Special Issue "Observations of Gamma-Ray Pulsars"

A special issue of Galaxies (ISSN 2075-4434).

Deadline for manuscript submissions: 15 May 2019

Special Issue Editor

Guest Editor
Prof. Dr. Roberto Mignani

INAF - Istituto di Astrofisica Spaziale e Fisica Cosmica Milano, via E. Bassini 15, 20133, Milano, Italy
Website | E-Mail
Interests: multi-wavelength astronomy; pulsars; neutron stars

Special Issue Information

Dear Colleagues,

The NASA's Fermi Gamma-ray Space Telescope marked a revolution in pulsar gamma-ray astronomy, thanks to the unprecedented performance of its Large Area Telescope (LAT), having detected now more than 200 pulsars in gamma-rays, compared with the seven known before its launch in June 2008. About a quarter of these pulsars have been discovered in gamma-rays and they are still lacking a radio detection. The existence of a significant population of these “radio-quiet” pulsars was expected since the discovery of the prototype of this class, the gamma-ray pulsar Geminga, back in the early 1970s. Quite unexpectedly, about half of the gamma-ray pulsars discovered by Fermi are Gyr-old millisecond pulsars, which are a few orders of magnitude less energetic than the bulk of the young pulsar population. This discovery has triggered, among other things, a profound rethinking of gamma-ray emission models in pulsars. With Fermi extending its mission this reach harvest of gamma-ray pulsars is set to continue, possibly with the detection of those still hiding among the hundreds of unidentified gamma-ray sources.

It is now clear that this provides us with an unprecedentedly large and diverse sample to start characterising the pulsar spectra from the gamma rays to the optical, and understand how the complex radiation processes in pulsar magnetospheres work, which is key to understand the behaviour of relativistic particles and radiation under extreme magnetic fields.

The goals of this Special Issue are to set the state-of-the-art after ten years of pulsar observations by Fermi, present the results of their multi-wavelength follow-ups and how this helped to understand the pulsar emission physics, and outline the research plans for the next few years.

Prof. Dr. Roberto Mignani
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 papers will be 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. Galaxies is an international peer-reviewed open access quarterly journal published by MDPI.

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Keywords

  • pulsars
  • gamma-rays
  • multi-wavelength

Published Papers (1 paper)

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Research

Open AccessArticle Searching for Gamma-Ray Millisecond Pulsars: Selection of Candidates Revisited
Received: 29 December 2018 / Revised: 31 January 2019 / Accepted: 5 February 2019 / Published: 7 February 2019
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Abstract
We are starting a project to find γ-ray millisecond pulsars (MSPs) among the unidentified sources detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope (Fermi), by radio observations. The selection of good candidates from analysis of the LAT [...] Read more.
We are starting a project to find γ -ray millisecond pulsars (MSPs) among the unidentified sources detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope (Fermi), by radio observations. The selection of good candidates from analysis of the LAT data is an important part of the project. Given that there is more than 10 years worth of LAT data and the advent of the newly released LAT 8-year point source list (FL8Y), we have conducted a selection analysis, on the basis of our previous analysis, and report the results here. Setting the requirements for the unidentified sources in FL8Y of Galactic latitudes | b | > 5 and curvature significances >3 σ , there are 202 sources with detection signficances >6 σ . We select 57 relatively bright ones (detection significances >15 σ ) and analyze their 10.2 years of LAT data. Their variability is checked to exclude variable sources (likely blazars), test statistic maps are constructed to avoid contaminated sources, and curvature significances are re-obtained and compared to their γ -ray spectra to exclude non-significant sources. In the end, 48 candidates are found. Based on the available information, mostly from multi-wavelength studies, we discuss the possible nature of several of the candidates. Most of these candidates are currently being observed with the 65-meter Shanghai Tian Ma Radio Telescope. Full article
(This article belongs to the Special Issue Observations of Gamma-Ray Pulsars)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Authors list:

Prof. Bronek Rudak
Dr. David Hui
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