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arXiv 1801.04124astro-ph.COastro-ph.IMphysics.pop-ph
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用小仪器对普朗克星系团候选星系的光学跟踪

Optical Follow-up of Planck Cluster Candidates with Small Instruments

Vincent Boucher, Simon de Visscher, Christophe Ringeval

摘要:

我们报告的光学同行的普朗克Sunyaev-Zel'dovich(SZ)集群候选人使用0.6米的非专业望远镜的搜索。在观测到的源中,一个未经证实的候选者,PSZ 2 G156.24+22.32,被发现与Sunyaev-Zel'dovich最大信号坐标周围3弧分半径内的100多个星系有关。使用14小时的累积曝光超过斯隆滤色器g ',r',i ',和,z',我们估计这些星系的光度红移在zphot=0.29 +- 0.08。使用红序星系的方法得到光度红移为0.30 +0.03-0.05。结合普朗克SZ代理质量函数,这将有利于一个4.4 x 10^{14}太阳质量的星系团。这一结果表明,一个专门的天文台池配备了这样的仪器可以共同有助于光学后续计划的大规模集群候选人在中等红移。

英文摘要:

We report on the search for optical counterparts of Planck Sunyaev-Zel'dovich (SZ) cluster candidates using a 0.6 meter non-professional telescope. Among the observed sources, an unconfirmed candidate, PSZ2 G156.24+22.32, is found to be associated with a region of more than 100 galaxies within a 3 arcminutes radius around the Sunyaev-Zel'dovich maximum signal coordinates. Using 14 hours of cumulated exposure over the Sloan color filters g', r', i', and, z', we estimate the photometric redshift of these galaxies at zphot=0.29 +- 0.08. Using the red-sequence galaxy method gives a photometric redshift of 0.30 +0.03 -0.05. Combined with the Planck SZ proxy mass function, this would favor a cluster of 4.4 x 10^{14} solar masses. This result suggests that a dedicated pool of observatories equipped with such instruments could collectively contribute to optical follow-up programs of massive cluster candidates at moderate redshifts.

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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