Deep Extragalactic VLBI-Optical Survey (DEVOS) - I. Pilot MERLIN and VLBI observations
Deep Extragalactic VLBI-Optical Survey (DEVOS) - I. Pilot MERLIN and VLBI observations
复制标题
深河外 VLBI 光学巡天 (DEVOS) - I. 试点 MERLIN 和 VLBI 观测
DOI：
10.1051/0004-6361:20053473
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发表时间：
2005
影响因子：
6.5
通讯作者：
Johns Hopkins Univ.
中科院分区：
文献类型：
--
作者：
L. Mosoni;S. Frey;L. Gurvits;M. Garrett;S. Garrington;Z. I. T. K. Obs.;Fomi Sgo;Jive;Univ. Manchester Jbo;Johns Hopkins Univ.
本文介绍了深河外VLBI光学巡天（DEVOS）的初步观测结果。我们的最终目标是收集信息的紧凑结构在一个大样本的cxtragallic射电源（10104对象）到两个数量级比那些研究的典型成像甚长基线干涉测量（VLBI）调查到现在为止。这将为各种天体物理学、天体测量学和宇宙学研究提供一个前所未有的数据库。2002年5月，DEVOS计划成功地进行了第一次全球VLBI观测。我们从甚大阵（VLA）20厘米射电天空微弱图像（FIRST）目录中选择了没有任何光谱标准的源。多元素无线电链接干涉仪网络（MERLIN）也可以检测到。DEVOS试验样本源位于斯隆数字巡天（SDSS）覆盖的天空区域。我们描述了样品的选择和目前的高分辨率5 GHz的无线电图像的来源。根据这项试验研究的结果，我们估计的结果和所需的资源，一个全面的DEVOS项目。
We present the results of the pilot observations of the Deep Extragalactic VLBI-Optical Survey (DEVOS). Our ultimate aim is to collect information on compact structures in a large sample of cxtragalaclic radio sources (∼10 4 objects) up to two orders of magnitude fainter than those studied in typical imaging Very Long Baseline Interferometry (VLBI) surveys up until now. This would lead to an unprecedented data base for various astrophysical, astrometric and cosmological studies. The first global VLBI observations of the DEVOS programme were successfully conducted in May 2002. We selected sources without any spectral criterion from the Very Large Array (VLA) Faint Images of the Radio Sky at Twenty-centimeters (FIRST) catalogue. that are also detected with the Multi-Element Radio Linked Interferometer Network (MERLIN). The DEVOS pilot sample sources are in the area of the sky that is covered hy the Sloan Digital Sky Survey (SDSS). We describe the sample selection and present high resolution 5-GHz radio images of the sources. Based on the results of this pilot study, we estimate the outcome of and the resources needed for a full-scale DEVOS project.