On the optical emission in the mini-outburst of the black hole X-ray binary MAXI J1348-630
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866909975144562688 |
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| author | Fan, Xiao You, Bei Du, Dizhan He, Han Yang, Shuangkang |
| author_facet | Fan, Xiao You, Bei Du, Dizhan He, Han Yang, Shuangkang |
| contents | We investigate the optical emission of the black hole X-ray binary MAXI J1348-630 during its 2019 minioutburst. Using optical data from the Las Cumbres Observatory Global Telescope and X-ray data from Insight-HXMT, we performed time delay analysis, optical-X-ray correlation analysis, and spectral energy distribution (SED) fitting. Our key findings are as follows: (1) The X-ray Comptonization flux lags behind the optical emission by about 8.5 days, a delay naturally explained by the disk instability model (DIM). (2) The optical and X-ray fluxes show a power-law correlation with a slope about 0.4, which lies between the predicted values for viscous heating and X-ray reprocessing, consistent with the DIM framework. (3) SED fitting with the irradiated disk model successfully reproduces the quasi-simultaneous optical and X-ray data, and the contribution of the jet is negligible. Our results indicate that the optical emission during the mini-outburst originates from the disk, rather than the jet or hot accretion flow, and highlight the critical role of the DIM in understanding the mini-outburst of X-ray binaries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_19645 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the optical emission in the mini-outburst of the black hole X-ray binary MAXI J1348-630 Fan, Xiao You, Bei Du, Dizhan He, Han Yang, Shuangkang High Energy Astrophysical Phenomena We investigate the optical emission of the black hole X-ray binary MAXI J1348-630 during its 2019 minioutburst. Using optical data from the Las Cumbres Observatory Global Telescope and X-ray data from Insight-HXMT, we performed time delay analysis, optical-X-ray correlation analysis, and spectral energy distribution (SED) fitting. Our key findings are as follows: (1) The X-ray Comptonization flux lags behind the optical emission by about 8.5 days, a delay naturally explained by the disk instability model (DIM). (2) The optical and X-ray fluxes show a power-law correlation with a slope about 0.4, which lies between the predicted values for viscous heating and X-ray reprocessing, consistent with the DIM framework. (3) SED fitting with the irradiated disk model successfully reproduces the quasi-simultaneous optical and X-ray data, and the contribution of the jet is negligible. Our results indicate that the optical emission during the mini-outburst originates from the disk, rather than the jet or hot accretion flow, and highlight the critical role of the DIM in understanding the mini-outburst of X-ray binaries. |
| title | On the optical emission in the mini-outburst of the black hole X-ray binary MAXI J1348-630 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2508.19645 |