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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Physical properties of spectroscopically confirmed galaxies at z ≥ 6. I. basic characteristics of the rest-frame UV continuum and Lyα emission
Astrophysical Journal, Volume 772, No. 2, Article 99, Year 2013
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Description
We present deep Hubble Space Telescope near-IR and Spitzer mid-IR observations of a large sample of spectroscopically confirmed galaxies at z ≥ 6. The sample consists of 51 Lyα emitters (LAEs) at z ≃ 5.7, 6.5, and 7.0, and 16 Lyman break galaxies (LBGs) at 5.9 ≤ z ≤ 6.5. The near-IR images were mostly obtained with WFC3 in the F125W and F160W bands, and the mid-IR images were obtained with IRAC in the 3.6 μm and 4.5 μm bands. Our galaxies also have deep optical imaging data from Subaru Suprime-Cam. We utilize the multi-band data and secure redshifts to derive their rest-frame UV properties. These galaxies have steep UV-continuum slopes roughly between β ≃ -1.5 and -3.5, with an average value of β ≃ -2.3, slightly steeper than the slopes of LBGs in previous studies. The slope shows little dependence on UV-continuum luminosity except for a few of the brightest galaxies. We find a statistically significant excess of galaxies with slopes around β ≃ -3, suggesting the existence of very young stellar populations with extremely low metallicity and dust content. Our galaxies have moderately strong rest-frame Lyα equivalent width (EW) in a range of ∼10 to ∼200 Å. The star formation rates are also moderate, from a few to a few tens of solar masses per year. The LAEs and LBGs in this sample share many common properties, implying that LAEs represent a subset of LBGs with strong Lyα emission. Finally, the comparison of the UV luminosity functions between LAEs and LBGs suggests that there exists a substantial population of faint galaxies with weak Lyα emission (EW < 20 Å) that could be the dominant contribution to the total ionizing flux at z ≥ 6. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Jiang, Linhua
United States, Tempe
School of Earth and Space Exploration
United States, Tucson
The University of Arizona
Egami, Eiichi E.
United States, Tucson
The University of Arizona
Mechtley, Matthew
United States, Tempe
School of Earth and Space Exploration
Fan, Xiaohui
United States, Tucson
The University of Arizona
Cohen, Seth H.
United States, Tempe
School of Earth and Space Exploration
Windhorst, Rogier A.
United States, Tempe
School of Earth and Space Exploration
Dav́e, Romeel
United States, Tucson
The University of Arizona
South Africa, Bellville
University of the Western Cape
Finlator, Kristian M.
Denmark, Copenhagen
Niels Bohr Institutet
Kashikawa, Nobunari
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Ouchi, Masami
Japan, Tokyo
The University of Tokyo
Shimasaku, Kazuhiro
Japan, Tokyo
The University of Tokyo
Statistics
Citations: 54
Authors: 11
Affiliations: 6
Identifiers
Doi:
10.1088/0004-637X/772/2/99
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental
Study Design
Cross Sectional Study