Discovery of periodic methanol masers associated with G323.46−0.08
Discovery of periodic methanol masers associated with G323.46−0.08
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DOI：
10.1093/mnras/stz1458
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发表时间：
2019-05
影响因子：
4.8
通讯作者：
E. Proven-Adzri;G. MacLeod;S. V. D. Heever;M. Hoare;A. Kuditcher;S. Goedhart
中科院分区：
文献类型：
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作者：
E. Proven-Adzri;G. MacLeod;S. V. D. Heever;M. Hoare;A. Kuditcher;S. Goedhart
与 G323.46 − 0.08 相关的 6.7 GHz 甲醇微波激射器自 1992 年发现以来已经发生了重大变化。2009 年 4 月之后，在速度通道 v = − 68.35 km s − 1 中检测到峰值通量密度为 ∼ 500 Jy 的新特征，速度范围为 − 71 至 − 68.5 km s − 1 。这表明它经历了与 S255-NIRS3 和 NGC 6334I 中报道的类似的吸积事件。在所有相关的甲醇脉泽中都发现了周期性的证据，周期约为 93.5 天。无法确定该源在 2017 年之前是否是周期性的。但是，所有 6.7 GHz 甲醇微波激射器可能都在放大共同的背景周期性无线电源。
The 6.7 GHz methanol masers associated with G323.46 − 0.08 have undergone significant change since their discovery in 1992. After 2009 April, new features with a peak flux density of ∼ 500 Jy in the velocity channel v = − 68.35 km s − 1 , in the velocity range from − 71 to − 68.5 km s − 1 were detected. It is suggestive that it experienced an accretion event similar to that reported in S255-NIRS3 and NGC 6334I. Evidence of periodicity is found in all of the associated methanol masers with a period of ∼ 93.5 d. It is not possible to determine if this source was periodic before 2017. However, all the 6.7 GHz methanol masers are probably amplifying a common background periodic radio source.