用VLBA在92厘米观测44个河外射电源：LOFAR和RadioAstron可能的校准器和目标列表
Observations of 44 extragalactic radio sources with the VLBA at 92cm: A List of Potential Calibrators and Targets for LOFAR and RadioAstron
摘要：
目标。我们分析了VLBA 92厘米档案数据的44个河外来源，以确定早期目标和潜在的校准源的LOFAR射电望远镜和射电天文空间VLBI任务。其中一些源也将适合作为束内校准器，允许在同一视场中对其他微弱源进行深入、宽视场的研究。方法. 2003年1月1日至2006年12月31日期间观测到的所有公开可用的VLBA 92 cm数据都通过AIPS内实施的自动管道进行了分析。绝大多数数据都没有公布。结果样本由44个来源组成，其中34个已在至少一个VLBA基线上检测到。30个源有足够的数据可以成功成像。大多数源是紧凑的，少数显示扩展结构。在成像的30个源中，有13个是在最长的VLBA基线上检测到的（约为100个）。9兆波长），而所有这些都是在大于2兆波长的基线（LOFAR的最大基线，包括目前的国际基线）上检测到的。
英文摘要：
Aims. We have analysed VLBA 92cm archive data of 44 extragalactic sources in order to identify early targets and potential calibrator sources for the LOFAR radio telescope and the RadioAstron space VLBI mission. Some of these sources will also be suitable as in-beam calibrators, permitting deep, wide-field studies of other faint sources in the same field of view. Methods. All publicly available VLBA 92cm data observed between 1 January 2003 to December 31 2006 have been analysed via an automatic pipeline, implemented within AIPS. The vast majority of the data are unpublished. Results. The sample consists of 44 sources, 34 of which have been detected on at least one VLBA baseline. 30 sources have sufficient data to be successfully imaged. Most of the sources are compact, with a few showing extended structures. Of the 30 sources imaged, 13 are detected on the longest VLBA baselines (approx. 9 Mega wavelengths), while all were detected on baselines greater than 2 Mega wavelengths (the maximum baseline of LOFAR including the current international baselines).
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