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The study of binary millisecond pulsars (MSPs) in globular clusters (GCs) is a key ingredient to study binary and stellar evolution under extreme conditions. In this context, an accurate analysis of the optical emission, which is mostly…

High Energy Astrophysical Phenomena · Physics 2026-01-14 Greta Ettorre , Emanuele Dalessandro , Mario Cadelano , Cristina Pallanca , Paulo C. C. Freire , Alessandro Ridolfi

The Fermi Large Area Telescope, in collaboration with several groups from the radio community, have had marvellous success at uncovering new gamma-ray millisecond pulsars (MSPs). In fact, MSPs now make up a sizable fraction of the total…

High Energy Astrophysical Phenomena · Physics 2015-05-19 C. Venter , A. K. Harding , T. J. Johnson

The timing follow-up of newly discovered millisecond pulsars (MSPs) is hindered by the larger positional uncertainty (a few tens of arc-minutes) associated with the discovery. In this paper, we present the localization of two MSPs,…

High Energy Astrophysical Phenomena · Physics 2023-02-28 Shyam Sunder , Jayanta Roy , Sanjay Kudale , Bhaswati Bhattacharyya , Arpit K. Behera , Shubham Singh

We present results from an emission code that assumes millisecond pulsars (MSPs) to be sources of relativistic particles in globular clusters (GCs) and models the resulting spectral energy distribution (SED) of Galactic GCs due to these…

High Energy Astrophysical Phenomena · Physics 2017-11-08 Hambeleleni Ndiyavala , Petrus Paulus Kruger , Christo Venter

A striking aspect of the radio profiles of many millisecond pulsars (MSPs) is that they consist of components separated from each other by regions lacking in emission. We devise a technique for determining "disjoint" from "contiguous"…

High Energy Astrophysical Phenomena · Physics 2025-12-18 Michael Kramer , Simon Johnston

We report results of one of the most sensitive pulsar surveys to date targeting the innermost region of the Galactic Center (GC) using the Robert C. Byrd Green Bank Telescope (GBT) at X-band (8--12GHz) using data from the Breakthrough…

Globular clusters host large populations of millisecond pulsars (MSPs) due to their high gravitational encounter rates, producing many binary systems and thus MSPs via the recycling process. Seven pulsars with spin periods ranging from 3 ms…

High Energy Astrophysical Phenomena · Physics 2024-12-17 Justine Singleton , Megan DeCesar , Shi Dai , Deven Bhakta , Scott Ransom , Jay Strader , Laura Chomiuk , James Miller-Jones

Among the current sample of over 2000 radio pulsars known primarily in the disk of our Galaxy, millisecond pulsars now number almost 200. Due to the phenomenal success of blind surveys of the Galactic field, and targeted searches of Fermi…

Astrophysics of Galaxies · Physics 2015-06-11 Duncan R. Lorimer

We report our analysis results for the globular cluster (GC) NGC~6341 (M92), as a millisecond pulsar (MSP) J1717$+$4308A has recently been reported found in this GC. The data used are from the Large Area Telescope onboard the {\it Fermi…

High Energy Astrophysical Phenomena · Physics 2023-03-15 P. Zhang , Y. Xing , Z. Wang , W. Wu , Z. Chen

Observations show that globular clusters might be among the best places to find millisecond pulsars. However, the globular cluster Terzan 6 seems to be an exception without any pulsar discovered, although its high stellar encounter rate…

High Energy Astrophysical Phenomena · Physics 2024-10-03 Shi-Jie Gao , Yi-Xuan Shao , Pei Wang , Ping Zhou , Xiang-Dong Li , Lei Zhang , Joseph W. Kania , Duncan R. Lorimer , Di Li

Although high-sensitivity surveys have revealed a number of highly dispersed pulsars in the inner Galaxy, none have so far been found in the Galactic centre (GC) region, which we define to be within a projected distance of 1~pc from Sgr~A*.…

High Energy Astrophysical Phenomena · Physics 2017-08-09 Kaustubh Rajwade , Duncan Lorimer , Loren Anderson

We have conducted a search of 19 southern Galactic globular clusters for sub-millisecond pulsars at 660 MHz with the Parkes 64-m radio telescope. To minimize dispersion smearing we used the CPSR baseband recorder, which samples the 20 MHz…

Astrophysics · Physics 2009-11-06 R. T. Edwards , W. van Straten , M. Bailes

This paper describes the new Globular Clusters GMRT Pulsar Search (GCGPS) survey. This survey aims to find MSPs in the globular clusters (GCs) of the Milky Way using uGMRT. The observations use the uGMRT's Band-4 (550$-$750 MHz) and Band-3…

Owing to its massive, dense core, Terzan 5 has the richest population of millisecond pulsars known among Galactic globular clusters. Here we report new deep $2-8\,$GHz radio continuum observations of Terzan\,5 obtained with the Karl G.…

Millisecond pulsars (MSPs) have been established as a class of high-energy ($\geq$0.1 GeV) emitters with the Large Area Telescope (LAT) aboard the \emph{Fermi Gamma-ray Space Telescope}. Most MSP gamma-ray light curves display sharp peaks…

High Energy Astrophysical Phenomena · Physics 2012-09-19 T. J. Johnson

Radio pulsar timing array (PTA) experiments using millisecond pulsars (MSPs) are beginning to detect nHz gravitational waves (GWs). MSPs are bright GeV gamma-ray emitters, and all-sky monitoring of about 100 MSPs with the Fermi Large Area…

High Energy Astrophysical Phenomena · Physics 2025-12-18 Matthew Kerr , Zorawar Wadiasingh , Adrien Laviron , Constantinos Kalapotharakos , Thankful Cromartie , Tyler Cohen

Pulsed emission from almost one hundred millisecond pulsars (MSPs) has been detected in $\gamma$-rays by the Fermi Large-Area Telescope. The global properties of this population remain relatively unconstrained despite many attempts to model…

High Energy Astrophysical Phenomena · Physics 2018-09-25 R. T. Bartels , T. D. P. Edwards , C. Weniger

Globular clusters (GCs) offer a unique environment for discovering and studying millisecond pulsars. In this paper, we present a multi-epoch search and detailed timing analysis of millisecond pulsars in the GC M2, using the…

We have been conducting deep searches at ~20 cm of >30 globular clusters (GCs) using the 305-m Arecibo telescope in Puerto Rico and the 100-m Green Bank telescope (GBT) in West Virginia. With roughly 80% of our search data analyzed, we have…

Astrophysics · Physics 2007-05-23 Scott Ransom , Jason Hessels , Ingrid Stairs , Victoria Kaspi , Paulo Freire , Donald Backer

We present the deepest and highest-resolution radio continuum imaging of the Galactic globular cluster Terzan 5, one of the most crowded locations in the radio sky. In these new 2$-$4 GHz Karl G. Jansky Very Large Array images, we detect 38…

High Energy Astrophysical Phenomena · Physics 2026-02-12 Ryan Urquhart , Jay Strader , Laura Chomiuk , Scott M. Ransom , Craig O. Heinke , Arash Bahramian , Thomas J. Maccarone