We have obtained Keck near-infrared spectroscopy of a sample of nine M _⋆ < 10¹⁰ M _⊙ dwarf galaxies to confirm active galactic nuclei (AGNs) activity and the presence of galaxy-wide, AGN-driven outflows through coronal line (CL) emission. We find strong CL detections in 5/9 galaxies (55%) with line ratios incompatible with shocks, confirming the presence of AGNs in these galaxies. Similar CL detection rates are found in larger samples of more massive galaxies hosting type 1 and 2 AGNs. We investigate the connection between the CLs and galaxy-wide outflows by analyzing the kinematics of the CL region as well as the scaling of gas velocity with ionization potential of different CLs. In addition, using complementary Keck Cosmic Web Imager observations of these objects, we find that the outflow velocities measured in [Si vi] are generally faster than those seen in [O iii]. The galaxies with the fastest outflows seen in [O iii] also have the highest [Si vi] luminosity. The lack of J-band CN absorption features, which are often associated with younger stellar populations, provides further evidence that these outflows are driven by AGNs in low-mass galaxies.

我们获得了九个M _⋆ < 10 ¹⁰ M _⊙样品的 Keck 近红外光谱矮星系以确认活动星系核 (AGN) 活动以及星系范围内 AGN 驱动的通过日冕线 (CL) 发射的流出物的存在。我们在 5/9 星系 (55%) 中发现了强烈的 CL 检测，其线比与冲击不相容，证实了这些星系中存在 AGN。在拥有 1 型和 2 型 AGN 的更大质量星系的更大样本中发现了类似的 CL 检测率。我们通过分析 CL 区域的运动学以及气体速度与不同 CL 的电离势的比例来研究 CL 与星系范围外流之间的联系。此外，使用对这些天体的补充 Keck Cosmic Web Imager 观测，我们发现 [Si vi ] 中测量的流出速度通常比 [O iii]。在 [O iii ] 中看到的外流速度最快的星系也具有最高的 [Si vi ] 光度。J波段 CN 吸收特征的缺乏，这通常与年轻的恒星群体有关，这进一步证明了这些外流是由低质量星系中的 AGN 驱动的。