Monitoring Observations of SMC X-1's Excursions (MOOSE) III: X-ray Spectroscopy of a Warped, Precessing Accretion Disc
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913560027725824 |
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| author | Karam, Rawan Dage, Kristen C. Tetarenko, Bailey E. Brumback, McKinley C. Haggard, Daryl Bahramian, Arash Hu, Chin-Ping Neilsen, Joey Altamirano, Diego Athukoralalage, Wasundara Charles, Philip A. Clarkson, William I. Hickox, Ryan C. Kennea, Jamie |
| author_facet | Karam, Rawan Dage, Kristen C. Tetarenko, Bailey E. Brumback, McKinley C. Haggard, Daryl Bahramian, Arash Hu, Chin-Ping Neilsen, Joey Altamirano, Diego Athukoralalage, Wasundara Charles, Philip A. Clarkson, William I. Hickox, Ryan C. Kennea, Jamie |
| contents | The MOOSE (Monitoring Observations of SMC X-1 Excursions) program uses the Neutron Star Interior Composition Explorer Mission (NICER) to monitor the high mass X-ray binary SMC X-1 during its superorbital period excursions. Here we perform X-ray spectral analyses of 26 NICER observations of SMC X-1, taken at the tail-end of the excursion between 2021-04-01 and 2022-01-05. We use a single spectral model to fit spectra observed in high, intermediate and low states, using a combination of a partial covering fraction model, a black-body disc, and a power-law component. We find that the partial covering fraction varies significantly with the superorbital state during superorbital excursion. Our findings suggest that the low/high state in SMC X-1 is caused by a very high obscuration of the accretion disk. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_17307 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Monitoring Observations of SMC X-1's Excursions (MOOSE) III: X-ray Spectroscopy of a Warped, Precessing Accretion Disc Karam, Rawan Dage, Kristen C. Tetarenko, Bailey E. Brumback, McKinley C. Haggard, Daryl Bahramian, Arash Hu, Chin-Ping Neilsen, Joey Altamirano, Diego Athukoralalage, Wasundara Charles, Philip A. Clarkson, William I. Hickox, Ryan C. Kennea, Jamie High Energy Astrophysical Phenomena The MOOSE (Monitoring Observations of SMC X-1 Excursions) program uses the Neutron Star Interior Composition Explorer Mission (NICER) to monitor the high mass X-ray binary SMC X-1 during its superorbital period excursions. Here we perform X-ray spectral analyses of 26 NICER observations of SMC X-1, taken at the tail-end of the excursion between 2021-04-01 and 2022-01-05. We use a single spectral model to fit spectra observed in high, intermediate and low states, using a combination of a partial covering fraction model, a black-body disc, and a power-law component. We find that the partial covering fraction varies significantly with the superorbital state during superorbital excursion. Our findings suggest that the low/high state in SMC X-1 is caused by a very high obscuration of the accretion disk. |
| title | Monitoring Observations of SMC X-1's Excursions (MOOSE) III: X-ray Spectroscopy of a Warped, Precessing Accretion Disc |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2410.17307 |