MaNGA AGN矮星系（MAD）-- IV. 通过射电观测揭示矮星系中的隐藏AGN
MaNGA AGN dwarf galaxies (MAD) -- IV. Revealing hidden AGN in dwarf galaxies with radio observations
AI总结：
通过射电观测揭示矮星系中隐藏的AGN，发现其中一颗星系具有与MaNGA数据一致的AGN特征，表明矮星系可拥有强大射流。
摘要：
低质量黑洞宿主的矮星系为理解星系形成和大质量黑洞增长提供了有价值的见解。由于其低光度和紧凑的尺寸，检测这些黑洞作为AGN具有挑战性。可以通过多波段观测策略来解决这一问题，例如结合光学和射电观测，这使得能够检测到可能被单波段分析所隐藏的AGN特征。我们旨在检测四颗具有AGN特征的矮星系中的喷流状发射，以确定其是否包含AGN。我们基于SDSS MaNGA的空间解析发射线诊断图进行分析。确认AGN的存在将证明IFU光谱学是一种识别隐藏或关闭的AGN的有用工具。使用VLA射电观测，我们对四颗矮星系的射电发射进行成像，并推导出它们的总射电流量和亮度。我们将这些结果与恒星形成过程预期的结果进行比较，以确定射电发射的起源，并探测其是否与发射线诊断图的结果一致。我们发现四颗星系中有一颗显示出与MaNGA IFU数据分析一致的AGN射电发射。该源的动能喷流功率约为1e42 erg/s，表明矮星系可以拥有与大质量射电星系同样强大的射流。该星系表现出能够逃脱暗物质晕引力束缚的AGN喷流，同时中心区域的恒星形成率有所下降。这表明存在AGN的负反馈，可能在抑制恒星形成。其他三颗星系显示出与恒星起源一致的射电发射区域，并与IFU光谱学中发现的恒星形成区域重叠。
英文摘要：
Low-mass black holes hosted by dwarf galaxies offer valuable insights into galaxy formation and the growth of the massive black holes found in massive galaxies. Their detection as AGN is challenging due to their low luminosity and compact size. This can be circumvented employing multi-wavelength observational strategies, such as combining optical and radio observations, which enables the detection of AGN features that may be hidden in single-wavelength analyses We aim to detect any jet-like emission indicative of the presence of an AGN in a sample of four dwarf galaxies with AGN signatures based on spatially resolved emission line diagnostic diagrams with SDSS MaNGA. Confirming the presence of an AGN will prove IFU spectroscopy to be a resourceful tool for identifying hidden or switched-off AGN. Using VLA radio observations, we image the radio emission of the four dwarf galaxies and derive their integrated radio flux and luminosity. We compare these to that expected from star formation processes to determine the origin of the radio emission and probe if it is consistent with the results of the emission line diagnostic diagrams. We find that one out of the four galaxies shows AGN radio emission consistent with the analysis of the MaNGA IFU data. The kinetic jet power of this source is Qjet ~ 1e42 erg / s, indicating that dwarf galaxies can host radio jets as powerful as those of massive radio galaxies. This galaxy exhibits an AGN outflow able to escape the gravitational bound produced by the dark matter halo, along with a decrease in the star formation rate of the central region. This suggests the presence of negative feedback from the AGN, which could be suppressing star formation. The other three galaxies exhibit regions of radio emission consistent with a stellar origin and overlapping with the star-forming regions found in the IFU spectroscopy.
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