Spectral Analysis of the 2019 and 2022 Outbursts of SAX J1808.4-3658
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914231061839872 |
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| author | Bruce, Katherine Tsuruta, Sachiko Liebmann, Andrew C. Teter, Marcus |
| author_facet | Bruce, Katherine Tsuruta, Sachiko Liebmann, Andrew C. Teter, Marcus |
| contents | The accreting millisecond pulsar SAX J1808.4-3658 went into outburst from July to November in 2019 and August to October in 2022, which were observed by \textit{NICER} and \textit{NuSTAR}. In this paper, we first present the light curve for both outbursts using \textit{NICER} data. Several thermonuclear bursts occurred during these outbursts. We analyze the evolution of the spectra of two thermonuclear bursts that took place during the 2019 \textit{NuSTAR} observation. We proceed by analyzing the combined broad-band spectrum using \textit{NICER} and \textit{NuSTAR} for the first time for this source. We jointly modeled the combined quiescent spectra of both outbursts with a self-consistent reflection component. In our best-fit model, we find evidence of reflection, consistently constrain the inclination to 72°$^{+1°}_{-4°}$\, considering this reflection, and identify a 1 keV feature during persistent emission. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00977 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spectral Analysis of the 2019 and 2022 Outbursts of SAX J1808.4-3658 Bruce, Katherine Tsuruta, Sachiko Liebmann, Andrew C. Teter, Marcus High Energy Astrophysical Phenomena The accreting millisecond pulsar SAX J1808.4-3658 went into outburst from July to November in 2019 and August to October in 2022, which were observed by \textit{NICER} and \textit{NuSTAR}. In this paper, we first present the light curve for both outbursts using \textit{NICER} data. Several thermonuclear bursts occurred during these outbursts. We analyze the evolution of the spectra of two thermonuclear bursts that took place during the 2019 \textit{NuSTAR} observation. We proceed by analyzing the combined broad-band spectrum using \textit{NICER} and \textit{NuSTAR} for the first time for this source. We jointly modeled the combined quiescent spectra of both outbursts with a self-consistent reflection component. In our best-fit model, we find evidence of reflection, consistently constrain the inclination to 72°$^{+1°}_{-4°}$\, considering this reflection, and identify a 1 keV feature during persistent emission. |
| title | Spectral Analysis of the 2019 and 2022 Outbursts of SAX J1808.4-3658 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.00977 |