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Galaxies
Special Issues
X-ray Polarization: A New Era Begins
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X-ray Polarization: A New Era Begins

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

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 733

Special Issue Editors

Dr. Ioannis Liodakis

E-Mail Website
Guest Editor
NASA Marshall Space Flight Center, 320 Sparkman Dr., Huntsville, AL 35805, USA
Interests: multiwavelength polarization; supermassive black holes; astrophysical jets
Dr. Philip Kaaret

E-Mail Website
Guest Editor
NASA Marshall Space Flight Center, 320 Sparkman Dr., Huntsville, AL 35805, USA
Interests: X-ray polarization; X-ray instrumentation; (accreting) black holes; neutron stars; jets; supernova remnants
Dr. Steven Ehlert

E-Mail Website
Guest Editor
NASA Marshall Space Flight Center, 320 Sparkman Dr., Huntsville, AL 35805, USA
Interests: X-ray polarization; (accreting) black holes; jets; galaxy clusters

Special Issue Information

Dear Colleagues,

The recent launch of the Imaging X-ray Polarimetry Explorer has ushered in a new era of high-energy astrophysics. High-energy polarization is the latest window into the universe that was opened in December 2021, promising to revolutionize our understanding of the cosmos. Indeed, these past two years have seen remarkable new discoveries, affirmed or revised our understanding of the high-energy processes, and settled decades-old debates. The purpose of this Special Issue is to summarize our current understanding of the X-ray polarization signatures from astrophysical objects and highlight the achievements to date of the IXPE mission. We also chart the way forward with IXPE operating as a community instrument and with the launch of new X-ray polarimetry missions.

Dr. Ioannis Liodakis
Dr. Philip Kaaret
Dr. Steven Ehlert
Guest Editors

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. Galaxies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). 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

  • X-ray polarization
  • high-energy processes
  • astrophysical jets
  • black holes
  • neutron stars
  • supernovae remnants
  • X-ray binaries
  • magnetars
  • pulsar wind nebulae

Published Papers (2 papers)

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Review

9 pages, 2216 KiB  
Review
On the Making of IXPE
by Martin C. Weisskopf and Brian Ramsey
Galaxies 2024, 12(4), 38; https://doi.org/10.3390/galaxies12040038 - 16 Jul 2024
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Abstract
Drs. Weisskopf and Ramsey were the original Principal and Deputy Principal Investigators of the Imaging X-ray Polarimetry Explorer (IXPE). They outline the path to the development of IXPE and discuss the technical and programmatic history that led up to the mission, a partnership [...] Read more.
Drs. Weisskopf and Ramsey were the original Principal and Deputy Principal Investigators of the Imaging X-ray Polarimetry Explorer (IXPE). They outline the path to the development of IXPE and discuss the technical and programmatic history that led up to the mission, a partnership between the Italian Space Agency and NASA, and the first fully dedicated to imaging X-ray polarimetry in the 2–8 keV band. An admittedly biased, as seen through the eyes of the original and Deputy Principal Investigators, technical overview of the development of the historical and critical scientific instrumentation is provided. The outstanding, and often paradigm-shifting results are presented in the papers following this one. Full article
(This article belongs to the Special Issue X-ray Polarization: A New Era Begins)
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11 pages, 548 KiB  
Review
An Examination of the Very First Polarimetric X-ray Observations of Radio-Quiet Active Galactic Nuclei
by Frédéric Marin, Vittoria E. Gianolli, Adam Ingram, Dawoon E. Kim, Andrea Marinucci, Daniele Tagliacozzo and Francesco Ursini
Galaxies 2024, 12(4), 35; https://doi.org/10.3390/galaxies12040035 - 2 Jul 2024
Viewed by 264
Abstract
Active galactic nuclei (AGNs), either radio-quiet or radio-loud, had never been observed in X-ray polarized light until the advent of the Imaging X-ray Polarimetry Explorer (IXPE) in the end of 2021. This satellite opened a new observational window for studying supermassive black holes [...] Read more.
Active galactic nuclei (AGNs), either radio-quiet or radio-loud, had never been observed in X-ray polarized light until the advent of the Imaging X-ray Polarimetry Explorer (IXPE) in the end of 2021. This satellite opened a new observational window for studying supermassive black holes and their complex environment. In this regard, radio-quiet AGNs are probably better targets than radio-loud objects to probe accretion processes due to the lack of synchrotron emission from jets that can dilute the polarized signal from the central engine. Their relatively clean environment not only allows to detect and measure the X-ray polarization originating from the hot corona responsible for X-ray emission, but also to assess the geometry of the media immediately surrounding the supermassive black hole. Such geometrical measurements work just as well for characterizing the corona morphology in pole-on AGNs as it does for determining the three-dimensional shape of the circumnuclear cold obscurer (the so-called torus) in edge-on AGNs. In this review paper, we will return to each of the observations made by IXPE so far in the field of radio-quiet AGNs and highlight the fundamental contribution of X-ray polarimetry to our understanding of how light is emitted and how matter is shaped around supermassive black holes. Full article
(This article belongs to the Special Issue X-ray Polarization: A New Era Begins)
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