A comprehensive study of type I (thermonuclear) bursts in the new transient SRGA J144459.2$-$604207
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arXiv
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| Autori principali: | , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Fu, Tao Li, Zhaosheng Pan, Yuanyue Ji, Long Chen, Yupeng Kuiper, Lucien Galloway, Duncan K. Falanga, Maurizio Xu, Renxin Li, Xiaobo Ge, Mingyu Song, L. M. Zhang, Shu Zhang, Shuang-Nan |
| author_facet | Fu, Tao Li, Zhaosheng Pan, Yuanyue Ji, Long Chen, Yupeng Kuiper, Lucien Galloway, Duncan K. Falanga, Maurizio Xu, Renxin Li, Xiaobo Ge, Mingyu Song, L. M. Zhang, Shu Zhang, Shuang-Nan |
| contents | We report an analysis of Insight-HXMT observations of the newly discovered accreting millisecond pulsar SRGA J144459.2$-$604207. During the outburst, detected in 2024 February by SRG/ART-XC, the broadband persistent spectrum was well fitted by an absorbed Comptonization model. We detected 60 type I X-ray bursts in the Insight-HXMT medium energy (ME) data, and 37 were also detected with the low-energy (LE) telescope. By superimposing the Insight-HXMT/LE/ME/HE light curves of 37 bursts with similar profiles and intensities, we measured a deficit of X-rays in the $40-70$ keV energy band. By analyzing the time-resolved X-ray burst spectra, we determine the mean ratio of persistent to burst flux of $α=71\pm7$. We estimate the average hydrogen mass fraction in the fuel at ignition, as $\bar{X} =0.342\pm0.033$, and constrain the burst fuel composition as $X_0\leq0.4$. We found that 14 out of 60 X-ray bursts exhibited photospheric expansion, and thus we estimated the distance to the source as $10.0\pm0.71$ kpc. Combined with IXPE observations, the burst recurrence time increased from 1.55 to 8 hr as the local mass accretion rate decreased, which can be described as $ΔT_{\rm rec}\sim \dot{m}^{-0.91\pm0.02}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_05779 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A comprehensive study of type I (thermonuclear) bursts in the new transient SRGA J144459.2$-$604207 Fu, Tao Li, Zhaosheng Pan, Yuanyue Ji, Long Chen, Yupeng Kuiper, Lucien Galloway, Duncan K. Falanga, Maurizio Xu, Renxin Li, Xiaobo Ge, Mingyu Song, L. M. Zhang, Shu Zhang, Shuang-Nan High Energy Astrophysical Phenomena We report an analysis of Insight-HXMT observations of the newly discovered accreting millisecond pulsar SRGA J144459.2$-$604207. During the outburst, detected in 2024 February by SRG/ART-XC, the broadband persistent spectrum was well fitted by an absorbed Comptonization model. We detected 60 type I X-ray bursts in the Insight-HXMT medium energy (ME) data, and 37 were also detected with the low-energy (LE) telescope. By superimposing the Insight-HXMT/LE/ME/HE light curves of 37 bursts with similar profiles and intensities, we measured a deficit of X-rays in the $40-70$ keV energy band. By analyzing the time-resolved X-ray burst spectra, we determine the mean ratio of persistent to burst flux of $α=71\pm7$. We estimate the average hydrogen mass fraction in the fuel at ignition, as $\bar{X} =0.342\pm0.033$, and constrain the burst fuel composition as $X_0\leq0.4$. We found that 14 out of 60 X-ray bursts exhibited photospheric expansion, and thus we estimated the distance to the source as $10.0\pm0.71$ kpc. Combined with IXPE observations, the burst recurrence time increased from 1.55 to 8 hr as the local mass accretion rate decreased, which can be described as $ΔT_{\rm rec}\sim \dot{m}^{-0.91\pm0.02}$. |
| title | A comprehensive study of type I (thermonuclear) bursts in the new transient SRGA J144459.2$-$604207 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2412.05779 |