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Universe
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Frontiers in Pulsars Astrophysics
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Frontiers in Pulsars Astrophysics

A special issue of Universe (ISSN 2218-1997). This special issue belongs to the section "Compact Objects".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 5742

Special Issue Editor

Prof. Dr. Chengmin Zhang

E-Mail Website
Guest Editor
1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
2. The University of Chinese Academy of Sciences, Beijing 100049, China
Interests: pulsar and neutron star; millisecond pulsar; magnetar; gravitational waves; fast radio burst; relativistic astrophysics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Pulsar and neutron star (NS) astrophysics and astronomy have been one of the most  active research areas since its first discovery in 1967. Nowadays, over 3000 such objects have been found by the ground-based radio telescopes and space satellite based high energy detectors, thus the multi-energy bands and multi-frequency EM spectra present us many aspects of neutron stars. Excitingly, with the rich and fruitful discoveries by LIGO and Virgo gravitational wave detectors, especially the rare mergers of double neutron stars and black hole neutron star binary system, the multi-messenger times is excitingly standing in front of our horizon. Without a doubt, many outstanding achievements have extended our perspective on compact objects and universe, which would greatly improve our understanding of current and future research objectives.  

The purpose of this Special Issue is to review the current developments and future perspectives, and brings together various topics on pulsars and neutron stars to form a whole picture of the current understanding of physics. We try to cover the research topics as more as possible, both theory and observation, then, in particular, we would like to focus on the currently hot topics, such as young pulsars, pulsar wind nebula, and supernovae; NS formation and EOS, mass and radius, cooling, glitch, braking index, and magnetic evolution; RRATs to Intermittent pulsars; magnetars; CCO and isolated NS; binary and millisecond pulsars; pulsar and tests of general relativity, NS, and gravitational wave; pulsar and interstellar medium; giant radio pulses and radiation mechanisms; accreting X-ray pulsars, NS transients; high/low-mass X-ray binaries and bursts, as well as the observational facilities such as FAST, SKA, LOFAR telescopes, and NICER, etc. In addition, it is also encouraged for the creative ideas on the enhancement and progress of pulsar and neutron star research fields.

Prof. Dr. Chengmin Zhang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Universe is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • pulsar 
  • neutron star 
  • magnetar 
  • millisecond pulsar 
  • gravitational waves

Published Papers (2 papers)

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Research

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20 pages, 1384 KiB  
Article
Evolution of Spin Period and Magnetic Field of the Crab Pulsar: Decay of the Braking Index by the Particle Wind Flow Torque
by Cheng-Min Zhang, Xiang-Han Cui, Di Li, De-Hua Wang, Shuang-Qiang Wang, Na Wang, Jian-Wei Zhang, Bo Peng, Wei-Wei Zhu, Yi-Yan Yang and Yuan-Yue Pan
Universe 2022, 8(12), 628; https://doi.org/10.3390/universe8120628 - 28 Nov 2022
Cited by 4 | Viewed by 1458
Abstract
The evolutions of a neutron star’s rotation and magnetic field (B-field) have remained unsolved puzzles for over half a century. We ascribe the rotational braking torques of pulsar to both components, the standard magnetic dipole radiation (MDR) and particle wind flow (MDR + [...] Read more.
The evolutions of a neutron star’s rotation and magnetic field (B-field) have remained unsolved puzzles for over half a century. We ascribe the rotational braking torques of pulsar to both components, the standard magnetic dipole radiation (MDR) and particle wind flow (MDR + Wind, hereafter named MDRW), which we apply to the Crab pulsar (B0531 + 21), the only source with a known age and long-term continuous monitoring by radio telescope. Based on the above presumed simple spin-down torques, we obtain the exact analytic solution on the rotation evolution of the Crab pulsar, together with the related outcomes as described below: (1) unlike the constant characteristic B-field suggested by the MDR model, this value for the Crab pulsar increases by a hundred times in 50 kyr while its real B-field has no change; (2) the rotational braking index evolves from ∼3 to 1 in the long-term, however, it drops from 2.51 to 2.50 in ∼45 years at the present stage, while the particle flow contributes approximately 25% of the total rotational energy loss rate; (3) strikingly, the characteristic age has the maximum limit of ∼10 kyr, meaning that it is not always a good indicator of a real age. Furthermore, we discussed the evolutionary path of the Crab pulsar from the MDR to the wind domination by comparing with the possible wind braking candidate pulsar PSR J1734-3333. Full article
(This article belongs to the Special Issue Frontiers in Pulsars Astrophysics)
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Review

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41 pages, 1887 KiB  
Review
Pulsar Glitches: A Review
by Shiqi Zhou, Erbil Gügercinoğlu, Jianping Yuan, Mingyu Ge and Cong Yu
Universe 2022, 8(12), 641; https://doi.org/10.3390/universe8120641 - 1 Dec 2022
Cited by 23 | Viewed by 3285
Abstract
∼6% of all known pulsars have been observed to exhibit sudden spin-up events, known as glitches. For more than fifty years, these phenomena have played an important role in helping to understand pulsar (astro)physics. Based on the review of pulsar glitches [...] Read more.
∼6% of all known pulsars have been observed to exhibit sudden spin-up events, known as glitches. For more than fifty years, these phenomena have played an important role in helping to understand pulsar (astro)physics. Based on the review of pulsar glitches search method, the progress made in observations in recent years is summarized, including the achievements obtained by Chinese telescopes. Glitching pulsars demonstrate great diversity of behaviours, which can be broadly classified into four categories: normal glitches, slow glitches, glitches with delayed spin-ups, and anti-glitches. The main models of glitches that have been proposed are reviewed and their implications for neutron star structure are critically examined regarding our current understanding. Furthermore, the correlations between glitches and emission changes, which suggest that magnetospheric state-change is linked to the pulsar-intrinsic processes, are also described and discussed in some detail. Full article
(This article belongs to the Special Issue Frontiers in Pulsars Astrophysics)
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