Estimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMT
We constrain the spin of the black hole candidate MAXI J1727-203 using Insight-HXMT data. Due to limited Insight-HXMT observations covering only part of the outburst, NICER data were used to analyze the full outburst’s state transitions; we identified two of three HXMT observations in the high soft...
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IOP Publishing
2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/adae8b |
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| author | Haifan Zhu Wei Wang |
| author_facet | Haifan Zhu Wei Wang |
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| collection | DOAJ |
| description | We constrain the spin of the black hole candidate MAXI J1727-203 using Insight-HXMT data. Due to limited Insight-HXMT observations covering only part of the outburst, NICER data were used to analyze the full outburst’s state transitions; we identified two of three HXMT observations in the high soft state and applied the continuum-fitting method to measure the spin. Based on previous estimates and continuum spectral fittings, we explored the parameter space and found that the best-fitting values were ( D , i , M ) ≈ (6 kpc, 30°, 12 M _⊙ ). We also tested the variation of these parameters using Monte Carlo simulations, sampling over 3000 sets within the parameter ranges 5.9 kpc < D < 7 kpc, 24° < i < 35°, and 10 M _⊙ < M < 14 M _⊙ , yielding a spin measurement of $a=0.3{4}_{-0.19}^{+0.15}$ (1 σ ). In addition, we analyzed NuSTAR data in the low hard state and found a good fit with the tbabs∗(diskbb+powerlaw) model, with no significant iron line features observed in the residuals; therefore, the previous reflection model results suggesting an extremely high spin overestimates the black hole spin. |
| format | Article |
| id | doaj-art-bc28a3108d0d4ea29fda1f6f9606dc35 |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| spelling | doaj-art-bc28a3108d0d4ea29fda1f6f9606dc352025-08-20T02:43:49ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980223710.3847/1538-4357/adae8bEstimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMTHaifan Zhu0https://orcid.org/0000-0002-4858-3001Wei Wang1https://orcid.org/0000-0003-3901-8403Department of Astronomy, School of Physics and Technology, Wuhan University , Wuhan 430072, People’s Republic of China ; wangwei2017@whu.edu.cnDepartment of Astronomy, School of Physics and Technology, Wuhan University , Wuhan 430072, People’s Republic of China ; wangwei2017@whu.edu.cnWe constrain the spin of the black hole candidate MAXI J1727-203 using Insight-HXMT data. Due to limited Insight-HXMT observations covering only part of the outburst, NICER data were used to analyze the full outburst’s state transitions; we identified two of three HXMT observations in the high soft state and applied the continuum-fitting method to measure the spin. Based on previous estimates and continuum spectral fittings, we explored the parameter space and found that the best-fitting values were ( D , i , M ) ≈ (6 kpc, 30°, 12 M _⊙ ). We also tested the variation of these parameters using Monte Carlo simulations, sampling over 3000 sets within the parameter ranges 5.9 kpc < D < 7 kpc, 24° < i < 35°, and 10 M _⊙ < M < 14 M _⊙ , yielding a spin measurement of $a=0.3{4}_{-0.19}^{+0.15}$ (1 σ ). In addition, we analyzed NuSTAR data in the low hard state and found a good fit with the tbabs∗(diskbb+powerlaw) model, with no significant iron line features observed in the residuals; therefore, the previous reflection model results suggesting an extremely high spin overestimates the black hole spin.https://doi.org/10.3847/1538-4357/adae8bBlack hole physicsStellar accretion disksKerr black holesX-ray binary starsHigh energy astrophysics |
| spellingShingle | Haifan Zhu Wei Wang Estimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMT The Astrophysical Journal Black hole physics Stellar accretion disks Kerr black holes X-ray binary stars High energy astrophysics |
| title | Estimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMT |
| title_full | Estimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMT |
| title_fullStr | Estimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMT |
| title_full_unstemmed | Estimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMT |
| title_short | Estimating the Black Hole Spin for the X-Ray Binary MAXI J1727-203 Based on Insight-HXMT |
| title_sort | estimating the black hole spin for the x ray binary maxi j1727 203 based on insight hxmt |
| topic | Black hole physics Stellar accretion disks Kerr black holes X-ray binary stars High energy astrophysics |
| url | https://doi.org/10.3847/1538-4357/adae8b |
| work_keys_str_mv | AT haifanzhu estimatingtheblackholespinforthexraybinarymaxij1727203basedoninsighthxmt AT weiwang estimatingtheblackholespinforthexraybinarymaxij1727203basedoninsighthxmt |