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Transitional millisecond pulsars (tMSPs) represent a crucial link between the rotation-powered and accretion-powered states of binary pulsars. During their active X-ray state, tMSPs are the only low-mass X-ray binary systems detected up to…

High Energy Astrophysical Phenomena · Physics 2025-03-19 A. Manca , F. Coti Zelati , J. Li , D. F. Torres , J. Ballet , A. Marino , A. Sanna , N. Rea , T. Di Salvo , A. Riggio , L. Burderi , R. Iaria

We discovered four millisecond pulsars (MSPs) in searches of 80 $\gamma$-ray sources conducted from 2015 to 2017 with the Murriyang radio telescope of the Parkes Observatory. We provide an overview of the survey and focus on the results of…

A year after \emph{Fermi} was launched, the number of known gamma-ray pulsars has increased dramatically. For the first time, a sizable population of pulsars has been discovered in gamma-ray data alone. For the first time, millisecond…

High Energy Astrophysical Phenomena · Physics 2009-12-21 L. Guillemot , Fermi LAT Collaboration

Millisecond Pulsars are second most abundant source population discovered by the Fermi-LAT. They might contribute non-negligibly to the diffuse emission measured at high latitudes by Fermi-LAT, the IDGRB. Gamma-ray sources also contribute…

High Energy Astrophysical Phenomena · Physics 2014-11-05 F. Calore , M. Di Mauro , F. Donato

In a radio search with the Green Bank Telescope of three unidentified low Galactic latitude Fermi-LAT sources, we have discovered the middle-aged pulsar J2030+3641, associated with 1FGL J2030.0+3641 (2FGL J2030.0+3640). Following the…

The Fermi Large Area Telescope (LAT) has revealed a mysterious extended excess of GeV gamma-ray emission around the Galactic Center, which can potentially be explained by unresolved emission from a population of pulsars, particularly…

We analyzed the globular cluster M5 (NGC 5904) using 15 years of gamma-ray data from the Fermi Large Area Telescope (LAT). Using rotation ephemerides generated from Arecibo and FAST radio telescope observations, we searched for gamma-ray…

High Energy Astrophysical Phenomena · Physics 2024-03-26 X. Hou , W. Zhang , P. C. C. Freire , D. F. Torres , J. Ballet , D. A. Smith , T. J. Johnson , M. Kerr , C. C. Cheung , L. Guillemot , J. Li , L. Zhang , A. Ridolfi , P. Wang , D. Li , J. Yuan , N. Wang

The $Fermi$-LAT has revealed that rotation powered millisecond pulsars (MSPs) are a major contributor to the Galactic $\gamma$-ray source population. We discuss the $\gamma$-ray emission process within the context of the outer gap…

High Energy Astrophysical Phenomena · Physics 2011-10-26 J. Takata , Y. Wang , K. S. Cheng

Globular clusters with their large populations of millisecond pulsars (MSPs) are believed to be potential emitters of high-energy gamma-ray emission. Our goal is to constrain the millisecond pulsar populations in globular clusters from…

Astrophysics of Galaxies · Physics 2015-05-18 The Fermi LAT collaboration

We report the discovery of two millisecond pulsars in a search for radio pulsations at the positions of \emph{Fermi Large Area Telescope} sources with no previously known counterparts, using the Nan\c{c}ay radio telescope. The two…

We report our search for \gamma-ray emission in the energy range from 100 MeV to 300 GeV from four Accreting Millisecond Pulsars (AMPs), SAX J1808.4-3658, IGR J00291+5934, XTE J1814-338, and XTE J0929-314. The data are from four-year…

High Energy Astrophysical Phenomena · Physics 2015-06-12 Yi Xing , Zhongxiang Wang

The gamma-ray population of millisecond pulsars (MSPs) detected by the Fermi Large Area Telescope (LAT) has been steadily increasing. A number of the more recent detections, including PSR J0034-0534, PSR J1939+2134 (B1937+21; the first MSP…

High Energy Astrophysical Phenomena · Physics 2011-11-08 C. Venter , T. J. Johnson , A. K. Harding

We have searched 92 unidentified sources from the FIRST and NVSS 1400 MHz radio survey catalogs for radio pulsations at 610 MHz. The selected radio sources are bright, have no identification with extragalactic objects, are point-like and…

Astrophysics · Physics 2008-11-26 Fronefield Crawford , Victoria M. Kaspi , Jon F. Bell

Over 2000 Gamma ray sources identified by the Large Area Telescope (LAT) on NASA's Fermi Gamma-ray Space Telescope are considered unassociated, meaning that they have no known counterparts in any other frequency regime. We have carried out…

An interesting new high-energy pulsar sub-population is emerging following early discoveries of gamma-ray millisecond pulsars (MSPs) by the Fermi Large Area Telescope (LAT). We present results from 3D emission modeling, including the…

High Energy Astrophysical Phenomena · Physics 2014-11-20 C. Venter , A. K. Harding , L. Guillemot

Millisecond pulsars (MSPs) are prolific GeV $\gamma\text{-ray}$ emitters, and nearly 80\% of Fermi-LAT MSPs reside in compact binaries. We demonstrate that the companions in these compact MSPs binaries are also 511 keV annihilation line…

High Energy Astrophysical Phenomena · Physics 2025-09-05 Zachary Metzler , Zorawar Wadiasingh

This paper details on the discovery of 21 pulsars using the Giant Metrewave Radio Telescope (GMRT) from targeted (Fermi directed search) and blind surveys (GMRT High Resolution Southern Sky - GHRSS) and results from the follow up studies.…

High Energy Astrophysical Phenomena · Physics 2018-08-22 Bhaswati Bhattacharyya

The dramatic increase in the number of known gamma-ray pulsars since the launch of the Fermi Gamma-ray Space Telescope (formerly GLAST) offers the first opportunity to study a population of these high-energy objects. This catalog summarizes…

High Energy Astrophysical Phenomena · Physics 2019-08-13 A. A. Abdo

At high-energy gamma-rays (>100 MeV) the Large Area Telescope (LAT) on the Fermi satellite already detected more than 145 rotation-powered pulsars (RPPs), while the number of pulsars seen at soft gamma-rays (20 keV - 30 MeV) remained small.…

High Energy Astrophysical Phenomena · Physics 2015-06-24 L. Kuiper , W. Hermsen

Excess of gamma rays around the Galactic center (GC) observed in the Fermi Large Area Telescope (LAT) data is one of the most intriguing features in the gamma-ray sky. The spherical morphology and the spectral energy distribution with a…

High Energy Astrophysical Phenomena · Physics 2025-03-13 Dmitry V. Malyshev