期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 476, 期 3, 页码 3677-3687出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty470
关键词
stars; magnetars stars; neutron pulsars; general pulsars; individual; PSR J1745-2900
资金
- National Basic Research Program of China (973 Program) [2015CB857100]
- West Light Foundation of Chinese Academy of Sciences [XBBS201422]
- National Natural Science Foundation of China [U1631106, U1731238]
- Chinese Academy of Sciences [XDB23010200]
- National Key Research and Development Program of China [2016YFA0400800]
- West light Foundation of CAS [2016-QNXZ-B-24]
- Commonwealth of Australia
We report on single-pulse observations of the Galactic centre magnetar PSR J1745-2900 that were made using the Parkes 64-m radio telescope with a central frequency of 3.1 GHz at five observing epochs between 2013 July and August. The shape of the integrated pulse profiles was relatively stable across the five observations, indicating that the pulsar was in a stable state between MJDs 56475 and 56514. This extends the known stable state of this pulsar to 6.8 months. Short-term pulse shape variations were also detected. It is shown that this pulsar switches between two emission modes frequently and that the typical duration of each mode is about 10 min. No giant pulses or subpulse drifting were observed. Apparent nulls in the pulse emission were detected on MJD 56500. Although there are many differences between the radio emissions of magnetars and normal radio pulsars, they also share some properties. The detection of mode changing and pulse nulling in PSR J1745-2900 suggests that the basic radio emission process for magnetars and normal pulsars is the same.
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