首页|Searching for the Highest Energy of Pulsation and Critical Luminosity of Swift J0243.6+6124 Observed by Insight-HXMT

Searching for the Highest Energy of Pulsation and Critical Luminosity of Swift J0243.6+6124 Observed by Insight-HXMT

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Owing to the broad energy coverage of Insight-HXMT in the hard X-ray band,we detected the highest energy of pulsation exceeding 200 keV around the 2017-2018 outburst peak of the first Galactic pulsating ultraluminous X-ray source(PULX)Swift J0243.6+6124,which is the highest energy detected from PULXs to date.We also obtained the highest energy of pulsation of every exposure during the outburst in 2017-2018,and found the highest energy is roughly positively correlated with luminosity.Using our newly developed method,we identified the critical luminosity being 4 × 1038 ergs-1 when the main peaks of the low and high energy pulse profiles became aligned,which separates the fan-beam dominated and pencil-beam dominated accretion regimes.Above the critical luminosity,the phase of the main peak shifted gradually from 0.5 to 0.8 until the outburst peak in all energy bands is reached,which is in agreement with the phase shift found previously at low energies.Our result is consistent with what is derived from spectral analysis.

(stars:)pulsars:individual(Swift J0243.6+6124)X-rays:binariesstars:neutron

Qing-Xia Zhao、Xian Hou、Ming-Yu Ge、Shuang-Nan Zhang、Yun-Xiang Xiao、You-Li Tuo、Zi-Xu Yang、Ling-Da Kong、Jin-Lu Qu、Shu Zhang、Jian-Cheng Wang

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Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China

Key Laboratory of Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China

University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing 100049,China

Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650216,China

Institut für Astronomie und Astrophysik,Sand 1,D-72076 Tübingen,Geremany

School of Physics and Optoelectronic Engineering,Shandong University of Technology,Zibo 255000,China

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Insight-HXMT mission,a project funded by China National Space Administration(CNSA)Chinese Academy of Sciences(CAS)National Key R&D Program of China from the Minister of Science and Technology of China(MOST)National Key R&D Program of China from the Minister of Science and Technology of China(MOST)National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaInternational Partnership Program of Chinese Academy of Sciences

2021YFA07185002023YFE01012001237305112333007113111KYSB20190020

2024

10.1088/1674-4527/ad3902

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(5)
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