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Your search keyword '"Dong, Ai-Jun"' showing total 8 results
Start Over Author "Dong, Ai-Jun" Journal monthly notices of the royal astronomical society
8 results on '"Dong, Ai-Jun"'

2. Individual and averaged power density spectra of X-ray bursts from SGR J1935+2154: quasi-periodic oscillation search and slopes

Author

Xiao, Shuo, primary, Li, Xiao-Bo, additional, Xue, Wang-Chen, additional, Xiong, Shao-Lin, additional, Zhang, Shuang-Nan, additional, Peng, Wen-Xi, additional, Dong, Ai-Jun, additional, Tuo, You-Li, additional, Cai, Ce, additional, Luo, Xi-Hong, additional, Yang, Jiao-Jiao, additional, Wang, Yue, additional, Zheng, Chao, additional, Zhang, Yan-Qiu, additional, Liu, Jia-Cong, additional, Tan, Wen-Jun, additional, Wang, Chen-Wei, additional, Wang, Ping, additional, Li, Cheng-Kui, additional, Yi, Shu-Xu, additional, Dang, Shi-Jun, additional, Shang, Lun-Hua, additional, Zhao, Ru-shuang, additional, Ma, Qing-Bo, additional, Xie, Wei, additional, Feng, Jian-Chao, additional, Zhang, Bin, additional, Zhang, Zhen, additional, Ge, Ming-Yu, additional, Zheng, Shi-Jie, additional, Song, Li-Ming, additional, and Zhi, Qi-Jun, additional

Published
2023
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3. Individual and averaged power density spectra of X-ray bursts from SGR J1935+2154: quasi-periodic oscillation search and slopes.

Author

Xiao, Shuo, Li, Xiao-Bo, Xue, Wang-Chen, Xiong, Shao-Lin, Zhang, Shuang-Nan, Peng, Wen-Xi, Dong, Ai-Jun, Tuo, You-Li, Cai, Ce, Luo, Xi-Hong, Yang, Jiao-Jiao, Wang, Yue, Zheng, Chao, Zhang, Yan-Qiu, Liu, Jia-Cong, Tan, Wen-Jun, Wang, Chen-Wei, Wang, Ping, Li, Cheng-Kui, and Yi, Shu-Xu

Subjects
X-ray bursts, POWER density, POWER spectra, X-ray spectra, GAMMA ray bursts, ASTEROSEISMOLOGY, MAGNETARS
Abstract

The study of quasi-periodic oscillations (QPOs) and power density spectra (PDSs) continuum properties can help shed light on the still elusive emission physics of magnetars and as a window into the interiors of neutron stars using asteroseismology. In this work, we employ a PDS method to search for the QPOs in the hundreds of X-ray bursts from SGR J1935+2154 observed by Insight - HXMT, GECAM , and Fermi/ GBM from 2014 July to 2022 January. Although no definitive QPO signal (significance >3 σ) is detected in individual bursts or the averaged periodogram of the bursts grouped by duration, we identify several bursts exhibiting features at ∼40 Hz, attributed to the the proximity intervals between adjacent pulses and consistent with that reported in the X-ray burst associated with FRB 200428. We investigate the PDS continuum properties and find that the distribution of the PDS slope in the simple power-law model peaks at ∼2.5, which is consistent with other magnetars but higher than 5/3 commonly seen in gamma-ray bursts. Besides, the distribution of the break frequency in the broken power-law model peaks at ∼60 Hz. Finally, we report that the power-law index of PDS has an anti-correlation and power-law dependence on the burst duration as well as the minimum variation time-scale. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Discovery of the linear energy dependence of the spectral lag of X-ray bursts from SGR J1935+2154

Author

Xiao, Shuo, primary, Tuo, You-Li, additional, Zhang, Shuang-Nan, additional, Xiong, Shao-Lin, additional, Lin, Lin, additional, Zhang, Yan-Qiu, additional, Wang, Yue, additional, Xue, Wang-Chen, additional, Cai, Ce, additional, Gao, He, additional, Li, Cheng-Kui, additional, Li, Xiao-Bo, additional, Zheng, Chao, additional, Liu, Jia-Cong, additional, Wang, Ping, additional, Wang, Jin, additional, Peng, Wen-Xi, additional, Liu, Cong-Zhan, additional, Li, Xin-Qiao, additional, Wen, Xiang-Yang, additional, An, Zheng-Hua, additional, Song, Li-Ming, additional, Zheng, Shi-Jie, additional, Zhang, Fan, additional, Dong, Ai-Jun, additional, Xie, Wei, additional, Feng, Jian-Chao, additional, Ma, Qing-Bo, additional, Wang, De-Hua, additional, Luo, Xi-Hong, additional, Dang, Shi-Jun, additional, Shang, Lun-Hua, additional, Zhi, Qi-Jun, additional, and Li, Ti-Pei, additional

Published
2023
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6. First discovery of quasi-periodic oscillations in the dwarf nova HS 2325+8205 based on TESS photometry.

Author

Sun, Qi-Bin, Qian, Sheng-Bang, Zhu, Li-Ying, Dong, Ai-Jun, Zhi, Qi-Jun, Liao, Wen-Ping, Zhao, Er-Gang, Han, Zhong-Tao, Liu, Wei, Zang, Lei, Li, Fu-Xing, and Shi, Xiang-Dong

Subjects
DWARF novae, CATACLYSMIC variable stars, PHOTOMETRY, OSCILLATIONS, LIGHT curves, WAVELET transforms
Abstract

HS 2325+8205 is a long-period eclipsing dwarf nova with an orbital period above the period gap (P orb > 3 h) and is reported to be a Z Cam-type dwarf nova. We study the light variation and the quasi-periodic oscillations (QPOs) of HS 2325+8205 based on the photometry of the Transiting Exoplanet Survey Satellite (TESS). Using a continuous wavelet transform, a Lomb–Scargle periodogram (LSP), and sine fitting methods, we find for the first time that there is a QPO of ∼2160 s in the long outburst top light curves of HS 2325+8205. Moreover, we find that the oscillation intensity of the QPOs of HS 2325+8205 is related to the orbital phase, and the intensity in orbital phases 0.5–0.9 is stronger than in orbital phases 0.1–0.5. Therefore, the relationship between the oscillation intensity of QPOs and the orbital phase may become a topic of research into the origin of QPOs. In addition, we use the LSP to correct the orbital period of HS 2325+8205 to 0.19433475(6) d. [ABSTRACT FROM AUTHOR]

Published
2023
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