direct detection experiments. In the annihilating DM scenario, the exclusion limits on DM parameters become weaker and even vanish for typical WIMP annihilation cross-section. However, the late-time heating of the NS enables us to probe the region with σχn ≳ 10-47 cm2, using the James Webb Space Telescope in the foreseeable future. When our results are viewed in the context of indirect searches of DM, it provides a lower limit on the ⟨σv⟩, which is sensitive to the DM thermal state.

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Improved treatment of bosonic dark matter dynamics in neutron stars: consequences and constraints

Dutta,

Ghosh,

Mukhopadhyaya

2024

J. Cosmol. Astropart. Phys.

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Probing Populations of Dark Stellar Remnants in the Globular Clusters 47 Tuc and Terzan 5 Using Pulsar Timing

Smith,

Hénault-Brunet,

Dickson

et al. 2024

ApJ

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We present a new method to combine multimass equilibrium dynamical models and pulsar timing data to constrain the mass distribution and remnant populations of Milky Way globular clusters (GCs). We first apply this method to 47 Tuc, a cluster for which there exists an abundance of stellar kinematic data and which is also host to a large population of millisecond pulsars. We demonstrate that the pulsar timing data allow us to place strong constraints on the overall mass distribution and remnant populations even without fitting on stellar kinematics. Our models favor a small population of stellar-mass black holes (BHs) in this cluster (with a total mass of 446 − 72 + 75 M ⊙ ), arguing against the need for a large (>2000 M ⊙) central intermediate-mass BH. We then apply the method to Terzan 5, a heavily obscured bulge cluster that hosts the largest population of millisecond pulsars of any Milky Way GC and for which the collection of conventional stellar kinematic data is very limited. We improve existing constraints on the mass distribution and structural parameters of this cluster and place stringent constraints on its black hole content, finding an upper limit on the mass in BHs of ∼4000 M ⊙. This method allows us to probe the central dynamics of GCs even in the absence of stellar kinematic data and can be easily applied to other GCs with pulsar timing data, for which data sets will continue to grow with the next generation of radio telescopes.

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Discovery of a Millisecond Pulsar Associated with Terzan 6

Gao,

Shao,

Wang

et al. 2024

ApJL

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Observations show that globular clusters (GCs) might be among the best places to find millisecond pulsars (MSPs). However, the GC Terzan 6 seems to be an exception without any pulsar discovered, although its high stellar encounter rate suggests that it harbors dozens of them. We report the discovery of the first radio pulsar, PSR J1750–3116A, likely associated with Terzan 6 in a search of C-band (4–8 GHz) data from the Robert C. Byrd Green Bank Telescope with a spin period of 5.33 ms and dispersion measure (DM) ≃ 383 pc cm−3. The mean flux density of this pulsar is approximately 3 μJy. The DM agrees well with predictions from the Galactic free electron density model, assuming a distance of 6.7 kpc for Terzan 6. PSR J1750–3116A is likely an isolated MSP, potentially formed through dynamical interactions, considering the core-collapsed classification and the exceptionally high stellar encounter rate of Terzan 6. This is the highest radio frequency observation that has led to the discovery of a pulsar in a GC to date. While L-band (1–2 GHz) observations of this cluster are unlikely to yield significant returns due to propagation effects, we predict that further pulsar discoveries in Terzan 6 will be made by existing radio telescopes at higher frequencies.

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Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5

Cited by 3 publications

References 88 publications

Improved treatment of bosonic dark matter dynamics in neutron stars: consequences and constraints

Improved treatment of bosonic dark matter dynamics in neutron stars: consequences and constraints

Probing Populations of Dark Stellar Remnants in the Globular Clusters 47 Tuc and Terzan 5 Using Pulsar Timing

Discovery of a Millisecond Pulsar Associated with Terzan 6

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