Probing the high frequency variability of NGC 5044: the key to AGN feedback

arXiv - PHYS - High Energy Astrophysical Phenomena Pub Date : 2024-09-09 DOI:arxiv-2409.06039

Gerrit Schellenberger, Ewan O'Sullivan, Laurence David, Jan Vrtilek, Charles Romero, Glen Petitpas, William Forman, Simona Giacintucci, Mark Gurwell, Christine Jones, Kamlesh Rajpurohit, Francesco Ubertosi, Tiziana Venturi

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Abstract

The active galactic nucleus (AGN) feeding and feedback process in the centers of galaxy clusters and groups is still not well understood. NGC5044 is the ideal system in which to study AGN feedback. It hosts the largest known reservoir of cold gas in any cool-core galaxy group, and features several past epochs of AGN feedback imprinted as cavities in the X-ray bright intragroup medium (IGrM), as well as parsec scale jets. We present Submillimeter Array (SMA) and Karl G. Jansky Very Large Array (VLA) high frequency observations of NGC5044 to assess the time variability of the mm-waveband emission from the accretion disk, and quantify the Spectral Energy Distribution (SED) from the radio to sub-millimeter band. The SED is well described by advection dominated accretion flow (ADAF) model and self-absorbed jet emission from an aging plasma with tau ~1kyr. We find a characteristic variability timescale of 150 days, which constrains the ADAF emission region to about 0.1pc, and the magnetic field to 4.7mG in the jets and and 870G in the accretion disk. A longer monitoring/sampling will allow to understand if the underlying process is truly periodic in nature.

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探测NGC 5044的高频变率：AGN反馈的关键

人们对星系团和星系群中心的活动星系核（AGN）的馈源和反馈过程还不是很了解。NGC5044是研究AGN反馈的理想系统。在所有冷核星系群中，NGC5044拥有已知最大的冷气体贮藏库，并且有几个AGN反馈的过去时序，在X射线明亮的群内介质（IGrM）中表现为空洞，以及等秒尺度的喷流。我们展示了亚毫米波阵列（SMA）和卡尔-G-扬斯基甚大阵列（VLA）对NGC5044的高频观测，以评估来自增殖盘的毫米波带发射的时变性，并量化从无线电波带到亚毫米波带的光谱能量分布（SED）。SED可以很好地用平流主导的增生流（ADAF）模型和来自老化等离子体的自吸收射流发射（tau ~1kyr）来描述。我们发现了一个 150 天的特征变异时间尺度，它将 ADAF 发射区域限制在大约 0.1pc 的范围内，并将喷流中的磁场限制在 4.7mG 的范围内，将吸积盘中的磁场限制在 870G 的范围内。长时间的监测/取样将有助于了解基本过程是否真正具有周期性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - High Energy Astrophysical Phenomena

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