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Type I X-ray bursts' spectra and fuel composition from the atoll and transient source 4U 173022
Yongqi Lu, Zhaosheng Li, Yuanyue Pan +8
NICER observed two outbursts from the neutron star low-mass X-ray binary 4U~173022 in 2021 and 2022, which showed a similar spectral evolution in the hardness-intensity diagram.…
Pulsar Glitches: A Review
Shiqi Zhou, Erbil Gügercinoğlu, Jianping Yuan +2
of all known pulsars have been observed to exhibit sudden spin-up events, known as glitches. For more than fifty years, these phenomena have played an important role in…
On torque reversal during delayed spin up glitch of SGR 1935+2154
Wei-Hua Wang, Ming-Yu Ge, Xi Huang +1
Ge et al. reported a peculiar large glitch observed from SGR 1935 recently~\citep{2022arXiv221103246G}. % Interestingly, this glitch occurred about before FR…
A giant glitch from the magnetar SGR J1935+2154 before FRB 200428
Mingyu Ge, Yuan-Pei Yang, Fangjun Lu +11
Fast radio bursts (FRBs) are short pulses observed in radio frequencies usually originating from cosmological distances. The discovery of FRB 200428 and its X-ray counterpart from…
Return of 4U~1730--22 after 49 years silence: the spectral properties of the 2021/2022 outbursts observed by NICER and Insight-HXMT and the soft-to-hard state transition caused by the propeller effect
Yu-Peng Chen, Shu Zhang, Shuang-Nan Zhang +10
After in quiescence for 49 years, 4U~1730--22 became active and had two outbursts in 2021 \& 2022, the onset and tail of the outbursts were observed by NICER, which give us a peerl…
Neutral Atmospheric Density Measurement Using Insight-HXMT Data by Earth Occultation Technique
Wang-Chen Xue, Xiao-Bo Li, Shao-Lin Xiong +12
The Earth occultation technique has broad applications in both astronomy and atmospheric density measurements. We construct the background model during the occultation of the Crab…