首次探测到 POX 52 中中等质量黑洞的射电辐射：利用 ATCA 和 VLA 进行的深度多波段观测
First Detection of Radio Emission from the Intermediate Mass Black Hole in POX 52: Deep Multi-Band Observations with ATCA and VLA
AI总结：
本研究通过 ATCA 与 VLA 的深度多波段观测首次探测到矮星系 POX 52 的厘米波辐射，证实其中等质量黑洞的 AGN 活动，并发现其长期变化及与基本面低质量延伸的吻合。
摘要：
我们呈现了对 POX 52 的首次多波段厘米波探测结果。POX 52 是一个邻近矮星系，被认为拥有一个可靠的中等质量黑洞（IMBH）。我们使用 Australia Telescope Compact Array（ATCA）开展了覆盖 4.5 至 10 GHz 频率的深度观测，并利用 Karl G. Jansky Very Large Array（VLA）以其最大延展的 A 构型在 S 波段（2–4 GHz）和 C 波段（4–8 GHz）进行了高灵敏度观测。在 ATCA 观测中，该源呈现致密形态，仅在一个方向上被勉强分辨。VLA 的更高分辨率使我们能够略微分辨该源，并用二维高斯模型很好地拟合。探测到的射电辐射证实了活动星系核（AGN）活动的存在，表明其存在低功率喷流或由 AGN 驱动的风/外流。我们利用 ATCA 和 VLA 进行的双历元观测，结合以往未探测到的流量密度上限，揭示了跨越二十年的射电辐射变化。此外，我们发现 POX 52 与高吸积、射电宁静大质量 AGN 基本面的低质量延伸部分高度吻合。
英文摘要：
We present the first multi-band centimeter detection of POX 52, a nearby dwarf galaxy believed to habor a robust intermediate mass black hole (IMBH). We conducted the deep observations using the Australia Telescope Compact Array (ATCA), spanning frequencies from 4.5 to 10 GHz, as well as the sensitive observations from the Karl G. Jansky Very Large Array (VLA) operating in its most extended A-configuration at S band (2--4 GHz) and C band (4--8 GHz). In the ATCA observations, the source shows a compact morphology, with only one direction marginally resolved. The higher resolution of the VLA allowed us to slightly resolve the source, fitting it well with a two-dimensional Gaussian model. The detected radio emission confirms the presence of Active Galactic Nucleus (AGN) activity, indicating either a low-power jet or AGN-driven winds/outflows. Our dual-epoch observations with ATCA and VLA, together with previous non-detection flux density upper limits, reveal radio emission variability spanning two decades. In addition, we find that POX 52 aligns well with the low-mass extension of the fundamental plane for high-accretion, radio-quiet massive AGNs.
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