论文标题
对J1030赤道领域的深1.4 GHz调查：跨宇宙时间的无线电源人群的新窗口
A deep 1.4 GHz survey of the J1030 equatorial field: a new window on radio source populations across cosmic time
论文作者
论文摘要
我们介绍了以Z = 6.3 SDSS QSO为中心的赤道场的深度L波段观测值，在该场中心达到〜2.5 Ujy的1 Sigma灵敏度。我们在直径〜30'的视野上提取了1489个无线电源的目录，降低到大约12.5 Ujy（5 Sigma）的通量密度。我们得出了有关目录可靠性和完整性的来源计数，并将其与文献中的其他可用性进行了比较。我们的来源数量是迄今为止可用的最深次数之一，总体而言，与最近计数的确定和模型一致。我们在无线电频段中首次检测到SDSS J1030 +0524 QSO（26 +/- 5 UJY）。我们得出了它的光无线电响度R_O = 0.62 +/- 0.12，这使其成为迄今为止发现并在无线电波长下检测到的Z> 〜6时最广播的AGN。我们揭示了与位于J1030场中心附近的明亮FRII射电星系的裂片相关的延伸散射无线电发射，这很可能成为Z = 1.7的原始群集的未来BCG。 Lobes的复合形态，再加上在Frii Galaxy Lobes周围检测到的X射线扩散发射的存在，可能指向无线电喷头与外部介质之间的相互作用。我们还研究了从同一磁场的500 ks chandra观测值获得的243个X射线选择对象的样品的无线电和X射线发光度之间的关系，并跨越了较大的红移范围（0〜 <Z〜 <3）。专注于具有光谱红移和分类的来源，我们发现ETG和AGN托管的源遵循log（l_r）/log（l_x）线性相关性，斜率分别为〜0.6和〜0.8。这被解释为在增生过程中效率不同的可能签名。最后，我们发现大多数这些来源（> 〜87％）显示了无线电对X射线无线电响度r_x <-3.5，将这些对象分类为无线电安静。
We present deep L-Band observations of the equatorial field centered on the z=6.3 SDSS QSO, reaching a 1 sigma sensitivity of ~2.5 uJy at the center of the field. We extracted a catalog of 1489 radio sources down to a flux density of ~12.5 uJy (5 sigma) over a field of view of ~ 30' diameter. We derived the source counts accounting for catalog reliability and completeness, and compared them with others available in the literature. Our source counts are among the deepest available so far, and, overall, are consistent with recent counts' determinations and models. We detected for the first time in the radio band the SDSS J1030+0524 QSO (26 +/- 5 uJy). We derived its optical radio loudness R_O = 0.62 +/- 0.12, which makes it the most radio quiet AGN at z >~ 6 discovered so far and detected at radio wavelengths. We unveiled extended diffuse radio emission associated with the lobes of a bright FRII radio galaxy located close to the center of the J1030 field, which is likely to become the future BCG of a protocluster at z=1.7. The lobes' complex morphology, coupled with the presence of X-ray diffuse emission detected around the FRII galaxy lobes, may point toward an interaction between the radio jets and the external medium. We also investigated the relation between radio and X-ray luminosity for a sample of 243 X-ray-selected objects obtained from 500 ks Chandra observations of the same field, and spanning a wide redshift range (0 ~< z ~< 3). Focused on sources with a spectroscopic redshift and classification, we found that sources hosted by ETG and AGN follow Log(L_R)/Log(L_X) linear correlations with slopes of ~0.6 and ~0.8, respectively. This is interpreted as a likely signature of different efficiency in the accretion process. Finally, we found that most of these sources (>~87%) show a radio-to-X-ray radio loudness R_X < -3.5, classifying these objects as radio quiet.
