论文标题
Maxi J1535中的瞬态QPO的小波分析$ - $ 571与Insight-Hxmt
Wavelet analysis of the transient QPOs in MAXI J1535$-$571 with Insight-HXMT
论文作者
论文摘要
使用小波分析和功率密度谱，我们研究了在Maxi J1535 $ - $ 571中观察到的两个瞬时准周期振荡（QPO），该振荡与Insight-HXMT观察到。瞬态QPO的质心频率为$ \ sim 10 $ hz，带有FWHM $ \ sim 0.6 $ Hz和RMS振幅$ \ sim 14 \％$。 QPO和非QPO制度的能量光谱也被分离和分析，与QPO制度相比，非QPO制度中的$ e_ {cut} $变得更柔软。我们的结果表明，在MJD 58016和58017中检测到的瞬态QPO仍然是C型QPO，并且源保留在其HIM中。基于小波的所有类型C QPO信号的持续时间与高于$ \ sim 10 $ keV的平均计数率正相关，这意味着在不同的时间尺度上的外观应与电晕相结合。瞬态QPO性能可能与喷射或耀斑有关，也许电晕的部分弹射是造成C型QPO的消失的原因。
Using wavelet analysis and power density spectrum, we investigate two transient quasi-periodic oscillations (QPOs) observed in MAXI J1535$-$571 observed with Insight-HXMT. The transient QPOs have a centroid frequency of $\sim 10$ Hz with a FWHM $\sim 0.6$ Hz and an rms amplitude $\sim 14\%$. Energy spectra of QPO and non-QPO regimes are also separated and analyzed, and the spectra become softer with higher $E_{cut}$ in the non-QPO regime compared to the QPO regime. Our results suggest that the transient QPOs detected in MJD 58016 and 58017 are still the type-C QPO, and the source remains in its HIMS. The duration of all type-C QPO signals based on wavelet is positively correlated with the mean count rate above $\sim 10$ keV, implying appearance of QPOs in different time scales should be coupled with the corona. The transient QPO properties could be related to the jet or flares, perhaps the partial ejection of the corona is responsible for the disappearance of the type-C QPO.
