| Spin-down and emission variations for PSR J0742-2822 |
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| 作者姓名： | Shi-Jun Dang Na Wang Hui-Hui Wang Jian-Ping Yuan Lun-Hua Shang Rai Yuen Ming-Yu Ge Xia Zhou Shuang-Qiang Wang Fei-Fei Kou Wen-Ming Yan Jing-Bo Wang Zhi-Gang Wen Jun-Tao Bai Zhi-Yong Liu Zu-Rong Zhou |
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| 作者单位： | Xinjiang Astronomical Observatory;University of Chinese Academy of Sciences;Key Laboratory of Radio Astronomy;School of Physics;School of Electronic and Optical Engineering;Key Laboratory of Particle Astrophysics;CAS Key Laboratory of FAST;School of Physics and Electronic Science;Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing |
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| 基金项目： | supported by the National Key Research and Development Program of China(2016YFA0400804,2017YFA0402602,2018YFA0404603 and 2018YFA0404703);the Operation,Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments,budgeted from the Ministry of Finance of China(MOF)and administered by the Chinese Academy of Sciences(CAS),the National Natural Science Foundation of China(Grant Nos.11873080,U1831102,U1731238,U1938109,U1838104,11873040,11573010,11661161010,U1631103 and U1838102);the Youth Innovation Promotion Association of Chinese Academy of Sciences,the CAS“Light of West China”Program(Nos.2018-XBQNXZ-B-023,2018-XBQNXZ-B-025 and 2016-QNXZ-B-24);the Tianshan Youth Program No.2018Q039;the Open Project Program of the Key Laboratory of FAST,NAOC,Chinese Academy of Sciences,the China Postdoctoral Science Foundation grant(2019M650847);the 2016 and 2018 Project of Xinjiang Uygur Autonomous Region of China for Flexibly Fetching in Upscale Talents and the Science and Technology Fund of Guizhou Province(Grant Nos.(2016)–4008 and(2017)5726–37);part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO。 |
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| 摘 要： | PSR J0742-2822 is known for its quasi-periodic changes in the observed pulse profile and spindown rate.In this paper,we analyzed 13 years of timing data obtained with the Nanshan 25-m radio telescope and the Parkes 64-m radio telescope.We found that the average values of the spin-down rate((v))of this pulsar changed in four different states.We investigated the correlation between v and W50,and ascertained that the correlation changed in different states.Moreover,not all the changes in states and correlation can be associated with glitch activities.We examined the long term evolution ofγ-ray flux(0.1-300 GeV)and the pulse profiles corresponding to the four different states using Fermi-LAT Pass8(P8 R3)data from 2008 August 5 to 2019 October 1.We did not detect a significant change inγ-ray flux or the pulse profile.Our results suggest that the connection between pulsar rotation and emission is more complex than previously reported for this pulsar.
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| 关 键 词： | PULSARS general-stars pulsar-methods TIMING |
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