低质量星系中双极斑块作为隐藏AGN活动的证据
Bipolar blobs as evidence of hidden AGN activities in the low-mass galaxies
AI总结：
本研究在低质量星系MaNGA 9885-9102中发现隐藏黑洞证据，提出利用双极Hα斑块探测活动黑洞光回声的新方法，在传统BPT图失效的低金属丰度环境中有效。
摘要：
我们报告了在低质量星系MaNGA 9885-9102中发现隐藏黑洞（BH）的证据，并提供了一种识别低质量星系中活动BH的新方法。该星系最初从MaNGA巡天中选出，在短轴上具有独特的双极Hα斑块。双极特征可能与AGN活动有关，而这两个斑块在BPT图上被分类为H II区，使得其起源令人困惑。Swift紫外连续谱显示这两个斑块没有紫外对应体，表明电离源位于斑块之外。与此一致，详细的光致电离模型倾向于AGN起源而非恒星形成起源，显著性为5.8σ。通过MBH-σ*关系估计的黑洞质量为MBH~7.2×10^5 M☉。本工作引入了一种新颖的方法来探测BH的光回声，在传统BPT图失效的低金属丰度环境中，该方法可能扩展至中等质量范围。
英文摘要：
We report the evidence of a hidden black hole (BH) in a low-mass galaxy, MaNGA 9885-9102, and provide a new method to identify active BH in low mass galaxies. This galaxy is originally selected from the MaNGA survey with distinctive bipolar H$α$ blobs at the minor axis. The bipolar feature can be associated with AGN activity, while the two blobs are classified as the H II regions on the BPT diagram, making the origins confusing. The Swift UV continuum shows that the two blobs do not have UV counterparts, suggesting that the source of ionization is out of the blobs. Consistent with this, the detailed photoionization models prefer to AGN rather than star-forming origin with a significance of 5.8$σ$. The estimated BH mass is $M_{\rm BH}\sim$7.2$\times 10^5 M_\odot$ from the $M_{\rm BH}-σ_*$ relationship. This work introduces a novel method for detecting the light echo of BHs, potentially extending to intermediate mass, in low metallicity environments where the traditional BPT diagram fails.
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