A Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207
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-...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/adadee |
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| author | Tao Fu Zhaosheng Li Yuanyue Pan Long Ji Yupeng Chen Lucien Kuiper Duncan K. Galloway Maurizio Falanga Renxin Xu Xiaobo Li Mingyu Ge L. M. Song Shu Zhang Shuang-Nan Zhang |
| author_facet | Tao Fu Zhaosheng Li Yuanyue Pan Long Ji Yupeng Chen Lucien Kuiper Duncan K. Galloway Maurizio Falanga Renxin Xu Xiaobo Li Mingyu Ge L. M. Song Shu Zhang Shuang-Nan Zhang |
| author_sort | Tao Fu |
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| description | 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 ± 7. We estimate the average hydrogen mass fraction in the fuel at ignition, as $\overline{X}=0.342\pm 0.033$ , and constrain the burst fuel composition as X _0 ≲ 0.4. We found that 14 out of 60 X-ray bursts exhibited photospheric expansion, and thus we estimated the distance to the source as 10.03 ± 0.71 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 ${\rm{\Delta }}{T}_{{\rm{rec}}}\sim {\dot{m}}^{-0.91\pm 0.02}$ . |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-e874ad201ef64927b2a7cce80b826fd62025-02-12T07:04:49ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980216110.3847/1538-4357/adadeeA Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207Tao Fu0Zhaosheng Li1https://orcid.org/0000-0003-2310-8105Yuanyue Pan2Long Ji3https://orcid.org/0000-0001-9599-7285Yupeng Chen4https://orcid.org/0000-0001-8768-3294Lucien Kuiper5https://orcid.org/0000-0002-7889-6586Duncan K. Galloway6https://orcid.org/0000-0002-6558-5121Maurizio Falanga7https://orcid.org/0000-0003-3095-6065Renxin Xu8https://orcid.org/0000-0002-9042-3044Xiaobo Li9Mingyu Ge10https://orcid.org/0000-0002-3776-4536L. M. Song11https://orcid.org/0000-0003-0274-3396Shu Zhang12Shuang-Nan Zhang13https://orcid.org/0000-0001-5586-1017Key Laboratory of Stars and Interstellar Medium, Xiangtan University , Xiangtan 411105, Hunan, People’s Republic of China ; lizhaosheng@xtu.edu.cn, panyy@xtu.edu.cnKey Laboratory of Stars and Interstellar Medium, Xiangtan University , Xiangtan 411105, Hunan, People’s Republic of China ; lizhaosheng@xtu.edu.cn, panyy@xtu.edu.cnKey Laboratory of Stars and Interstellar Medium, Xiangtan University , Xiangtan 411105, Hunan, People’s Republic of China ; lizhaosheng@xtu.edu.cn, panyy@xtu.edu.cnSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of ChinaSRON-Netherlands Institute for Space Research , Niels Bohrweg 4, 2333 CA, Leiden, The NetherlandsSchool of Physics and Astronomy, Monash University , Victoria 3800, Australia; Institute for Globally Distributed Open Research and Education (IGDORE) , SwedenInternational Space Science Institute (ISSI) , Hallerstrasse 6, 3012 Bern, Switzerland; Physikalisches Institut, University of Bern , Sidlerstrasse 5, 3012 Bern, SwitzerlandDepartment of Astronomy, School of Physics, Peking University , Beijing 100871, People’s Republic of China; Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People’s Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of ChinaKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049, People’s Republic of ChinaWe 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 ± 7. We estimate the average hydrogen mass fraction in the fuel at ignition, as $\overline{X}=0.342\pm 0.033$ , and constrain the burst fuel composition as X _0 ≲ 0.4. We found that 14 out of 60 X-ray bursts exhibited photospheric expansion, and thus we estimated the distance to the source as 10.03 ± 0.71 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 ${\rm{\Delta }}{T}_{{\rm{rec}}}\sim {\dot{m}}^{-0.91\pm 0.02}$ .https://doi.org/10.3847/1538-4357/adadeeLow-mass x-ray binary starsX-ray bursters |
| spellingShingle | Tao Fu Zhaosheng Li Yuanyue Pan Long Ji Yupeng Chen Lucien Kuiper Duncan K. Galloway Maurizio Falanga Renxin Xu Xiaobo Li Mingyu Ge L. M. Song Shu Zhang Shuang-Nan Zhang A Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207 The Astrophysical Journal Low-mass x-ray binary stars X-ray bursters |
| title | A Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207 |
| title_full | A Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207 |
| title_fullStr | A Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207 |
| title_full_unstemmed | A Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207 |
| title_short | A Comprehensive Study of Type I (Thermonuclear) Bursts in the New Transient SRGA J144459.2–604207 |
| title_sort | comprehensive study of type i thermonuclear bursts in the new transient srga j144459 2 604207 |
| topic | Low-mass x-ray binary stars X-ray bursters |
| url | https://doi.org/10.3847/1538-4357/adadee |
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