Discovery of X-ray pulsations from "next Geminga" - PSR J1836+5925
L. C. C. Lin (1), C. Y. Hui (2), K. T. Li (3), J. Takata (4), C. P. Hu, (5), A. K. H. Kong (1), D. C. C. Yen (6), Y. Chou (5) ((1) National Tsing, Hua University, (2) Chungnam National University, (3) China Medical, University, (4) The University of Hong Kong
TL;DR
This paper reports the discovery of X-ray pulsations from PSR J1836+5925, confirming its status as a pulsar with thermal X-ray emission likely from hot spots, and compares its X-ray and gamma-ray profiles.
Contribution
First detection of X-ray pulsations from PSR J1836+5925, revealing thermal emission and phase alignment with gamma-ray data.
Findings
X-ray pulsation period of ~173.3 ms confirmed
X-ray emission is thermally dominant from hot spots
X-ray and gamma-ray profiles show different pulse shapes
Abstract
We report the X-ray pulsation of ~173.3 ms for the "next Geminga", PSR J1836+5925, with recent XMM-Newton investigations. The X-ray periodicity is consistent wtih the gamma-ray ephemeris at the same epoch. The X-ray folded light curve has a sinusoidal structure which is different from the double-peaked gamma-ray pulse profile. We have also analysed the X-ray phase-averaged spectra which shows the X-ray emission from PSR J1836+5925 is thermal dominant. This suggests the X-ray pulsation mainly originates from the modulated hot spot on the stellar surface.
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