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We report the detection of a glitch event in the pulsar J1709$-$4429 (also known as B1706$-$44) during regular monitoring observations with the Molonglo Observatory Synthesis Telescope (UTMOST). The glitch was found during timing…

Pulsar glitches are attributed to the sudden re-coupling of very weakly coupled large scale superfluid components in the neutron star interior. This process leads to rapid exchange of angular momentum and an increase in spin frequency. The…

高能天体物理现象 · 物理学 2020-12-22 Brynmor Haskell , Vadym Khomenko , Marco Antonelli , Danai Antonopoulou

Pulsars are rapidly spinning and highly magnetized neutron stars, with highly stable rotational period and gradual spin-down over a long timescale due to the loss of radiation. Glitches refer to the events that suddenly increase the…

高能天体物理现象 · 物理学 2016-07-06 C. W. Ng , J. Takata , K. S. Cheng

Glitches are sudden jumps in the spin frequency of pulsars believed to originate in the superfluid interior of neutron stars. Superfluid flow in a model neutron star is simulated by solving the equations of motion of a two-component…

高能天体物理现象 · 物理学 2016-05-25 G. Howitt , B. Haskell , A. Melatos

Pulsar glitches-the sudden spin-up in the rotational frequency of a neutron star-suggest the existence of an angular-momentum reservoir confined to the inner crust of the neutron star. Large and regular glitches observed in the Vela pulsar…

核理论 · 物理学 2015-06-19 J. Piekarewicz , F. J. Fattoyev , C. J. Horowitz

The first large-scale quantum mechanical simulations of pulsar glitches are presented, using a Gross-Pitaevskii model of the crust-superfluid system in the presence of pinning. Power-law distributions of simulated glitch sizes are obtained,…

太阳与恒星天体物理 · 物理学 2015-05-27 L. Warszawski , A. Melatos

Glitch activity refers to the mean increase in pulsar spin frequency per year due to rotational glitches. It is an important tool for studying super-nuclear matter using neutron star interiors as templates. Glitch events are typically…

高能天体物理现象 · 物理学 2024-04-22 Innocent Okwudili Eya , Evaristus Uzochukwu Iyida

We investigate properties of Galactic microlensing events in which a stellar object is lensed by a neutron star. For an all-sky photometric microlensing survey, we determine the number of lensing events caused by $\sim10^{5}$…

星系天体物理 · 物理学 2015-07-03 Shi Dai , Martin C. Smith , Mengxiang Lin , Youling Yue , George Hobbs , Renxin Xu

Data are gathered from the Parkes pulsar data archive of twelve young radio pulsars, with the intervals of data for each pulsar ranged between 2.8 years and 6.8 years. 31 glitches are identified by using phase connection from "pulsar…

高能天体物理现象 · 物理学 2018-06-15 S. Q. Zhou , J. P. Yuan , J. Zhang , M. Q. Liu , Z. W. Feng. S. J. Dang , X. D. Zhu

We have analyzed 5.5 years of timing observations of 7 'slowly' rotating radio pulsars, made with the Westerbork Synthesis Radio Telescope. We present improved timing solutions and 30, mostly small, new glitches. Particularly interesting…

天体物理学 · 物理学 2009-11-11 G. H. Janssen , B. W. Stappers

About 76 glitches in 25 pulsars have been reported to date. Most glitches are `giant', with fractional increases of frequency dnu_0/nu_0 ~ 10^{-6}. 25 glitches were analysed and presented by Shemar & Lyne (1996) who detected them mainly at…

天体物理学 · 物理学 2009-11-07 A. Krawczyk , A. G. Lyne , J. A. Gil , B. C. Joshi

Pulsars are rotating neutron stars, sweeping the emission regions from the magnetic poles across our line of sight. Isolated neutron stars lose angular momentum through dipole radiation and (possibly) particle winds, hence they slow down…

天体物理学 · 物理学 2007-05-23 R Dodson , D. R. Lewis , P. M. McCulloch

Six glitches have been recently observed in the rotational frequency of the young pulsar PSR B1737-30 (J1740-3015) using the 25-m Nanshan telescope of Urumqi Observatory. With a total of 20 glitches in 20 years, it is one of the most…

天体物理学 · 物理学 2009-11-13 W. Z. Zou , N. Wang , R. N. Manchester , J. O. Urama , G. Hobbs , Z. Y. Liu , J. P. Yuan

Pinning of vortex lines in the inner crust of a spinning neutron star may be the mechanism that enhances the differential rotation of the internal neutron superfluid, making it possible to freeze some amount of angular momentum which…

高能天体物理现象 · 物理学 2018-02-07 M. Antonelli , A. Montoli , P. M. Pizzochero

The long-term evolution of the relative rotation of the core superfluid in a neutron star with respect to the rest of the star, at different radial distances from the rotation axis, is determined through model calculations. The core…

天体物理学 · 物理学 2015-06-24 M. Jahan-Miri

The mass of single neutron stars (NSs) can be measured using astrometric microlensing events. In such events, the center-of-light motion of a star lensed by a NS will deviate from the expected non-lensed motion and this deviation can be…

高能天体物理现象 · 物理学 2018-10-31 Eran O. Ofek

We have analyzed 5.5 years of timing observations of 7 ``slowly'' rotating radio pulsars, made with the Westerbork Synthesis Radio Telescope. We present improved timing solutions and 30, mostly small new glitches. The most interesting…

天体物理学 · 物理学 2007-05-23 G. H. Janssen , B. W. Stappers

The Crab Pulsar has exhibited numerous glitches accompanied by persistent shifts in its spin-down rate. The explanation of the observed persistent shifts remain a challenge. We perform a detailed Bayesian analysis to compare four…

高能天体物理现象 · 物理学 2024-09-30 Chun Huang , Xiao-Ping Zheng

With the aim of constraining the structural properties of neutron stars and the equation of state of dense matter, we study sudden spin-ups, glitches, occurring in the Vela pulsar and in six other pulsars. We present evidence that glitches…

天体物理学 · 物理学 2016-08-30 B. Link , R. I. Epstein , J. M. Lattimer

Strange Nuggets are believed to be among the relics of the early universe. They appear as dark matter due to their low charge-to-mass ratio. Their distribution is believed to be the same as that of dark matter. As such, they could be…

高能天体物理现象 · 物理学 2020-07-10 Innocent Okwudili Eya , Evaristus Uzochukwu Iyida , Johnson Ozoemene , Urama , Augustine Ejikeme Chukwude