TY - JOUR
T1 - Physical Properties of Spectroscopically Confirmed Galaxies at z >= 6. II. Morphology of the Rest-frame UV Continuum and Lyα Emission
AU - Jiang, Linhua
AU - Egami, Eiichi
AU - Fan, Xiaohui
AU - Windhorst, Rogier A.
AU - Cohen, Seth H.
AU - Davé, Romeel
AU - Finlator, Kristian
AU - Kashikawa, Nobunari
AU - Mechtley, Matthew
AU - Ouchi, Masami
AU - Shimasaku, Kazuhiro
PY - 2013/8/5
Y1 - 2013/8/5
N2 - 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 = 6 found in
previous studies. In addition, more luminous galaxies tend to be larger
and exhibit a weak size-luminosity relation, r hl, invpropL
0.14 at M 1500 = 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.
Based in part on observations made with the NASA/ESA Hubble Space
Telescope, obtained from the data archive at the Space Telescope Science
Institute, which is operated by the Association of Universities for
Research in Astronomy, Inc. under NASA contract NAS 5-26555. Based in
part on observations made with the Spitzer Space Telescope, which is
operated by the Jet Propulsion Laboratory, California Institute of
Technology, under a contract with NASA. Based in part on data collected
at the Subaru Telescope and obtained from the Subaru-Mitaka-Okayama-Kiso
Archive System (SMOKA), which is operated by the Astronomy Data Center,
National Astronomical Observatory of Japan.
AB - 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 = 6 found in
previous studies. In addition, more luminous galaxies tend to be larger
and exhibit a weak size-luminosity relation, r hl, invpropL
0.14 at M 1500 = 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.
Based in part on observations made with the NASA/ESA Hubble Space
Telescope, obtained from the data archive at the Space Telescope Science
Institute, which is operated by the Association of Universities for
Research in Astronomy, Inc. under NASA contract NAS 5-26555. Based in
part on observations made with the Spitzer Space Telescope, which is
operated by the Jet Propulsion Laboratory, California Institute of
Technology, under a contract with NASA. Based in part on data collected
at the Subaru Telescope and obtained from the Subaru-Mitaka-Okayama-Kiso
Archive System (SMOKA), which is operated by the Astronomy Data Center,
National Astronomical Observatory of Japan.
KW - cosmology: observations
KW - galaxies: evolution
KW - galaxies: high-redshift
U2 - 10.1088/0004-637X/773/2/153
DO - 10.1088/0004-637X/773/2/153
M3 - Article
SN - 0004-637X
VL - 773
SP - 153
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
ER -