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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Clustering of Lyman break galaxies at z = 4 and 5 in the Subaru Deep Field: Luminosity dependence of the correlation function slope
Astrophysical Journal, Volume 637, No. 2 I, Year 2006
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Description
We explored the clustering properties of Lyman break galaxies at z = 4 and 5 with an angular two-point correlation function on the basis of the very deep and wide Subaru Deep Field data. We confirmed the previous result that the clustering strength of LBGs depends on the UV luminosity in the sense that brighter LBGs are more strongly clustered. In addition, we found an apparent dependence of the correlation function slope on UV luminosity for LBGs at both z = 4 and 5. More luminous LBGs have a steeper correlation function. The bias parameter was found to be a scale-dependent function for bright LBGs, whereas it appears to be almost scale-independent for faint LBGs. Luminous LBGs have a higher bias at smaller angular scales, which decreases as the scale increases. To compare these observational results, we constructed numerical mock LBG catalogs based on a semianalytic model of hierarchical clustering combined with high-resolution N-body simulation, carefully mimicking the observational selection effects. The luminosity functions and the overall correlation functions for LBGs at z = 4 and 5 predicted by this mock catalog were found to be almost consistent with the observation. The observed dependence of the clustering on UV luminosity was not reproduced by the model, unless subsamples of distinct halo mass were considered. That is, LBGs belonging to more massive dark halos had steeper and larger amplitude correlation functions. With this model, we found that LBG multiplicity in massive dark halos amplifies the clustering strength at small scales, which steepens the correlation function. The hierarchical clustering model could therefore be reconciled with the observed luminosity dependence of the correlation function if there is a tight correlation between UV luminosity and halo mass. Our finding that the slope of the correlation function depends on luminosity could be an indication that massive dark halos hosted multiple bright LBGs. © 2006. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Kashikawa, Nobunari
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Japan, Hayama
The Graduate University for Advanced Studies
Shimasaku, Kazuhiro
Japan, Tokyo
The University of Tokyo
Ouchi, Masami
United States, Baltimore
Space Telescope Science Institute
Matsuda, Yuichl
Japan, Kyoto
Kyoto University
Malkan, Matthew A.
United States, Los Angeles
University of California, Los Angeles
Doi, Mamoru
Japan, Tokyo
The University of Tokyo
Akiyama, Masayuki
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Aoki, Kentaro
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Furusawa, Hisanori
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Karoji, Hiroshi
Japan, Kyoto
Kyoto University
Kobayashi, Naoto
Japan, Tokyo
The University of Tokyo
Kodama, Tadayuki
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Miyazaki, Satoshi
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Morokuma, Tomoki
Japan, Tokyo
The University of Tokyo
Motohara, Kentaro
Japan, Tokyo
The University of Tokyo
Nagao, Tohru
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Italy, Florence
Osservatorio Astrofisico Di Arcetri
Ohta, Kouji
Japan, Kyoto
Kyoto University
Okamura, Sadanori
Japan, Tokyo
The University of Tokyo
Sekiguchi, Kazuhiro
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Taniguchi, Yoshiaki
Japan, Sendai
Tohoku University
Yasuda, Naoki
Japan, Tokyo
The University of Tokyo
Statistics
Citations: 78
Authors: 21
Affiliations: 10
Identifiers
Doi:
10.1086/498403
ISSN:
0004637X