论文标题
Lofar两米的Sky Survey揭示的“ Hanny's Voorwerp”中的Relic Jet活动
Relic jet activity in "Hanny's Voorwerp" revealed by the LOFAR Two metre Sky Survey
论文作者
论文摘要
我们报告了从Lofar两米Sky Survey（Lotss）的第二个数据发布中获得的“ Hanny's Voorwerp”（以下简称HV）的新观察结果。 HV是Galaxy Zoo项目最初发现的Galaxy IC2497周围环境中的一个高度离子地区。新的150MHz观测值是在现有的多频无线电数据和档案窄带成像的背景下考虑的，以[OIII]发射线为中心。批次数据的合并灵敏度和空间分辨率（远远超过了无线电频率下可用的数据）揭示了从IC2497核中发出的大规模扩展发射的明确证据。无线电射流似乎在与HV共同分层的区域中在中性气晕中打了一个孔。新的150MHz数据以及新处理的档案1.64GHz EVLA数据表明，扩展的发射具有陡峭的频谱，这意味着年龄> 10^8 $ yr。供应扩展150MHz结构的喷气机必须在最近的作品中报道的X射线光度变化之前就必须“关闭”。在这张照片中，射流活性和辐射有效的活性银核的影响是HV的异常外观。
We report new observations of "Hanny's Voorwerp" (hereafter HV) taken from the second data release of the LOFAR Two-metre Sky Survey (LoTSS). HV is a highly-ionised region in the environs of the galaxy IC2497, first discovered by the Galaxy Zoo project. The new 150MHz observations are considered in the context of existing multi-frequency radio data and archival narrow-band imaging from the Hubble Space Telescope, centred on the [Oiii] emission line. The combined sensitivity and spatial resolution of the LoTSS data -- which far exceed what was previously available at radio frequencies -- reveal clear evidence for large-scale extended emission emanating from the nucleus of IC2497. The radio jet appears to have punched a hole in the neutral gas halo, in a region co-located with HV. The new 150MHz data, alongside newly-processed archival 1.64GHz eVLA data, reveal that the extended emission has a steep spectrum, implying an age $>10^8$yr. The jet supplying the extended 150MHz structure must have "turned off" long before the change in X-ray luminosity reported in recent works. In this picture, a combination of jet activity and the influence of the radiatively efficient active galactic nucleus are responsible for the unusual appearance of HV.
