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arXiv 1011.0153astro-ph.CO
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来自JVAS/CLASS的最终候选者搜索6角秒至15角秒的图像分离透镜

The final candidate from the JVAS/CLASS search for 6 arcsec to 15 arcsec image separation lensing

J. P. McKean

摘要:

菲利普斯等人在Jodrell Bank甚大阵天体测量巡天(JVAS)和宇宙透镜全天巡天(CLASS)中寻找6角秒到15角秒的图像分离透镜,发现了13个群和星团引力透镜候选者。通过无线电和光学成像和光谱学,菲利普斯等人排除了12个候选者的透镜假说。在本文中,新的光学成像和光谱的J 0122 +427,从JVAS/CLASS 6 arcsec到15 arcsec图像分离透镜搜索的最终候选透镜,提出。这个系统被发现不是一个引力透镜,而只是两个射电大声的活动星系核,它们在天空中相隔约10角秒,并且处于不同的红移。因此,可以得出结论,在JVAS和CLASS调查中没有重力透镜,图像分离在6弧秒到15弧秒之间。这一结果是一致的预期,集团和集群规模的暗物质晕是低效的镜头,由于其相对平坦的内部密度分布。

英文摘要:

A search for 6 arcsec to 15 arcsec image separation lensing in the Jodrell Bank-Very Large Array Astrometric Survey (JVAS) and the Cosmic Lens All-Sky Survey (CLASS) by Phillips et al. found thirteen group and cluster gravitational lens candidates. Through radio and optical imaging and spectroscopy, Phillips et al. ruled out the lensing hypothesis for twelve of the candidates. In this paper, new optical imaging and spectroscopy of J0122+427, the final lens candidate from the JVAS/CLASS 6 arcsec to 15 arcsec image separation lens search, are presented. This system is found not to be a gravitational lens, but is just two radio-loud active galactic nuclei that are separated by ~10 arcsec on the sky and are at different redshifts. Therefore, it is concluded that there are no gravitational lenses in the JVAS and CLASS surveys with image separations between 6 arcsec to 15 arcsec. This result is consistent with the expectation that group- and cluster-scale dark matter haloes are inefficient lenses due to their relatively flat inner density profiles.

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