arXiv 2602.096582026-02-11astro-ph.GA

EMU射电观测 barred螺旋星系NGC 5938（Araish）

EMU Radio Observations of Barred Spiral Galaxy NGC 5938 (Araish)

Western Sydney University（西悉尼大学）；Gifu University（岐阜大学）；Shanghai Astronomical Observatory, CAS（中国科学院上海天文台）；Curtin University（科廷大学）；Australia Telescope National Facility, CSIRO（澳大利亚望远镜国家设施，CSIRO）；Macquarie University（麦考瑞大学）；National Radio Astronomy Observatory (NRAO)（美国国家射电天文台）；University of Calgary（卡尔加里大学）；Max Planck Institute for extraterrestrial Physics（马克斯·普朗克地外物理研究所）

H. Zakir, M. D. Filipović, L. Barnes, R. Z. E. Alsaberi, T. An, K. Dage, S. W. Duchesne, A. M. Hopkins, A. Kapinska, B. Koribalski, S. Lazarević, D. Leahy, Z. L… 展开作者

H. Zakir, M. D. Filipović, L. Barnes, R. Z. E. Alsaberi, T. An, K. Dage, S. W. Duchesne, A. M. Hopkins, A. Kapinska, B. Koribalski, S. Lazarević, D. Leahy, Z. Liu, R. P. Norris, A. Rau, Z. J. Smeaton, T. Jarrett

备注：: This Paper has been accepted for publication in PASA. It contains 12 Pages, 7 figures, and 2 Tables
DOI：: 10.1017/pasa.2026.10163

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AI总结：

通过EMU射电观测，研究NGC 5938的射电发射起源，揭示AGN活动与恒星形成相互作用及喷流被X射线气体晕包围的特征。

摘要：

我们对邻近的螺旋星系NGC 5938（Araish）进行了多波段观测，以研究其射电发射的起源，特别是活动星系核（AGN）活动和恒星形成对射电发射的贡献。利用进化宇宙地图（EMU）数据，我们检测到延伸至银河轴的射电发射，具有陡峭的非热频谱指数（α= -1.2 ± 0.2），表明来自AGN喷流的同步辐射。喷流的物理范围约为8.2kpc（角长64″）。来自暗能量相机平面调查2（DECaPS2）、宽场红外巡天探测器（WISE）和扩展罗entgen巡天与成像望远镜阵列（eROSITA）的多波段数据进一步支持了这一解释。显示WISE红外观测的色-色图表明存在尘埃和年轻恒星，这些恒星追踪星系的盘结构。我们的分析揭示了一个射电喷流，以及通过红外发射追踪的恒星形成，证明了在该高分辨星系中AGN活动和恒星形成的复杂相互作用。有趣的是，空间关系显示更亮的X射线发射主要邻近且包围扩展的射电发射。这表明，尽管射电喷流以显著的角度延伸至银河盘，但被更大的X射线气体晕包围，类似于其他系统（即ESO 295-IG022，Centaurus A）并且可能表明喷流的聚焦和引导效应。

英文摘要：

We present multi-wavelength observations of the nearby spiral galaxy NGC 5938 (Araish) to investigate the origin of its radio emission, specifically the contribution from active galactic nucleus (AGN) activity and star formation. Using Evolutionary Map of the Universe (EMU) data, we detect extended radio emission extending outwards to the galactic axis, with a steep non-thermal spectral index ($α= -1.2 \pm 0.2$) indicative of synchrotron radiation from an AGN jet. The jet has a physical extent of $\approx 8.2\,kpc$ (angular length of $64^{\prime\prime}$). Multi-wavelength data from The Dark Energy Camera Plane Survey 2 (DECaPS2), Wide-field Infrared Survey Explorer (WISE), and extended Roentgen Survey with an Imaging Telescope Array (eROSITA) provide further support for this interpretation. The colour-colour diagram presenting WISE infrared observations suggests the presence of dust and young stars that trace the galaxy's disk structure. Our analysis reveals a radio jet, alongside star formation traced by infrared emission, demonstrating the complex interplay of AGN activity and star formation in this well-resolved galaxy. Intriguingly, the spatial relationship reveals the brighter X-ray emission to be largely adjacent to and enveloping the extended radio emission. This suggests that the radio jet, while extending at a significant angle to the galactic disk, is confined by the larger X-ray gas halo, similar to other systems (i.e., ESO 295-IG022, Centaurus A) and may indicate jet collimation and channelling effects.

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