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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. II. Morphology of the rest-frame UV continuum and Lyα emission
Astrophysical Journal, Volume 773, No. 2, Article 153, Year 2013
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Description
We present a detailed structural and morphological study of a large sample of spectroscopically confirmed galaxies at z ≥ 6 using deep Hubble Space Telescope (HST) near-IR broad-band images and Subaru Telescope optical narrow-band images. The galaxy 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. These galaxies exhibit a wide range of rest-frame UV continuum morphology in the HST images, from compact features to multiple component systems. The fraction of merging/interacting galaxies reaches 40%-50% at the brightest end of M 1500 ≤ -20.5 mag. The intrinsic half-light radii r hl, in, after correcting for point-spread function (PSF) broadening, are roughly between r hl, in ≃ 0.″05 (0.3 kpc) and 0.″3 (1.7 kpc) at M 1500 ≤ -19.5 mag. The median r hl, in value is 0.″16 (∼0.9 kpc). This is consistent with the sizes of bright LAEs and LBGs at z ≥ 6 found in previous studies. In addition, more luminous galaxies tend to be larger and exhibit a weak size-luminosity relation, r hl, in∝L 0.14 at M 1500 ≤ -19.5 mag. The slope of 0.14 is significantly flatter than those in fainter LBG samples. We discuss the morphology of z ≥ 6 galaxies with nonparametric methods, including the concentration, asymmetry, and smoothness system and the Gini and M 20 parameters, and demonstrate their validity through simulations. We search for extended Lyα emission halos around LAEs at z ≃ 5.7 and 6.5 by stacking a number of narrow-band images. We do not find evidence of extended Lyα halos predicted by cosmological simulations. Such halos, if they exist, could be weaker than predicted. Finally, we investigate positional misalignment between the UV continuum and Lyα emissions in LAEs. While the two positions are generally consistent, several merging galaxies show significant positional differences. This is likely caused by a disturbed interstellar medium distribution due to merging activity. © 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
Fan, Xiaohui
United States, Tucson
The University of Arizona
Windhorst, Rogier A.
United States, Tempe
School of Earth and Space Exploration
Cohen, Seth H.
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
Mechtley, Matthew
United States, Tempe
School of Earth and Space Exploration
Ouchi, Masami
Japan, Tokyo
The University of Tokyo
Shimasaku, Kazuhiro
Japan, Tokyo
The University of Tokyo
Statistics
Citations: 74
Authors: 11
Affiliations: 6
Identifiers
Doi:
10.1088/0004-637X/773/2/153
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental