Evidence for a dynamic corona in the short-term time lags of black hole X-ray binary MAXI J1820+070
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arXiv
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| Natura: | Preprint |
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2023
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| _version_ | 1866916363608522752 |
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| author | Bollemeijer, Niek Uttley, Phil Basak, Arkadip Ingram, Adam Eijnden, Jakob van den Alabarta, Kevin Altamirano, Diego Arzoumanian, Zaven Buisson, Douglas J. K. Fabian, Andrew C. Ferrara, Elizabeth Gendreau, Keith Homan, Jeroen Kara, Erin Markwardt, Craig Remillard, Ronald A. Sanna, Andrea Steiner, James F. Tombesi, Francesco Wang, Jingyi Wang, Yanan Zoghbi, Abderahmen |
| author_facet | Bollemeijer, Niek Uttley, Phil Basak, Arkadip Ingram, Adam Eijnden, Jakob van den Alabarta, Kevin Altamirano, Diego Arzoumanian, Zaven Buisson, Douglas J. K. Fabian, Andrew C. Ferrara, Elizabeth Gendreau, Keith Homan, Jeroen Kara, Erin Markwardt, Craig Remillard, Ronald A. Sanna, Andrea Steiner, James F. Tombesi, Francesco Wang, Jingyi Wang, Yanan Zoghbi, Abderahmen |
| contents | In X-ray observations of hard state black hole X-ray binaries, rapid variations in accretion disc and coronal power-law emission are correlated and show Fourier-frequency-dependent time lags. On short (~0.1 s) time-scales, these lags are thought to be due to reverberation and therefore may depend strongly on the geometry of the corona. Low-frequency quasi-periodic oscillations (QPOs) are variations in X-ray flux that have been suggested to arise because of geometric changes in the corona, possibly due to General Relativistic Lense-Thirring precession. Therefore one might expect the short-term time lags to vary on the QPO time-scale. We performed novel spectral-timing analyses on NICER observations of the black hole X-ray binary MAXI J1820+070 during the hard state of its outburst in 2018 to investigate how the short-term time lags between a disc-dominated and a coronal power-law-dominated energy band vary on different time-scales. Our method can distinguish between variability due to the QPO and broadband noise, and we find a linear correlation between the power-law flux and lag amplitude that is strongest at the QPO frequency. We also introduce a new method to resolve the QPO signal and determine the QPO-phase-dependence of the flux and lag variations, finding that both are very similar. Our results are consistent with a geometric origin of QPOs, but also provide evidence for a dynamic corona with a geometry varying in a similar way over a broad range of time-scales, not just the QPO time-scale. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_09835 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Evidence for a dynamic corona in the short-term time lags of black hole X-ray binary MAXI J1820+070 Bollemeijer, Niek Uttley, Phil Basak, Arkadip Ingram, Adam Eijnden, Jakob van den Alabarta, Kevin Altamirano, Diego Arzoumanian, Zaven Buisson, Douglas J. K. Fabian, Andrew C. Ferrara, Elizabeth Gendreau, Keith Homan, Jeroen Kara, Erin Markwardt, Craig Remillard, Ronald A. Sanna, Andrea Steiner, James F. Tombesi, Francesco Wang, Jingyi Wang, Yanan Zoghbi, Abderahmen High Energy Astrophysical Phenomena In X-ray observations of hard state black hole X-ray binaries, rapid variations in accretion disc and coronal power-law emission are correlated and show Fourier-frequency-dependent time lags. On short (~0.1 s) time-scales, these lags are thought to be due to reverberation and therefore may depend strongly on the geometry of the corona. Low-frequency quasi-periodic oscillations (QPOs) are variations in X-ray flux that have been suggested to arise because of geometric changes in the corona, possibly due to General Relativistic Lense-Thirring precession. Therefore one might expect the short-term time lags to vary on the QPO time-scale. We performed novel spectral-timing analyses on NICER observations of the black hole X-ray binary MAXI J1820+070 during the hard state of its outburst in 2018 to investigate how the short-term time lags between a disc-dominated and a coronal power-law-dominated energy band vary on different time-scales. Our method can distinguish between variability due to the QPO and broadband noise, and we find a linear correlation between the power-law flux and lag amplitude that is strongest at the QPO frequency. We also introduce a new method to resolve the QPO signal and determine the QPO-phase-dependence of the flux and lag variations, finding that both are very similar. Our results are consistent with a geometric origin of QPOs, but also provide evidence for a dynamic corona with a geometry varying in a similar way over a broad range of time-scales, not just the QPO time-scale. |
| title | Evidence for a dynamic corona in the short-term time lags of black hole X-ray binary MAXI J1820+070 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2312.09835 |