MeerKAT 发现一个高红移强引力透镜羟基巨maser
MeerKAT discovery of a high-redshift strongly-lensed hydroxyl gigamaser
AI总结：
MeerKAT发现了一个红移为1.027的最远羟基巨maser，其光谱复杂且亮度高，展示了MeerKAT和SKA在高红移OHM研究中的潜力。
摘要：
在低红移情况下，羟基巨maser（OHMs）已被证明可以追踪星系合并、遮蔽恒星burst、高分子气体密度以及候选双超大质量黑洞系统。鉴于这种天体物理学的用途，探索这些源在更大的宇宙回望时间下因此具有关键兴趣。虽然之前的OHM调查仅限于红移z≈0.25以内，但新的高灵敏度射电设施如MeerKAT显著增强了扩展OHM前沿的能力。在本文中，我们报告了在引力透镜系统HATLAS J142935.3-002836中发现一个OHM，其红移为z=1.027，是迄今发现的最远OHM源。该光谱融合了1667和1665MHz的发射，并表现出高度复杂的轮廓，光谱成分的宽度范围从<8km s⁻¹到≈300km s⁻¹。整合（未校正放大率）的光度为log(L_OH/L_⊙)=5.51±0.67，使该成为迄今已知最明显的OHM。在同一宽频带数据集中，我们还检测到了一个之前未知的HI吸收线。信号噪声比超过150，仅需4.7小时的观测就突显了MeerKAT和未来平方千米阵列中频阵列探索高红移OHM宇宙的潜力。
英文摘要：
At low redshifts, hydroxyl megamasers (OHMs) have been shown to trace galaxy mergers, obscured starbursts, high molecular gas densities, and candidate dual supermassive black hole systems. Given this astrophysical utility, exploring these sources at larger cosmological look-back times is therefore of key interest. While previous OHM surveys have been limited to redshifts of $z \lesssim 0.25$, the ability to expand the OHM frontier is significantly enhanced with new high-sensitivity radio facilities such as MeerKAT. In this Letter, we report the discovery of an OHM in the gravitational lens system HATLAS J142935.3-002836 at $z = 1.027$, the most distant OHM source yet detected. The spectrum has blended 1667 and 1665 MHz emission and exhibits a highly complex profile, with spectral components ranging in widths of $<8$ km s$^{-1}$ to $\sim300$ km s$^{-1}$. The integrated (magnification uncorrected) luminosity of log($L_{\rm OH} / L_{\odot}$) = 5.51 $\pm$ 0.67 makes this the most apparently luminous OHM known to date. In the same wide-band dataset, we have also detected a previously unknown ${\rm H I}$ absorption line. The signal-to-noise ratio of over 150 with just a 4.7 h observation highlights the potential that MeerKAT and the future Square Kilometre Array mid-frequency array offer to explore the high-redshift OHM universe.
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