arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.4176astro-ph.CO
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E-CDFS的sub-mJy无线电群:光学和红外对应物识别

The sub-mJy radio population of the E-CDFS: optical and infrared counterpart identification

M. Bonzini, V. Mainieri, P. Padovani, K. I. Kellermann, N. Miller, P. Rosati, P. Tozzi, S. Vattakunnel, I. Balestra, W. N. Brandt, B. Luo, Y. Q. Xue

摘要:

我们研究了一个样本的883源检测到的一个深甚大阵列调查在1.4 GHz的扩展钱德拉深场南。本文重点关注其光学和红外(IR)对应物的识别。我们使用的似然比技术是特别有用的,当处理深光学图像,以尽量减少虚假关联的数量。我们为95%的射电源找到了可靠的对应物。大多数的对应物(74%)检测到的光波长,但有一个显着的分数(21%),只有在IR检测。结合新获得的光谱与文献中的数据,我们能够分配红移81%的确定的射电源(37%光谱)。利用Chandra 4 Ms和250 ks的观测资料,我们还研究了射电源的X射线性质。特别是,我们使用的堆叠技术来获得的钱德拉图像中未检测到的无线电对象的平均属性。我们的分析结果收集在一个新的目录中,其中包含光学/红外对应物的位置、红移信息和X射线通量。这是最深的多波长射电源目录,将用于未来对该星系群的研究。

英文摘要:

We study a sample of 883 sources detected in a deep Very Large Array survey at 1.4 GHz in the Extended Chandra Deep Field South. The paper focuses on the identification of their optical and infrared (IR) counterparts. We use a likelihood ratio technique that is particularly useful when dealing with deep optical images to minimize the number of spurious associations. We find a reliable counterpart for 95% of our radio sources. Most of the counterparts (74%) are detected at optical wavelengths, but there is a significant fraction (21%) only detectable in the IR. Combining newly acquired optical spectra with data from the literature we are able to assign a redshift to 81% of the identified radio sources (37% spectroscopic). We also investigate the X-ray properties of the radio sources using the Chandra 4 Ms and 250 ks observations. In particular, we use a stacking technique to derive the average properties of radio objects undetected in the Chandra images. The results of our analysis are collected in a new catalog containing the position of the optical/IR counterpart, the redshift information and the X-ray fluxes. It is the deepest multi-wavelength catalog of radio sources, which will be used for future study of this galaxy population.

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。

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