Multistructured accretion flow of Sgr A* I: Examination of a RIAF model
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| _version_ | 1866917700146561024 |
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| author | Balakrishnan, Mayura Corrales, Lia Markoff, Sera Nowak, Michael Haggard, Daryl Wang, Q. Daniel Neilsen, Joey Russell, Christopher M. P. Calderón, Diego Cuadra, Jorge Baganoff, Fred |
| author_facet | Balakrishnan, Mayura Corrales, Lia Markoff, Sera Nowak, Michael Haggard, Daryl Wang, Q. Daniel Neilsen, Joey Russell, Christopher M. P. Calderón, Diego Cuadra, Jorge Baganoff, Fred |
| contents | The extreme low-luminosity supermassive black hole Sgr A* provides a unique laboratory in which to test radiatively inefficient accretion flow (RIAF) models. Previous fits to the quiescent Chandra ACIS-S spectrum found a RIAF model with an equal inflow-outflow balance works well. In this work, we apply the RIAF model to the Chandra HETG-S spectrum obtained through the Chandra X-ray Visionary Program, which displays features suggestive of temperature and velocity structures within the plasma. A comprehensive forward model analysis accounting for the accretion flow geometry and HETG-S instrumental effects is required for a full interpretation of the quiescent Chandra HETG-S spectrum. We present a RIAF model that takes these effects into account. Our fits to the high-resolution gratings spectrum indicate an inflow balanced by an outflow ($s \sim 1$) alongside a temperature profile that appears shallower than what would be expected from a gravitational potential following $1/r$. The data require that the abundance of Iron relative to solar is $Z_{Fe} < 0.32 Z_\odot$ (90\% credible interval), much lower than the $2~Z_\odot$ metallicity measured in nearby late-type giants. While future missions like NewAthena will provide higher spectral resolution, source separation will continue to be a problem. Leveraging Chandra's unparalleled spatial resolution, which is not expected to be surpassed for decades, remains essential for detailed investigations of the densely populated Galactic Center in X-rays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_14630 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multistructured accretion flow of Sgr A* I: Examination of a RIAF model Balakrishnan, Mayura Corrales, Lia Markoff, Sera Nowak, Michael Haggard, Daryl Wang, Q. Daniel Neilsen, Joey Russell, Christopher M. P. Calderón, Diego Cuadra, Jorge Baganoff, Fred High Energy Astrophysical Phenomena The extreme low-luminosity supermassive black hole Sgr A* provides a unique laboratory in which to test radiatively inefficient accretion flow (RIAF) models. Previous fits to the quiescent Chandra ACIS-S spectrum found a RIAF model with an equal inflow-outflow balance works well. In this work, we apply the RIAF model to the Chandra HETG-S spectrum obtained through the Chandra X-ray Visionary Program, which displays features suggestive of temperature and velocity structures within the plasma. A comprehensive forward model analysis accounting for the accretion flow geometry and HETG-S instrumental effects is required for a full interpretation of the quiescent Chandra HETG-S spectrum. We present a RIAF model that takes these effects into account. Our fits to the high-resolution gratings spectrum indicate an inflow balanced by an outflow ($s \sim 1$) alongside a temperature profile that appears shallower than what would be expected from a gravitational potential following $1/r$. The data require that the abundance of Iron relative to solar is $Z_{Fe} < 0.32 Z_\odot$ (90\% credible interval), much lower than the $2~Z_\odot$ metallicity measured in nearby late-type giants. While future missions like NewAthena will provide higher spectral resolution, source separation will continue to be a problem. Leveraging Chandra's unparalleled spatial resolution, which is not expected to be surpassed for decades, remains essential for detailed investigations of the densely populated Galactic Center in X-rays. |
| title | Multistructured accretion flow of Sgr A* I: Examination of a RIAF model |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2406.14630 |