Spin-down and emission variations for PSR J0742−2822,Research in Astronomy and Astrophysics

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Spin-down and emission variations for PSR J0742−2822
Research in Astronomy and Astrophysics ( IF 1.8 ) Pub Date : 2021-03-19 , DOI: 10.1088/1674-4527/21/2/42
Shi-Jun Dang _{1,

2} , Na Wang _{1,

3} , Hui-Hui Wang ₄ , Jian-Ping Yuan _{1,

3} , Lun-Hua Shang _{5,

6} , Rai Yuen _{1,

3} , Ming-Yu Ge ₇ , Xia Zhou _{1,

3} , Shuang-Qiang Wang _{1,

2} , Fei-Fei Kou _{1,

6} , Wen-Ming Yan _{1,

3} , Jing-Bo Wang _{1,

3} , Zhi-Gang Wen _{1,

3} , Jun-Tao Bai _{8,

9} , Zhi-Yong Liu _{1,

3} , Zu-Rong Zhou _{1,

2}

Affiliation

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 ( $\langle \dot{\nu }\rangle$ ) of this pulsar changed in four different states. We investigated the correlation between $\dot{\nu }$ and W ₅₀, and ascertained that the correlation changed in different $\langle \dot{\nu }\rangle$ states. Moreover, not all the changes in $\langle \dot{\nu }\rangle$ states and correlation can be associated with glitch activities. We examined the long term evolution of γ-ray flux (0.1–300 GeV) and the pulse profiles corresponding to the four different states using Fermi-LAT Pass 8 (P8R3) data from 2008 August 5 to 2019 October 1. We did not detect a significant change in γ-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.

中文翻译：

PSR J0742−2822 的减速和发射变化

PSR J0742-2822 以其观察到的脉冲轮廓和自旋下降率的准周期性变化而闻名。在本文中，我们分析了南山 25 米射电望远镜和帕克斯 64 米射电望远镜获得的 13 年计时数据。我们发现 $\langle \dot{\nu }\rangle$ 这颗脉冲星的自旋下降率 ( )的平均值在四种不同的状态下发生了变化。我们研究了W ₅₀ $\dot{\nu }$ 和W ₅₀之间的相关性，并确定相关性在不同 $\langle \dot{\nu }\rangle$ 状态下发生了变化。此外，并非所有 $\langle \dot{\nu }\rangle$ 状态和相关性的变化都与故障活动有关。我们检查了γ 的长期演变使用 2008 年 8 月 5 日至 2019 年 10 月 1 日期间的 Fermi-LAT Pass 8 (P8R3) 数据，-射线通量（0.1-300 GeV）和对应于四种不同状态的脉冲轮廓。我们没有检测到γ射线通量的显着变化或脉冲轮廓。我们的结果表明，脉冲星自转和发射之间的联系比之前报道的这颗脉冲星更复杂。

更新日期：2021-03-19

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