arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1301.7004astro-ph.CO
收藏

VLA 1.4GHz扩展Chandra深场南巡天:第二次数据发布

The VLA 1.4GHz Survey of the Extended Chandra Deep Field South: Second Data Release

N. A. Miller, M. Bonzini, E. B. Fomalont, K. I. Kellermann, V. Mainieri, P. Padovani, P. Rosati, P. Tozzi, S. Vattakunnel

摘要:

2007年6月至9月,在1.4GHz的扩展钱德拉深场南部进行了深射电观测,并在第一次数据发布中公布(Miller等人,2008年)。该调查是使用超大型阵列(VLA)的六个独立点进行的,每个点的观测时间超过40小时。在目前的文件中,我们改进的数据减少产生第二次数据释放(DR 2)镶嵌图像。该DR 2图像覆盖约三分之一平方度的区域,最佳均方根灵敏度为6 uJy,典型灵敏度为7.4 uJy/2.8”x 1.6”光束。我们还提出了一个更全面的目录,包括源下降到峰值通量密度的五倍或更多倍的本地均方根噪声以及源的大小和相关的指向数据的信息。我们讨论了一些详细的考虑是否源下解决的复杂性的无线电图像创建为马赛克的单独的点,每个遭受一定程度的带宽拖尾,和准确的评估这些来源的通量密度。最后,射电形态和光学/近红外对应物识别(Bonzini等人,2012年)用于识别17个可能的多分量源,并得出883个射电源的目录,这大约是第一次数据发布中包含的源数量的两倍。

英文摘要:

Deep radio observations at 1.4GHz for the Extended Chandra Deep Field South were performed in June through September of 2007 and presented in a first data release (Miller et al. 2008). The survey was made using six separate pointings of the Very Large Array (VLA) with over 40 hours of observation per pointing. In the current paper, we improve on the data reduction to produce a second data release (DR2) mosaic image. This DR2 image covers an area of about a third of a square degree and reaches a best rms sensitivity of 6 uJy and has a typical sensitivity of 7.4 uJy per 2.8" by 1.6" beam. We also present a more comprehensive catalog, including sources down to peak flux densities of five or more times the local rms noise along with information on source sizes and relevant pointing data. We discuss in some detail the consideration of whether sources are resolved under the complication of a radio image created as a mosaic of separate pointings each suffering some degree of bandwidth smearing, and the accurate evaluation of the flux densities of such sources. Finally, the radio morphologies and optical/near-IR counterpart identifications (Bonzini et al. 2012) are used to identify 17 likely multiple-component sources and arrive at a catalog of 883 radio sources, which is roughly double the number of sources contained in the first data release.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑