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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Luminosity functions of Lyman break galaxies at z ∼ 4 and z ∼ 5 in the Subaru Deep Field
Astrophysical Journal, Volume 653, No. 2 I, Year 2006
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Description
We investigate the luminosity functions of Lyman break galaxies (LBGs) at z ∼ 4 and z ∼ 5 based on optical imaging data obtained in the Subaru Deep Field project. Three samples of LBGs in a contiguous area of 875 arcmin 2 are constructed. One consists of 3808 LBGs at z ∼ 4 down to I′ = 26.85 selected with the B-R versus R-i′ diagram. The other two consist of 539 and 240 LBGs at z ∼ 5 down to z′ = 26.05 selected with two kinds of two-color diagram: V- i′ versus i′-z′ and R-i′ versus i′-z′. The adopted selection criteria are proved to be fairly reliable by spectroscopic observations. We derive the luminosity functions of the LBGs at rest-frame ultraviolet wavelengths down to M UV = -19.2 at z ∼ 4 and MUV= -20.3 at z ∼ 5. We find clear evolution of the luminosity function over the redshift range 0 ≤ z ≤ 6, which is accounted for solely by a change in the characteristic magnitude M*. We examine the evolution of the cosmic star formation rate (SFR) density and its luminosity dependence over 0 ≤ z ≲ 6. The SFR density contributed from brighter galaxies is found to change more drastically with cosmic time. The contribution from brighter galaxies has a sharp peak around z = 3-4, while that from fainter galaxies evolves relatively mildly with a broad peak at earlier epochs. Combining the observed SFR density with the standard cold dark matter model, we compute the cosmic SFR per unit baryon mass in dark halos, that is, the specific SFR. The specific SFR is found to scale with redshift as (1 + z)3 up to z ∼ 4, implying that the efficiency of star formation is on average higher at higher redshift in proportion to the cooling rate within dark halos, while this is not simply the case at z ≳ 4. © 2006. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Shimasaku, Kazuhiro
Japan, Tokyo
The University of Tokyo
Kashikawa, Nobunari
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Japan, Hayama
The Graduate University for Advanced Studies
Ouchi, Masami
United States, Baltimore
Space Telescope Science Institute
United States, Princeton–carnegie Fellow
Hubble
Okamura, Sadanori
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
Doi, Mamoru
Japan, Tokyo
The University of Tokyo
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
Malkan, Matthew A.
United States, Los Angeles
University of California, Los Angeles
Matsuda, Yuichl
Japan, Kyoto
Kyoto University
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, Rome
Istituto Nazionale Di Astrofisica, Rome
Ohta, Kouji
Japan, Kyoto
Kyoto University
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: 116
Authors: 21
Affiliations: 11
Identifiers
ISSN:
0004637X