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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Time Lag in the Intra-Day Variability of SagittariusA~★ between Light Curves at 90 and 102GHz
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Time Lag in the Intra-Day Variability of SagittariusA~★ between Light Curves at 90 and 102GHz

机译：射手座A〜★在90和102GHz的光曲线之间的日内变异性存在时滞

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摘要

We performed observations of the flux densities of SgrA★ at 90 and 102 GHz in order to detect any time lag between these frequencies using the Nobeyama Millimeter Array, which was previously reported at lower frequencies. We detected a radio flare during the observation period on 2005 April 6, and calculated the z -transformed discrete correlation function between the light curves. No time lag between these frequencies was detected. If the expanding plasma model, which explains a time lag at lower frequencies, is valid, the light curve at 90 GHz would be delayed in respect to that at 102 GHz. This result suggests that plasma blobs ejected close to the Galactic center black hole may be widely diverse, especially in optical thickness. Another possibility is that a major portion of the flux above 100 GHz does not originate in blobs.
机译：我们使用Nobeyama毫米波阵列观察了SgrA★在90和102 GHz时的通量密度，以检测这些频率之间的任何时滞，而以前曾报道过这种频率在较低的频率下。我们在2005年4月6日的观测期内检测到了一次无线电耀斑，并计算了光曲线之间的z变换离散相关函数。在这些频率之间没有检测到时滞。如果解释了较低频率时滞的扩展等离子体模型有效，则90 GHz处的光曲线将相对于102 GHz处的光曲线延迟。该结果表明，靠近银河系中心黑洞喷出的等离子体斑点可能差异很大，尤其是在光学厚度方面。另一种可能性是，高于100 GHz的通量的大部分不会起源于斑点。

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