The first confirmed periodically varying 6.031 and 6.035 GHz hydroxyl masers are reported here. They vary contemporaneously with the 6.7 GHz methanol masers in G323.459–0.079. The 1.665 GHz hydroxyl and 12.2 GHz methanol masers associated with G323.459–0.079 are also periodic. Evidence for periodicity is seen in all features in all transitions save a single 1.665 GHz hydroxyl maser feature. Historical excited-state hydroxyl maser observations set a stricter upper limit on the epoch in which a significant accretion event occurred. The associated burst in 6.7 GHz methanol maser activity has subsided significantly while the hydroxyl transitions are brightening possibly the result of changing physical conditions in the masing cloudlets. Time lags in methanol are confirmed and may be the result of the periodic flaring propagating outward from the central region of maser activity. A possible magnetic field reversal occurred during the accretion event.

中文翻译：

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G323.459-0.079 中多条 OH 和 CH3OH 线的同步周期性脉泽耀斑

这里报告了第一个确认的周期性变化的 6.031 和 6.035 GHz 羟基脉泽。它们与 G323.459–0.079 中的 6.7 GHz 甲醇微波激射器同时发生变化。与 G323.459–0.079 相关的 1.665 GHz 羟基和 12.2 GHz 甲醇脉泽也是周期性的。在所有跃迁的所有特征中都可以看到周期性的证据，除了一个 1.665 GHz 羟基脉泽特征。历史上的激发态羟基脉泽观测对发生显着吸积事件的时期设定了更严格的上限。6.7 GHz 甲醇微波激射活动的相关爆发已显着减弱，而羟基跃迁正在变亮，这可能是由于微波激射云中物理条件变化的结果。甲醇中的时间滞后得到证实，可能是从脉泽活动中心区域向外传播的周期性燃烧的结果。在吸积事件期间发生了可能的磁场反转。