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- 저자 : Heinamaki, Pekka (검색결과 1 건)
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LARGE SDSS QUASAR GROUPS AND THEIR STATISTICAL SIGNIFICANCE
박창범,송현미,Maret Einasto,Heidi Lietzen,Pekka Heinamaki 한국천문학회 2015 Journal of The Korean Astronomical Society Vol.48 No.1
We use a volume-limited sample of quasars in the Sloan Digital Sky Survey (SDSS) DR7quasar catalog to identify quasar groups and address their statistical significance. This quasar samplehas a uniform selection function on the sky and nearly a maximum possible contiguous volume that canbe drawn from the DR7 catalog. Quasar groups are identified by using the Friend-of-Friend algorithmwith a set of fixed comoving linking lengths. We find that the richness distribution of the richest 100quasar groups or the size distribution of the largest 100 groups are statistically equivalent with those ofrandomly-distributed points with the same number density and sky coverage when groups are identifiedwith the linking length of 70 h−1Mpc. It is shown that the large-scale structures like the huge LargeQuasar Group (U1.27) reported by Clowes et al. (2013) can be found with high probability even if quasarshave no physical clustering, and does not challenge the initially homogeneous cosmological models. Ourresults are statistically more reliable than those of Nadathur (2013), where the test was made only for thelargest quasar group. It is shown that the linking length should be smaller than 50 h−1Mpc in order forthe quasar groups identified in the DR7 catalog not to be dominated by associations of quasars groupedby chance. We present 20 richest quasar groups identified with the linking length of 70 h−1Mpc for furtheranalyses.
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