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arXiv 1202.6424astro-ph.CO
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斯隆数字巡天III确定的132,684个星系团目录

A catalog of 132,684 clusters of galaxies identified from Sloan Digital Sky Survey III

Z. L. Wen, J. L. Han, F. S. Liu

摘要:

利用Sloan Digital Sky Survey III(SDSS-III)的星系光度红移,我们识别出了132,684个红移范围为0.05&lt;z <0.8. Monte Carlo simulations show that the false detection rate is less than 6% for the whole sample. The completeness is more than 95% for clusters with a mass of M_{200} >1.0*10^{14}的星系团,其中M_{\odot}的红移范围为0.05&lt;z&lt;0.42,而z&gt;0.42的星系团由于成员星系的不完整性,其完整度和丰富度都比真实星系团小。我们将我们的样本与其他聚类样本进行比较,发现超过90%的先前已知的0.05&lt;z&lt;0.42的丰富聚类与我们样本中的聚类相匹配。更富的星系团往往有更明亮的最亮星系团(BCGs)。结合X射线和Planck数据,我们发现星系团的丰度与X射线光度、温度和Sunyaev-Zel'dovich测量密切相关。与SDSS亮红星系(LRG)样本的比较表明,25%的LRG是我们星系团的BCG,36%的LRG是星系团成员星系。在我们的聚类样本中,63%的r_{petro} &lt;19.5的BCG满足SDSS LRG选择标准。

英文摘要:

Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey III (SDSS-III), we identify 132,684 clusters in the redshift range of 0.05<z<0.8. Monte Carlo simulations show that the false detection rate is less than 6% for the whole sample. The completeness is more than 95% for clusters with a mass of M_{200}>1.0*10^{14} M_{\odot} in the redshift range of 0.05<z<0.42, while clusters of z>0.42 are less complete and have a biased smaller richness than the real one due to incompleteness of member galaxies. We compare our sample with other cluster samples, and find that more than 90% of previously known rich clusters of 0.05<z<0.42 are matched with clusters in our sample. Richer clusters tend to have more luminous brightest cluster galaxies (BCGs). Correlating with X-ray and the Planck data, we show that the cluster richness is closely related to the X-ray luminosity, temperature and Sunyaev-Zel'dovich measurements. Comparison of the BCGs with the SDSS luminous red galaxy (LRG) sample shows that 25% of LRGs are BCGs of our clusters and 36% of LRGs are cluster member galaxies. In our cluster sample, 63% of BCGs of r_{petro}<19.5 satisfy the SDSS LRG selection criteria.

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