Detection of multiple X-ray quasi-periodic oscillations in IGR J19294+1816 with Insight-HXMT
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2025
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| author | Yang, Wen Wang, Wei |
| author_facet | Yang, Wen Wang, Wei |
| contents | We report the timing results with Insight-HXMT observations of X-ray binary IGR J19294+1816 during its 2019 Type I outburst at the decline phase shortly following its peak. We analyze the light curves and power density spectrum (PDS) of the 2019 observations and reveal a peak at approximately $ν_{NS} \sim 80.2$ mHz, corresponding to X-ray pulsations from the neutron star. In addition, a significant quasi-periodic oscillation (QPO) feature is observed at around $ν_{QPO} \sim 30.2$ mHz from 10-50 keV, with the rms amplitude increasing with energy. Furthermore, we detect two QPOs at the frequency of $\sim 51.1$ mHz and $113.7$ mHz (corresponding to sidebands near $ν_{NS} \pm ν_{QPO}$) in 25-50 keV, exhibiting an rms amplitude of around 12$\%$. Wavelet analysis also shows multiple QPOs at the frequency of $\sim 30$ mHz, $50$ mHz and $ 110$ mHz and these QPO features show transient behaviors, the centroid frequencies of $\sim 30$ mHz remain nearly constant for different luminosities. Our research identifies IGR J19294+1816 as the second strong magnetic-field pulsar with significant sideband signals around the spin frequency. We explore various physical origins that could explain the presence of multiple QPOs. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_05771 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Detection of multiple X-ray quasi-periodic oscillations in IGR J19294+1816 with Insight-HXMT Yang, Wen Wang, Wei High Energy Astrophysical Phenomena Solar and Stellar Astrophysics High Energy Physics - Phenomenology We report the timing results with Insight-HXMT observations of X-ray binary IGR J19294+1816 during its 2019 Type I outburst at the decline phase shortly following its peak. We analyze the light curves and power density spectrum (PDS) of the 2019 observations and reveal a peak at approximately $ν_{NS} \sim 80.2$ mHz, corresponding to X-ray pulsations from the neutron star. In addition, a significant quasi-periodic oscillation (QPO) feature is observed at around $ν_{QPO} \sim 30.2$ mHz from 10-50 keV, with the rms amplitude increasing with energy. Furthermore, we detect two QPOs at the frequency of $\sim 51.1$ mHz and $113.7$ mHz (corresponding to sidebands near $ν_{NS} \pm ν_{QPO}$) in 25-50 keV, exhibiting an rms amplitude of around 12$\%$. Wavelet analysis also shows multiple QPOs at the frequency of $\sim 30$ mHz, $50$ mHz and $ 110$ mHz and these QPO features show transient behaviors, the centroid frequencies of $\sim 30$ mHz remain nearly constant for different luminosities. Our research identifies IGR J19294+1816 as the second strong magnetic-field pulsar with significant sideband signals around the spin frequency. We explore various physical origins that could explain the presence of multiple QPOs. |
| title | Detection of multiple X-ray quasi-periodic oscillations in IGR J19294+1816 with Insight-HXMT |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2506.05771 |