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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23?00.50
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The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23?00.50

机译：G 014.23？00.50中6.7 GHz处的甲醇maser发射的最短周期性和扩口通量变化

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摘要

We detected flaring flux variability that regularly occurred with a period of 23.9?d on a 6.7 GHz methanol maser emission at Vlsr = 25.30 km s?1 in G 014.23?00.50 through highly frequent monitoring using the Hitachi 32?m radio telescope. Analyzing data from 2013 January 5 to 2016 January 21, the periodic variability has persisted in at least 47 cycles, corresponding to ～1100?d. The period of 23.9?d is the shortest one observed in masers around high-mass young stellar objects so far. The flaring component normally falls below the detection limit (3?σ) of ～0.9?Jy. In the flaring periods, the component rises above the detection limit with a ratio of the peak flux density more than 180 in comparison with the quiescent phase, showing intermittent periodic variability. The timescale of the flux rise was typically two days or shorter, and both symmetric and asymmetric profiles of flux variability were observed through intraday monitoring. These characteristics might be explained by a change in the flux of seed photons in a colliding-wind binary (CWB) system, or a variation of the dust temperature by the extra heating source of a shock formed by a CWB system within a gap region in a circumbinary disk, in which the orbital semi-major axes of the binary are 0.26–0.34 au.
机译：我们通过使用日立32？m射电望远镜进行了频繁的监测，发现在G 014.23？00.50中Vlsr = 25.30 km s？1的情况下，在6.7 GHz甲醇maser发射上，周期为23.9？d的燃烧通量变化规律发生。分析2013年1月5日至2016年1月21日的数据，其周期性变化至少持续了47个周期，对应于〜1100？d。到目前为止，在大质量年轻恒星物体周围的激子中观测到的最短时间为23.9d。扩口分量通常会降至检测极限（3？σ）〜0.9？Jy以下。在扩口期间，与静止阶段相比，该组件以峰值通量密度的比率大于180的比率上升到检测极限以上，显示出间歇性的周期性变化。通量上升的时间尺度通常为两天或更短，并且通过日内监测可以观察到通量变化的对称和不对称分布。这些特征可以通过碰撞风二元（CWB）系统中种子光子通量的变化，或CWB系统在间隙区域内由CWB系统形成的额外的热源激振引起的粉尘温度变化来解释。圆盘，其中双星的轨道半长轴为0.26-0.34 au。

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