Simultaneous 2.25/8.60 GHz observations of the newly discovered magnetar – Swift J1818.0–1607

Author:

Huang Zhi-Peng123,Yan Zhen124,Shen Zhi-Qiang1234,Tong Hao5ORCID,Lin Lin6,Yuan Jian-Ping247,Liu Jie123,Zhao Ru-Shuang89,Ge Ming-Yu10,Wang Rui12

Affiliation:

1. Shanghai Astronomical Observatory, CAS, Shanghai 200030, China

2. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China

3. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

4. Key Laboratory of Radio Astronomy, CAS, 10 Yuanhua Road, Nanjing, JiangSu 210033, China

5. School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China

6. Department of Astronomy, Beijing Normal University, Beijing 100875, China

7. Xinjiang Astronomical Observatory, CAS, Xinjiang 830011, China

8. School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China

9. Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang 550001, China

10. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, CAS, 19B Yuquan Road, Beijing 100049, China

Abstract

ABSTRACT Swift J1818.0–1607 discovered in early 2020 is not only the fifth magnetar known with periodic radio pulsations but also the fastest rotating one. Simultaneous 2.25/8.60 GHz observations of Swift J1818.0–1607 were carried out with Shanghai Tian Ma Radio Telescope (TMRT) from MJD 58936 to 59092. The spin-frequency ν and first-order derivative $\dot{\nu }$ of this magnetar were obtained with piecewise fitting method because of its instable timing properties. We found that the amplitude of short-term $\dot{\nu }$ fluctuations decreased with time, and the long-term declining trend of ν discovered previously continued in our observations. The best fit long-term $\dot{\nu }$ were about $-2.25\times 10^{-11} \, \mathrm{s}^{-2}$ using our observation data spanning 156 d. The derived characteristic age was about 522 yr, supporting the recent viewpoint that this magnetar may be older than initially thought shortly after its discovery. The flux density of this magnetar was increased at both 2.25 and 8.60 GHz during our observations, and its radio spectrum became flatter at the same time. We also detected bright-quiet type emission mode switching in Swift J1818.0–1607.

Funder

Natural Science Foundation of Shanghai

National Natural Science Foundation of China

CAS

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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