Unveiling the origin of the radio emission in radio-quiet quasars
Unveiling the origin of the radio emission in radio-quiet quasars
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DOI：
10.1051/0004-6361/201628302
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发表时间：
2016-03
影响因子：
6.5
通讯作者：
N. H. Ruiz;E. Middelberg;R. Norris;Alessandro Maini
中科院分区：
文献类型：
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作者：
N. H. Ruiz;E. Middelberg;R. Norris;Alessandro Maini
射电静默类星体(RQQ)中射电辐射的起源一直是一个有争议的问题。目前还不清楚这种发射是由宿主星系中的恒星形成还是由活动星系核(AGN)的黑洞活动引起的。我们使用甚长基线干涉测量(VLBI)技术在宇宙演化调查(COSMOS)领域中寻找RQQ，从而阐明了这些问题。该领域广泛的多波长覆盖(从无线电到X射线)被用来分类RQS，而VLBI的毫弧秒分辨率提供了一种直接识别活动星系核的方法。在一个18个RQQ的样本中，我们使用1.4 GHz的甚长基线阵列(VLBA)检测到3个RQQ。在这封信中，我们首次报道了来自活动星系核的RQQ样本，其射电辐射的下限为测量的下限，从而证明至少部分RQQ的射电辐射由AGN主导。
The origin of the radio emission in radio-quiet quasars (RQQs) has been a matter of debate for a long time. It is not well understood whether the emission is caused by star formation in the host galaxy or by black hole activity of the active galactic nuclei (AGN). We shed some light on these questions using the Very Long Baseline Interferometry (VLBI) technique to search for RQQs in the field of the Cosmological Evolution Survey (COSMOS). The extensive multi-wavelength coverage of the field (from radio to X-rays) was used to classify RQQs, and the milli-arcsecond resolution of VLBI provides a direct way to identify AGNs. In a sample of 18 RQQs we detected 3 using the Very Long Baseline Array (VLBA) at 1.4 GHz. In this Letter we report for the first time on a sample of RQQs with a measured lower limit on the fraction of radio emission coming from the AGN, thus demonstrating that the radio emission of at least some RQQs is dominated by an AGN.