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首页> 外文期刊>Astrophysics and space science >Broad-band spectral evolution and temporal variability of IGR J17091-3624 during its 2016 outburst: SWIFT and NuSTAR results
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Broad-band spectral evolution and temporal variability of IGR J17091-3624 during its 2016 outburst: SWIFT and NuSTAR results

机译：IGR J17091-3624在2016年突出期间的宽带谱演化与时间变异性：<重点类型=“斜体”> SWIFT 和<重点类型=“斜体”> NUSTAR 结果

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摘要

We report on the 2016 outburst of the transient Galactic Black Hole candidate IGR J17091-3624 based on the observation campaign carried out with SWIFT and NuSTAR . The outburst profile, as observed with SWIFT-XRT , shows a typical ‘q’-shape in the Hardness Intensity Diagram (HID). Based on the spectral and temporal evolution of the different parameters, we are able to identify all the spectral states in the q-profile of HID and the Hardness-RMS diagram (HRD). Both XRT and NuSTAR observations show an evolution of low frequency Quasi periodic oscillations (QPOs) during the low hard and hard intermediate states of the outburst rising phase. We also find mHz QPOs along-with distinct coherent class variabilities (heartbeat oscillations) with different timescales, similar to the ρ $ho $ -class (observed in GRS 1915+105). Phenomenological modelling of the broad-band XRT and NuSTAR spectra also reveals the evolution of high energy cut-off and presence of reflection from ionized material during the rising phase of the outburst. Further, we conduct the modelling of X-ray spectra of SWIFT and NuSTAR in 0.5–79?keV to understand the accretion flow dynamics based on two component flow model. From this modelling, we constrain the mass of the source to be in the range of 10.62 – 12.33 M ⊙ $10.62mbox{--}12.33~mbox{M}_{odot }$ with 90% confidence, which is consistent with earlier findings.
机译：我们在2016年突出的瞬态银行黑洞候选IGRJ17091-3624的爆发基于与SWIFT和NUSTAR开展的观察活动。用SWIFT-XRT观察到的突出概况在硬度强度图（HID）中显示了典型的'Q'形。基于不同参数的光谱和时间演进，我们能够识别HID和硬度-RMS图（HRD）的Q-剖面中的所有光谱状态。 XRT和Nustar观察均显示出在突出上升阶段的低硬质和硬中间状态期间低频准周期振荡（QPOS）的演变。我们还发现了MHz ​​QPO，具有不同的连贯的类别变量（心跳振荡），具有不同的时间尺度，类似于ρ$ rho $-class（在GRS 1915 + 105中观察到）。宽带XRT和NUSTAR光谱的现象学建模还揭示了在爆发的上升期间的高能截止和从电离材料的反射的演变。此外，我们在0.5-79中进行斯威夫特和NUSTAR的X射线光谱的建模？KEV以了解基于两个分量流模型的吸收流动力学。从这种建模中，我们将源的质量限制在10.62 - 12.33 m⊙$ 10.62 mbox { - } 12.33〜 mbox {m} _ { oad} $ 90％的信心，这是一致的随着早期的调查结果。

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