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Related papers: Population study for gamma-ray pulsars: (III) Radi…

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It has been proposed that a large population of unresolved millisecond pulsars (MSPs) could potentially account for the excess of GeV-scale gamma-rays observed from the region surrounding the Galactic Center. The viability of this scenario…

High Energy Astrophysical Phenomena · Physics 2016-04-13 Dan Hooper , Gopolang Mohlabeng

We present results of a pulsar population synthesis study that incorporates a number of recent developments and some significant improvements over our previous study. We have included the results of the Parkes multi-beam pulsar survey in…

Astrophysics · Physics 2009-11-10 Peter L. Gonthier , Robert Van Guilder , Alice K. Harding

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

Fermi Large Area Telescope (LAT) has recently detected 8 gamma-ray millisecond pulsars (MSPs), providing an unprecedented opportunity to probe the magnetospheres of these low-spin-down pulsars. We performed 3D emission modeling, including…

High Energy Astrophysical Phenomena · Physics 2009-11-26 C. Venter , A. K. Harding , L. Guillemot

We modelled the radio and gamma-ray light curves of millisecond pulsars using outer gap, two-pole caustic, low-altitude slot gap, and pair-starved polar cap geometric models, combined with a semi-empirical conal radio model. We find that no…

High Energy Astrophysical Phenomena · Physics 2014-11-04 C Venter , TJ Johnson , AK Harding , JE Grove

Using archival as well as freshly acquired data, we assess the X-ray behaviour of the Fermi/LAT gamma-ray pulsars listed in the First Fermi source catalog. After revisiting the relationships between the pulsars' rotational energy losses and…

High Energy Astrophysical Phenomena · Physics 2015-05-27 Martino Marelli , Andrea De Luca , Patrizia A. Caraveo

The most energetic neutron stars, powered by their rotation, are capable of producing pulsed radiation from the radio up to gamma rays with nearly TeV energies. These pulsars are part of the universe of energetic and powerful particle…

High Energy Astrophysical Phenomena · Physics 2015-09-30 Isabelle A. Grenier , Alice K. Harding

This work presents a methodological approach to generate realistic $\gamma$-ray light curves of pulsars, resembling reasonably well the observational ones observed by the Fermi-Large Area Telescope instrument, fitting at the same time their…

High Energy Astrophysical Phenomena · Physics 2024-04-03 Daniel Íñiguez-Pascual , Diego F. Torres , Daniele Viganò

Observing simultaneously pulsed radio and gamma-ray emission from these stars helps to constrain the geometry and radiation mechanisms within their magnetosphere and to localize the multiple photon production sites. In this paper, we fit…

High Energy Astrophysical Phenomena · Physics 2021-10-20 J. Pétri , D. Mitra

Gamma-ray emission from pulsars is thought to arise from accelerating regions in pulsar's outer magnetosphere. The shape of the light curves is thus sensitive to the details of the magnetic geometry of the magnetosphere. In this work, we…

High Energy Astrophysical Phenomena · Physics 2009-11-03 Xue-Ning Bai , Anatoly Spitkovsky

The Large Area Telescope aboard the Fermi spacecraft has detected more than 200 $\gamma$-ray pulsars since its launch in 2008. By concurrently fitting standard geometric model light curves onto Fermi and radio data, researchers have…

High Energy Astrophysical Phenomena · Physics 2018-08-30 M. C. Bezuidenhout , C. Venter , A. S. Seyffert , A. K. Harding

We describe a comprehensive pulsar monitoring campaign for the Large Area Telescope (LAT) on the {\em Fermi Gamma-ray Space Telescope} (formerly GLAST). The detection and study of pulsars in gamma rays give insights into the populations of…

Pulsed emission from gamma-ray pulsars originates inside the magnetosphere, from radiation by charged particles accelerated near the magnetic poles or in the outer gaps. In polar cap models, the high energy spectrum is cut off by magnetic…

Astrophysics · Physics 2009-10-31 Alice K. Harding

The $Fermi$-LAT has revealed that rotation powered millisecond pulsars (MSPs) are a major contributor to the Galactic $\gamma$-ray source population. Such pulsars may also be important in modeling the quiescent state of several low mass…

High Energy Astrophysical Phenomena · Physics 2015-06-03 J. Takata , K. S. Cheng , R. E. Taam

Pulsars are among the prime targets for the Large Area Telescope (LAT) aboard the recently launched Fermi observatory. The LAT will study the gamma-ray Universe between 20 MeV and 300 GeV with unprecedented detail. Increasing numbers of…

There is a growing new class of young spin-down powered pulsars called GeV-quiet soft gamma-ray pulsar; (1) spectral turnover appears around~10MeV, (2) the X-ray spectra of below 20 keV can be described by power law with photon index around…

High Energy Astrophysical Phenomena · Physics 2015-06-22 Y. Wang , C. W. Ng , J. Takata , Gene C. K. Leung , K. S. Cheng

We report the detection of gamma-ray pulsations from the high-magnetic-field rotation-powered pulsar PSR J1119-6127 using data from the Fermi Large Area Telescope. The gamma-ray light curve of PSR J1119-6127 shows a single, wide peak offset…

The Fermi Large Area Telescope (LAT) has recently detected a population of globular clusters (GCs) in high-energy (HE) gamma-rays. Their spectral properties and energetics are consistent with cumulative emission from a population of…

High Energy Astrophysical Phenomena · Physics 2011-11-08 C. Venter , O. C. de Jager , A. Kopp , I. Büsching

We develop kinetic plasma models of pulsar magnetospheres with magnetic-field-line-dependent plasma injection that reveal the importance of various magnetosphere regions in regulating the gamma-ray emission. We set different particle…

High Energy Astrophysical Phenomena · Physics 2023-07-28 Constantinos Kalapotharakos , Zorawar Wadiasingh , Alice K. Harding , Demosthenes Kazanas

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…

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