| Issue |
A&A
Volume 711, July 2026
|
|
|---|---|---|
| Article Number | A274 | |
| Number of page(s) | 6 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361/202659647 | |
| Published online | 21 July 2026 | |
Radio eclipse of the slowest spinning Galactic-field spider pulsar PSR J1932+2121 and its X-ray emission prospect
1
Institute of Astrophysics, Central China Normal University, Wuhan 430079, China
2
Laboratory for Compact Object Astrophysics and Astronomical Technology, Central China Normal University, Wuhan 430079, China
3
National Astronomical Observatories, Chinese Academy of Sciences, Jia-20 Datun Road ChaoYang District Beijing 100012, China
4
School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
5
Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, Beijing 100101, China
6
School of Physical Science and Technology, Southwest University, Chongqing 400715, China
★ Corresponding authors: This email address is being protected from spambots. You need JavaScript enabled to view it.
; This email address is being protected from spambots. You need JavaScript enabled to view it.
; This email address is being protected from spambots. You need JavaScript enabled to view it.
Received:
28
February
2026
Accepted:
9
June
2026
Abstract
PSR J1932+2121 is a newly discovered spider pulsar with a pronounced radio eclipse identified by the Five-hundred-meter Aperture Spherical radio Telescope (FAST); it provides an ideal laboratory for studying the eclipse mechanism and high-energy emission from its intrabinary shock (IBS). By modeling the orbital-phase-dependent dispersion measure variations and flux profiles during the eclipse region with the wind interaction and IBS geometry, we constrain the system to a nearly edge-on inclination (io ≃ 88.55°) and a weak stellar wind from a low-mass main-sequence companion. Our analysis of the eclipse mechanism suggests that synchrotron absorption by nonthermal electrons can reproduce the observed flux variations with reasonable parameters for the eclipsing medium. We further predict the synchrotron emission from the IBS in PSR J1932+2121, showing that its X-ray flux, particularly near the inferior conjunction of the companion star, could be detectable with XMM/EPIC, EP/FXT, or eXTP/SFA and should exhibit double-peaked orbital modulation by Doppler boosting. These results provide a theoretical framework for understanding this system and for guiding future multiwavelength probes of spider pulsars.
Key words: magnetic reconnection / radiation: dynamics / binaries: eclipsing / stars: winds / outflows
© The Authors 2026
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model. This email address is being protected from spambots. You need JavaScript enabled to view it. to support open access publication.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.