The Low‐Frequency Radio Counterpart of theXMMLarge‐Scale Structure Survey

The XMM Large Scale Structure Survey (XMM-LSS) is a major project to map thelarge scale structure of the universe out to cosmological distances. An 8degree by 8 degree region will be surveyed by XMM with planned opticalfollow-up to produce a three-dimensional map of many hundreds of clusters outto a redshift of z = 1. To explore the relation of the large scale structure tothe location and properties of extragalactic radio sources, the XMM-LSS projectalso includes a low frequency radio survey of this region. This combinationwill provide unprecedented insight into how the radio source formation andevolution are affected by the local environment. Here, we present preliminaryresults from our 325 MHz and 74 MHz surveys in this region. At 325 MHz, we havea flux limit of 4 mJy/beam, a resolution of 6.3", and a total of 256 sourcedetections over 5.6 square degrees. At 74 MHz, we have a flux limit of 275mJy/beam, a resolution of 30", and a total of 211 source detections over 110square degrees. We describe these results and explore what they tell us aboutthe population of extra-galactic low frequency radio sources. The 74 MHz surveyrepresents the first presentation of a deep, sub-arcminute resolution survey atsuch a low frequency. This was made possible by recent advances in bothhardware and data reduction algorithms which we describe in detail.Comment: 41 pages, 11 figures, 4 tables: Accepted for publication in Ap