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首页> 外文期刊>The Astrophysical journal >The Low-Frequency Radio Counterpart of the XMM Large-Scale Structure Survey
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The Low-Frequency Radio Counterpart of the XMM Large-Scale Structure Survey

机译:XMM大规模结构调查的低频无线电对口

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The XMM Large-Scale Structure Survey (XMM-LSS) is a major project to map the large-scale structure of the universe out to cosmological distances. An 8° × 8° region will be surveyed by XMM with planned optical follow-up to produce a three-dimensional map of many hundreds of clusters out to a redshift of z = 1. To explore the relation of the large-scale structure to the location and properties of extragalactic radio sources, the XMM-LSS project also includes a low-frequency radio survey of this region. This combination will provide unprecedented insight into how the radio source formation and evolution are affected by the local environment. Here we present preliminary results from our 325 and 74 MHz surveys in this region. At 325 MHz, we have a flux limit of 4 mJy beam-1, a resolution of 63, and a total of 256 source detections over 5.6 deg2. At 74 MHz, we have a flux limit of 275 mJy beam-1, a resolution of 30'', and a total of 211 source detections over 110 deg2. We describe these results and explore what they tell us about the population of extragalactic low-frequency radio sources. The 74 MHz survey represents the first presentation of a deep, subarcminute resolution survey at such a low frequency. This was made possible by recent advances in both hardware and data reduction algorithms, which we describe in detail.
机译:XMM大规模结构调查(XMM-LSS)是一项重大项目,旨在将宇宙的大规模结构映射到宇宙学距离。 XMM将对8°×8°区域进行勘测,并计划进行光学跟踪,以产生数百个簇的三维图,并得出z = 1的红移。由于河外无线电源的位置和性质,XMM-LSS项目还包括对该区域的低频无线电调查。这种结合将使人们对无线电源的形成和发展如何受到当地环境的影响提供前所未有的见识。在这里,我们介绍了我们在该地区进行的325和74 MHz调查的初步结果。在325 MHz处,我们的光束1的通量极限为4 mJy,分辨率为63,在5.6 deg2范围内总共进行了256次源探测。在74 MHz下,我们的光束1的通量极限为275 mJy,分辨率为30英寸,在110度2范围内总共进行了211次源探测。我们描述了这些结果,并探讨了它们对银河系低频无线电源数量的告诉。 74 MHz的测量代表了在如此低的频率下首次进行的深亚弧分辨率的测量。硬件和数据缩减算法的最新进展使之成为可能,我们将对此进行详细介绍。

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