We present constraints on the dust continuum flux and inferred gas content of a gravitationally lensed massive quiescent galaxy at z = 1.883 0.001 using AzTEC 1.1 mm imaging with the Large Millimeter Telescope. MRG-S0851 appears to be a prototypical massive compact quiescent galaxy, but evidence suggests that it experienced a centrally concentrated rejuvenation event in the last 100 Myr. This galaxy is undetected in the AzTEC image but we calculate an upper limit on the millimeter flux and use this to estimate the H₂ mass limit via an empirically calibrated relation that assumes a constant molecular-gas-to-dust ratio of 150. We constrain the 3σ upper limit of the H₂ fraction from the dust continuum in MRG-S0851 to be . MRG-S0851 has a low gas fraction limit with a moderately low sSFR owing to the recent rejuvenation episode, which together result in a relatively short depletion time of <0.6 Gyr if no further H₂ gas is accreted. Empirical and analytical models both predict that we should have detected molecular gas in MRG-S0851, especially given the rejuvenation episode; this suggests that cold gas and/or dust is rapidly depleted in at least some early quiescent galaxies.

我们使用大毫米望远镜的 AzTEC 1.1 毫米成像对z = 1.883 0.001处的引力透镜大质量静止星系的尘埃连续通量和推断的气体含量提出了限制。MRG-S0851 似乎是一个典型的大质量致密静止星系，但有证据表明它在过去的 100 Myr 经历了一次中心集中的复兴事件。这个星系在 AzTEC 图像中没有被检测到，但我们计算了毫米通量的上限，并使用它通过经验校准的关系来估计 H ₂质量限制，假设分子 - 气体与灰尘的比率恒定为 150。我们限制来自 MRG-S0851 中尘埃连续体的 H ₂分数的 3 σ上限为. 由于最近的再生事件，MRG-S0851 具有较低的气体分数限制和适度低的 sSFR，如果没有更多的 H ₂气体被吸积，这共同导致 <0.6 Gyr 的相对较短的消耗时间。经验模型和分析模型都预测我们应该在 MRG-S0851 中检测到分子气体，特别是考虑到回春事件；这表明，至少在一些早期静止星系中，冷气体和/或尘埃正在迅速耗尽。