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We report the discovery of PSR~J2251$-$3711, a radio pulsar with a spin period of 12.1 seconds, the second longest currently known. Its timing parameters imply a characteristic age of 15 Myr, a surface magnetic field of $1.3 \times…

A solitary millisecond pulsar, if near the mass limit, and undergoing a phase transition, either first or second order, provided the transition is to a substantially more compressible phase, will emit a blatantly obvious…

Astrophysics · Physics 2009-10-30 Norman K. Glendenning

Globular clusters harbor numerous millisecond pulsars, but long-period pulsars ($P \gtrsim 100$ ms) are rarely found. In this study, we employed a fast folding algorithm to analyze observational data from multiple globular clusters obtained…

We report on observations of the sixth accretion-powered millisecond pulsar, IGR J00291+5934, with the Rossi X-Ray Timing Explorer. The source is a faint, recurrent X-ray transient initially identified by INTEGRAL. The 599 Hz (1.67 ms)…

Astrophysics · Physics 2009-11-10 D. K. Galloway , C. B. Markwardt , E. H. Morgan , D. Chakrabarty , T. E. Strohmayer

We report on the discovery of gamma-ray pulsations from five millisecond pulsars (MSPs) using the Fermi Large Area Telescope (LAT) and timing ephemerides provided by various radio observatories. We also present confirmation of the gamma-ray…

Millisecond radio pulsars are neutron stars that have been spun-up by the transfer of angular momentum during the low-mass X-ray binary phase. The transition from an accretion-powered to a rotation-powered pulsar takes place on evolutionary…

Astrophysics · Physics 2009-11-10 S. Campana , P. D'Avanzo , J. Casares , S. Covino , G. L. Israel , G. Marconi , Rob Hynes , P. Charles , L. Stella

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 report on the discovery of PSR J1141-6545, a radio pulsar in an eccentric, relativistic 5-hr binary orbit. The pulsar shows no evidence for being recycled, having pulse period P = 394 ms, characteristic age tau_c = 1.4 x 10^6 yr, and…

Millisecond pulsars (MSPs) are generally agreed to originate in low-mass X-ray binaries (LMXBs), in which mass transfer onto the neutron stars spins them up to their observed, fast rotation. The lack of MSPs and LMXBs rotating near break-up…

Astrophysics · Physics 2009-11-07 Andreas Reisenegger , Axel Bonacic

PSR J1306--40 is a millisecond pulsar binary with a non-degenerate companion in an unusually long $\sim$1.097 day orbit. We present new optical photometry and spectroscopy of this system, and model these data to constrain fundamental…

High Energy Astrophysical Phenomena · Physics 2019-05-01 Samuel J. Swihart , Jay Strader , Laura Chomiuk , Laura Shishkovsky

We review the main properties, demographics and applications of binary and millisecond radio pulsars. Our knowledge of these exciting objects has greatly increased in recent years, mainly due to successful surveys which have brought the…

Astrophysics · Physics 2016-10-19 D. R. Lorimer

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…

High Energy Astrophysical Phenomena · Physics 2023-03-29 S. Dai , S. Johnston , M. Kerr , J. Berteaud , B. Bhattacharyya , F. Camilo , E. Keane

We searched for radio pulsars in 25 of the non-variable, unassociated sources in the Fermi LAT Bright Source List with the Green Bank Telescope at 820 MHz. We report the discovery of three radio and gamma-ray millisecond pulsars (MSPs) from…

We present timing observations of four millisecond pulsars discovered in the Parkes 20-cm multibeam pulsar survey of the Galactic plane. PSRs J1552-4937 and J1843-1448 are isolated objects with spin periods of 6.28 and 5.47 ms respectively.…

We investigate the spin-period evolutions of recycled pulsars in binary accreting systems. Taking both the accretion induced field decay and spin-up into consideration, we calculate their spin-period evolutions influenced by the initial…

High Energy Astrophysical Phenomena · Physics 2015-05-20 J. Wang , C. M. Zhang , Y. H. Zhao , Y. Kojima , H. X. Yin , L. M. SOng

Millisecond pulsars (MSPs) are the oldest but fastest pulsars known to date. In the 1980s, to explain how these pulsars could be formed, a new hypothesis was formulated: the recycling of pulsars, i.e the fact that a pulsar could accrete…

High Energy Astrophysical Phenomena · Physics 2026-03-16 Mattéo Sautron , Jérôme Pétri , Dipanjan Mitra , Adélie Dupuy--Junet , Marie-Eloïse Pietrin

Globular clusters produce orders of magnitude more millisecond pulsars per unit mass than the Galactic disk. Since the first cluster pulsar was uncovered twenty years ago, at least 138 have been identified - most of which are binary…

Astrophysics · Physics 2008-11-26 Scott M. Ransom

We conducted a sensitive acceleration search using Fast Fourier Transform (FFT) techniques on full-length and segmented data from 84 observations of the globular cluster M13 with the Five-hundred-meter Aperture Spherical radio Telescope…

High Energy Astrophysical Phenomena · Physics 2025-10-15 Dejiang Yin , Lin Wang , Li-yun Zhang , Lei Qian , Baoda Li , Kuo Liu , Bo Peng , Yinfeng Dai , Yaowei Li , Zhichen Pan

NGC 6316 is a poorly studied, distant, and massive globular cluster (GC) with prominent gamma-ray emission detected via the \textit{Fermi} Large Area Telescope (LAT). Based on gamma-ray spectral studies, NGC 6316 is expected to host tens of…

High Energy Astrophysical Phenomena · Physics 2026-03-09 Deven Bhakta , Scott M. Ransom , Megan DeCesar , Shi Dai

We report the discovery of the first millisecond pulsar with a pulsating white dwarf companion. Following the recent discoveries of pulsations in extremely low-mass (ELM, <0.3 Msol) white dwarfs (WDs), we targeted ELM WD companions to two…

Solar and Stellar Astrophysics · Physics 2015-06-23 Mukremin Kilic , J. J. Hermes , A. Gianninas , Warren R. Brown