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Microstructure emission, involving short time scale, often quasi-periodic, intensity fluctuations in subpulse emission, is well known in normal period pulsars. In this letter, we present the first detections of quasi-periodic microstructure…

高能天体物理现象 · 物理学 2016-12-06 Kishalay De , Yashwant Gupta , Prateek Sharma

Millisecond pulsars (MSPs) represent nearly half of the more than 160 currently known $\gamma$-ray pulsars detected by the Large Area Telescope on the \textit{Fermi} satellite, and a third of all known MSPs are seen in $\gamma$ rays. The…

高能天体物理现象 · 物理学 2016-03-02 L. Guillemot , D. A. Smith , H. Laffon , G. H. Janssen , I. Cognard , G. Theureau , G. Desvignes , E. C. Ferrara , P. S. Ray

Flux densities are basic observation parameters to describe pulsars. In the most updated pulsar catalog, 24% of the listed radio pulsars have no flux density measurement at any frequency. Here, we report the first flux density measurements,…

高能天体物理现象 · 物理学 2022-07-27 Z. R. Zhou , J. B. Wang , N. Wang , G. Hobbs , S. Q. Wang

In this study, we investigate the contribution of millisecond pulsars (MSPs) to the gamma-ray excess observed in the Galactic Center by analyzing data from high-resolution direct N-body simulations of six globular clusters (GCs) that…

高能天体物理现象 · 物理学 2024-10-22 Dana Kuvatova , Taras Panamarev , Maryna Ishchenko , Anton Gluchshenko , Peter Berczik

LOFAR offers the unique capability of observing pulsars across the 10-240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well-suited for studying the frequency evolution of pulse profile morphology…

We study the field millisecond pulsar (MSP) population to infer its intrinsic distribution in spin period and luminosity and to determine its spatial distribution within the Galaxy. Our likelihood analysis on data from extant surveys (22…

天体物理学 · 物理学 2009-10-30 J. M. Cordes , David F. Chernoff

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…

高能天体物理现象 · 物理学 2012-09-19 T. J. Johnson

The Galactic interstellar turbulence affects the density distribution and star formation. We introduce a new method of measuring interstellar turbulent density spectra by using the dispersion measures (DMs) of a large sample of pulsars.…

星系天体物理 · 物理学 2021-01-06 Siyao Xu , Bing Zhang

We estimate the contribution of Galactic pulsars, both ordinary and millisecond pulsars (MSPs), to the high-energy (>100 MeV) gamma-ray background. We pay particular attention to the high-latitude part of the background that could be…

高能天体物理现象 · 物理学 2010-01-15 C. -A. Faucher-Giguere , Abraham Loeb

We present average flux density measurements of 151 radio pulsars at 1.4 GHz with the Parkes 'Murriyang' radio telescope. We recommend our results be included in the next version of the ATNF pulsar catalogue. The large sample of pulsars…

高能天体物理现象 · 物理学 2023-01-25 Ziyang Wang , Jingbo Wang , Na Wang , Shi Dai , Jintao Xie

Several groups of authors have analyzed Fermi LAT data in a region around the Galactic Center finding an unaccounted gamma-ray excess over diffuse backgrounds in the GeV energy range. It has been argued that it is difficult or even…

高能天体物理现象 · 物理学 2015-06-23 Jovana Petrovic , Pasquale D. Serpico , Gabrijela Zaharijas

The X-ray and gamma-ray spectrum of rotation-powered millisecond pulsars is investigated in a model for acceleration and pair cascades on open field lines above the polar caps. Although these pulsars have low surface magnetic fields, their…

天体物理学 · 物理学 2016-08-30 Alice K. Harding , Vladimir V. Usov , Alex G. Muslimov

Modeling of frequency-dependent effects, contributed by the turbulence in the free electron density of interstellar plasma, is required to enable the detection of the expected imprints from the stochastic gravitational-wave (GW) background…

The number of millisecond pulsars (MSPs) observed in Milky Way globular clusters has increased explosively in recent years, but the underlying population is still uncertain due to observational biases. We use state-of-the-art $N$-body…

高能天体物理现象 · 物理学 2022-12-07 Claire S. Ye , Giacomo Fragione

We conducted radio interferometric observations of six pulsars at 610 MHz using the Giant Metrewave Radio Telescope (GMRT). All these objects were claimed or suspected to be the gigahertz-peaked spectra (GPS) pulsars. For a half of the…

高能天体物理现象 · 物理学 2015-06-24 M. Dembska , R. Basu , J. Kijak , W. Lewandowski

Abridged) We model the X-ray properties of millisecond pulsars (MSPs) by considering hot spot emission from a weakly magnetized rotating neutron star (NS) covered by an optically-thick hydrogen atmosphere. We investigate the limitations of…

天体物理学 · 物理学 2009-11-13 Slavko Bogdanov , Jonathan E. Grindlay , George B. Rybicki

We present the flux density measurements of the pulsars observed in the Meterwavelength single-pulse polarimetric emission survey. The average flux densities were estimated in 113 pulsars at two frequencies of 325 and 610 MHz using…

高能天体物理现象 · 物理学 2021-08-25 Rahul Basu , Dipanjan Mitra , George I. Melikidze

We present integrated pulse profiles at 5~GHz for 71 pulsars, including eight millisecond pulsars (MSPs), obtained using the Shanghai Tian Ma Radio Telescope (TMRT). Mean flux densities and pulse widths are measured. For 19 normal pulsars…

高能天体物理现象 · 物理学 2019-04-03 Ru-Shuang Zhao , Zhen Yan , Xin-Ji Wu , Zhi-Qiang Shen , R. N. Manchester , Jie Liu , Guo-Jun Qiao , Ren-Xin Xu , Ke-Jia Lee

This study presents a comprehensive analysis of the spectral properties of 886 pulsars across a wide frequency range from 20MHz to 343.5GHz, including a total of 86 millisecond pulsars. The majority of the pulsars exhibit power-law behavior…

Pulsar timing arrays provide a unique means to detect nanohertz gravitational waves through long-term measurements of pulse arrival times from an ensemble of millisecond pulsars. After years of observations, some timing array pulsars have…

高能天体物理现象 · 物理学 2020-07-30 Boris Goncharov , Xing-Jiang Zhu , Eric Thrane