High-resolution studies of radio sources in the Hubble Deep and Flanking Fields
High-resolution studies of radio sources in the Hubble Deep and Flanking Fields
复制标题
哈勃深场和侧翼场射电源的高分辨率研究
DOI：
10.1111/j.1365-2966.2005.08824.x
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发表时间：
2005
影响因子：
4.8
通讯作者：
R. Windhorst
中科院分区：
文献类型：
--
作者：
T. Muxlow;A. Richards;S. Garrington;P. Wilkinson;B. Anderson;E. Richards;D. Axon;E. Fomalont;K. Kellermann;R. B. Partridge;R. Windhorst
18天的MERLIN数据和42小时1.4 GHz的a阵列VLA数据相结合，形成了以哈勃深场（HDF）为中心的10弧分场。这个区域也包括哈勃侧翼场（HFF）。利用VLA数据单独探测到92个射电源的完整样本，并利用MERLIN+VLA组合成像。合并后的图像提供了(i)更高的角分辨率（直径0.2-0.5弧秒的合成光束），（ii）提高了天文测量精度，（iii）与仅使用vla的数据相比，提高了灵敏度。这些图像是在1.4GHz频率下最敏感的图像之一，在0.2弧秒的图像中，rms噪声水平为3.3 μJy beam -1。几乎所有的光源都是分辨出来的，角大小在0.2到3角秒之间。中心3弧分广场单独成像，以搜索低至27 μJy的源。没有检测到额外的光源，这表明小于40 μJy的光源被MERLIN大量分辨，并且必须具有典型的角尺寸> 0.5 arcsec。与紧凑型星系相关的射电源已被用于将HDF、HFF和更大的CFHT光学场对准基于无线电的国际天体参考框架。HST光学场已被记录到70%的源是星爆型系统，与红移范围0.3-1.3的主要盘状星系有关。钱德拉的探测与92个射电源中的55个有关，但它们的x射线通量密度似乎与射电通量密度或形态无关。除了HDF8550.1外，HDF和HFF上最新的亚毫米结果并没有提供任何与这些最新无线电数据明确的识别，但至少提出了三个强有力的候选者。
18 days of MERLIN data and 42 h of A-array VLA data at 1.4 GHz have been combined to image a 10-arcmin field centred on the Hubble Deep Field (HDF). This area also includes the Hubble Flanking Fields (HFF). A complete sample of 92 radio sources with S 1.4 > 40 μJy was detected using the VLA data alone and then imaged with the MERLIN+VLA combination. The combined images offer (i) higher angular resolution (synthesized beams of diameter 0.2-0.5 arcsec), (ii) improved astrometric accuracy, and (iii) improved sensitivity compared with VLA-only data. The images are amongst the most sensitive yet made at 1.4GHz, with rms noise levels of 3.3 μJy beam -1 in the 0.2-arcsec images. Virtually all the sources are resolved, with angular sizes in the range 0.2 to 3 arcsec. The central 3-arcmin square was imaged separately to search for sources down to 27 μJy. No additional sources were detected, indicating that sources fainter than 40 μJy are heavily resolved with MERLIN and must have typical angular sizes > 0.5 arcsec. Radio sources associated with compact galaxies have been used to align the HDF, the HFF and a larger CFHT optical field to the radio-based International Celestial Reference Frame. The HST optical fields have been registered to 70 per cent of the sources are starburst-type systems associated with major disc galaxies in the redshift range 0.3-1.3. Chandra detections are associated with 55 of the 92 radio sources, but their X-ray flux densities do not appear to be correlated with the radio flux densities or morphologies. The most recent submillimetre results on the HDF and HFF do not provide any unambiguous identifications with these latest radio data, except for HDF8550.1, but suggest at least three strong candidates.