DISCOVERY OF A 7 mHz X-RAY QUASI-PERIODIC OSCILLATION FROM THE MOST MASSIVE STELLAR-MASS BLACK HOLE IC 10 X-1
DISCOVERY OF A 7 mHz X-RAY QUASI-PERIODIC OSCILLATION FROM THE MOST MASSIVE STELLAR-MASS BLACK HOLE IC 10 X-1
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发现来自最大质量恒星质量黑洞 IC 10 X-1 的 7 mHz X 射线准周期振荡
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Mushotzky
中科院分区：
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作者：
D. Pasham;T. Strohmayer;R. Mushotzky
我们报告了使用 XMM-Newton 从食高倾角黑洞双星 IC 10 X-1 中发现的约 7 mHz X 射线（0.3–10.0 keV）准周期振荡（QPO）。 QPO 在 >4.33σ 置信水平下显着，并且具有分数幅度 (% rms) 和品质因数 Q ≠ ν/Δν，分别为 ≈11 和 4。频率范围 0.0001–0.1 Hz 内的整体 X 射线 (0.3–10.0 keV) 功率谱可以通过指数为 ≈ − 2 的幂律和 7 mHz 的 QPO 来描述。在频率 ≳0.02 Hz 时，没有证据表明存在显着的变化。 QPO 的分数振幅 (rms) 在 0.3–1.5 keV 的能量范围内大致与能量无关。高于 1.5 keV 时，数据的低信噪比不允许我们检测到 QPO。通过直接将这些属性与目前已知的吸积黑洞和中子星的各种 QPO 进行比较，我们认为 IC 10 X-1 的 7 mHz QPO 可能与以下三类 QPO 之一相关：（1）黑洞源 GRS 1915+105 和 IGR J17091−3624 的“心跳”mHz QPO，或（2）高倾角中子星系统的 0.6–2.4 Hz“北斗 QPO”，或 (3) Cygnus X-3 的 mHz QPO。
We report the discovery with XMM-Newton of an ≈7 mHz X-ray (0.3–10.0 keV) quasi-periodic oscillation (QPO) from the eclipsing, high-inclination black hole binary IC 10 X-1. The QPO is significant at >4.33σ confidence level and has a fractional amplitude (% rms) and a quality factor, Q ≡ ν/Δν, of ≈11 and 4, respectively. The overall X-ray (0.3–10.0 keV) power spectrum in the frequency range 0.0001–0.1 Hz can be described by a power-law with an index of ≈ − 2, and a QPO at 7 mHz. At frequencies ≳0.02 Hz there is no evidence for significant variability. The fractional amplitude (rms) of the QPO is roughly energy-independent in the energy range of 0.3–1.5 keV. Above 1.5 keV the low signal-to-noise ratio of the data does not allow us to detect the QPO. By directly comparing these properties with the wide range of QPOs currently known from accreting black hole and neutron stars, we suggest that the 7 mHz QPO of IC 10 X-1 may be linked to one of the following three categories of QPOs: (1) the “heartbeat” mHz QPOs of the black hole sources GRS 1915+105 and IGR J17091−3624, or (2) the 0.6–2.4 Hz “dipper QPOs” of high-inclination neutron star systems, or (3) the mHz QPOs of Cygnus X-3.