arXiv 1107.24632011-07astro-ph.CO

KCAL VERA 22 GHz校准器调查

The KCAL VERA 22 GHz calibrator survey

Leonid Petrov, Mareki Honma, Katsunori M. Shibata

备注：: Accepted for publication by the Astronomical Journal. 6 pages, 3 figures, 3 table. The machine readable catalogue file, kcal_cat.txt can be extracted from the source of this submission
发表信息：: The Astronomical Journal, Volume 143, Issue 2, article id. 35 (2012)
DOI：: 10.1088/0004-6256/143/2/35

摘要：

我们观察到在22 GHz的VLBI阵列VERA的1536个源的相关通量密度在8 GHz的亮度超过200毫焦耳的样本。已探测到一半的目标源。检测限约为200 mJy。我们推导出的相关通量密度的877个检测源在三个范围内的投影基线长度。这些观测的目的是确定给定源作为高频双波束和相位参考观测的相位校准器的适用性。初步结果表明，在22千兆赫的致密河外源的数量比一个给定的相关通量密度水平是两倍，在8千兆赫。

英文摘要：

We observed at 22 GHz with the VLBI array VERA a sample of 1536 sources with correlated flux densities brighter than 200 mJy at 8 GHz. One half of target sources has been detected. The detection limit was around 200 mJy. We derived the correlated flux densities of 877 detected sources in three ranges of projected baseline lengths. The objective of these observations was to determine the suitability of given sources as phase calibrators for dual-beam and phase-referencing observations at high frequencies. Preliminary results indicate that the number of compact extragalactic sources at 22 GHz brighter than a given correlated flux density level is twice less than at 8 GHz.

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