Monitoring a methanol maser flare associated with the massive star-forming region G358.93-0.03
Monitoring a methanol maser flare associated with the massive star-forming region G358.93-0.03
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监测与大质量恒星形成区 G358.93-0.03 相关的甲醇脉泽耀斑
DOI：
10.1093/mnrasl/slaa036
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发表时间：
2020
影响因子：
--
通讯作者：
Sugiyama K. (6番目)
中科院分区：
文献类型：
--
作者：
Volvach A. E.;Volvach L. N.;Larionov M. G.;MacLeod G. C.;van den Heever S. P.;Sugiyama K. (6番目)
我们报道了与大质量恒星形成区G358.93-0.03有关的19.967-GHz [21- 30 E（t= 0）跃迁]甲醇脉泽的最早探测。2019年1月23日至3月5日可探测到耀斑，持续时间仅44 d。它被证明是整个观测历史上银河系中最强大的19.967-GHz脉泽，考虑到它在地球表面的104-Jy通量和到源的距离，6.75 kpc。19.967-GHz脉泽爆发的同时，在相关的20.971-GHz甲醇脉泽检测到的两个耀斑的第一。我们估计这两次跃迁的通量密度之比为F_（20.971）/F_（19.967）= 14 ± 4，在第二次耀斑中增大到>520。本文讨论了20.971-GHz甲醇脉泽中两个耀斑的差异及其后果。
We report the earliest detection of the 19.967-GHz [transition 21–30E(t= 0)] methanol maser associated with the massive star-forming region G358.93–0.03. The flare was detectable from 2019 January 23 to March 5, for only 44 d. It turned out to be the most powerful 19.967-GHz maser in the Galaxy in the entire history of observations, taking into account the 104-Jy flux from it on the Earth’s surface and the distance to the source, 6.75 kpc. The 19.967-GHz maser flared contemporaneously with the first of two flares detected in associated 20.971-GHz methanol masers. We estimated that the ratio of flux densities between these two transitions isF20.971/F19.967= 14 ± 4, increasing to >520 in the second flare. We discuss the differences between the two flares in the 20.971-GHz methanol masers and the consequence thereof.