Radio imaging of the Subaru/XMM-Newton Deep Field - I. The 100-μJy catalogue, optical identifications, and the nature of the faint radio source population
Radio imaging of the Subaru/XMM-Newton Deep Field - I. The 100-μJy catalogue, optical identifications, and the nature of the faint radio source population
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DOI：
10.1111/j.1365-2966.2006.10907.x
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发表时间：
2006-09
影响因子：
4.8
通讯作者：
C. Simpson;A. Martínez-Sansigre;S. Rawlings;R. Ivison;M. Akiyama;K. Sekiguchi;T. Takata;Y. Ueda-Y.-Ued
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文献类型：
--
作者：
C. Simpson;A. Martínez-Sansigre;S. Rawlings;R. Ivison;M. Akiyama;K. Sekiguchi;T. Takata;Y. Ueda-Y.-Ued
我们描述了在1.4 GHz的1.3度2斯巴鲁/XMM-牛顿深场（SXDF），非常大的阵列在B和C配置的深无线电成像。我们提出了一个无线电地图的整个领域，和一个目录的505个来源，覆盖0.8度2的峰值通量密度限制为100 μJy。对90%的辐射源提供了可靠的光学鉴定，并对除14个辐射源以外的所有辐射源提出了建议鉴定（其中7个是光学空白，7个靠近明亮的污染物体）。我们表明，射电源的光学特性不随流量密度的变化，这表明活动星系核（AGN）继续在微弱的流量密度显着贡献。我们通过将射电目录与X射线源目录互相关来检验这一论断，并得出结论，射电宁静活动星系核在流量密度低于300 μJy时成为一个重要的群体，如果其中相当一部分是康普顿厚度的，则可能主导导致射电源计数平坦化的群体。
We describe deep radio imaging at 1.4 GHz of the 1.3-deg 2 Subaru/XMM-Newton Deep Field (SXDF), made with the Very Large Array in B and C configurations. We present a radio map of the entire field, and a catalogue of 505 sources covering 0.8 deg 2 to a peak flux density limit of 100 μJy. Robust optical identifications are provided for 90 per cent of the sources, and suggested identifications are presented for all but 14 (of which seven are optically blank, and seven are close to bright contaminating objects). We show that the optical properties of the radio sources do not change with flux density, suggesting that active galactic nuclei (AGN) continue to contribute significantly at faint flux densities. We test this assertion by cross-correlating our radio catalogue with the X-ray source catalogue and conclude that radio-quiet AGN become a significant population at flux densities below 300 μJy, and may dominate the population responsible for the flattening of the radio source counts if a significant fraction of them are Compton-thick.