SILVERRUSH. II. First Catalogs and Properties of \textasciitilde2,000 Lya Emitters and Blobs at z\textasciitilde6-7 Identified over the 14-21 deg2 Sky

SILVERRUSH. II. First Catalogs and Properties of \textasciitilde2,000 Lya Emitters and Blobs at z\textasciitilde6-7 Identified over the 14-21 deg2 Sky. Shibuya, T., Ouchi, M., Konno, A., Higuchi, R., Harikane, Y., Ono, Y., Shimasaku, K., Taniguchi, Y., Kobayashi, M. A. R., Kajisawa, M., Nagao, T., Furusawa, H., Goto, T., Kashikawa, N., Komiyama, Y., Kusakabe, H., Lee, C., Momose, R., Nakajima, K., Tanaka, M., Wang, S., & Yuma, S. ArXiv e-prints, 1704:arXiv:1704.08140, April, 2017.
$SILVERRUSH. II. First Catalogs and Properties of \textasciitilde2,000 Lya Emitters and Blobs at z\textasciitilde6-7 Identified over the 14-21 deg2 Sky [link]$ Paper abstract bibtex

We present an unprecedentedly large catalog consisting of 2,354 \textgreater\textasciitilde L\textasciicircum* Lya emitters (LAEs) at z=5.7 and 6.6 on the 13.8 and 21.2 deg\textasciicircum2 sky, respectively, that are identified by the SILVERRUSH program with the first narrowband imaging data of the Hyper Suprime-Cam (HSC) survey. We confirm that the LAE catalog is reliable on the basis of 97 LAEs whose spectroscopic redshifts are already determined by this program and the previous studies. This catalogue is also available on-line. Based on this catalogue, we derive the rest-frame Lya equivalent-width distributions of LAEs at z=5.7 and 6.6 that are reasonably explained by the exponential profiles with the scale lengths of 72+/-19 and 119+/-4 A, respectively, showing the increase trend towards high-z. We find that \textasciitilde700 LAEs with a large equivalent width (LEW) of \textgreater\textasciitilde 240 A are candidates of young-metal poor galaxies and AGNs. We also find that the fraction of LEW LAEs to all ones is moderately large, \textasciitilde30%. Our LAE catalog includes 11 Lya blobs (LABs) that are LAEs with spatially extended Lya emission whose profile is clearly distinguished from those of stellar objects at the \textgreater\textasciitilde 3sigma level. The number density of the LABs at z=6-7 is \textasciitilde10\textasciicircum\-7\-10\textasciicircum\-6\ Mpc-3, being \textasciitilde10-100 times lower than those claimed for LABs at z\textasciitilde2-3, suggestive of disappearing LABs at z\textgreater\textasciitilde6, albeit with the different selection methods and criteria for the low and high-z LABs.

@article{shibuya_silverrush._2017-1,
	title = {{SILVERRUSH}. {II}. {First} {Catalogs} and {Properties} of {\textasciitilde}2,000 {Lya} {Emitters} and {Blobs} at z{\textasciitilde}6-7 {Identified} over the 14-21 deg2 {Sky}},
	volume = {1704},
	url = {http://adsabs.harvard.edu/abs/2017arXiv170408140S},
	abstract = {We present an unprecedentedly large catalog consisting of 2,354 {\textgreater}{\textasciitilde} 
L{\textasciicircum}* Lya emitters (LAEs) at z=5.7 and 6.6 on the 13.8 and 21.2 deg{\textasciicircum}2 sky,
respectively, that are identified by the SILVERRUSH program with the
first narrowband imaging data of the Hyper Suprime-Cam (HSC) survey. We
confirm that the LAE catalog is reliable on the basis of 97 LAEs whose
spectroscopic redshifts are already determined by this program and the
previous studies. This catalogue is also available on-line. Based on
this catalogue, we derive the rest-frame Lya equivalent-width
distributions of LAEs at z=5.7 and 6.6 that are reasonably explained by
the exponential profiles with the scale lengths of 72+/-19 and 119+/-4
A, respectively, showing the increase trend towards high-z. We find that
{\textasciitilde}700 LAEs with a large equivalent width (LEW) of {\textgreater}{\textasciitilde} 240 A are
candidates of young-metal poor galaxies and AGNs. We also find that the
fraction of LEW LAEs to all ones is moderately large, {\textasciitilde}30\%. Our LAE
catalog includes 11 Lya blobs (LABs) that are LAEs with spatially
extended Lya emission whose profile is clearly distinguished from those
of stellar objects at the {\textgreater}{\textasciitilde} 3sigma level. The number density of the
LABs at z=6-7 is {\textasciitilde}10{\textasciicircum}\{-7\}-10{\textasciicircum}\{-6\} Mpc-3, being {\textasciitilde}10-100 times lower than
those claimed for LABs at z{\textasciitilde}2-3, suggestive of disappearing LABs at
z{\textgreater}{\textasciitilde}6, albeit with the different selection methods and criteria for
the low and high-z LABs.},
	urldate = {2017-05-11},
	journal = {ArXiv e-prints},
	author = {Shibuya, Takatoshi and Ouchi, Masami and Konno, Akira and Higuchi, Ryo and Harikane, Yuichi and Ono, Yoshiaki and Shimasaku, Kazuhiro and Taniguchi, Yoshiaki and Kobayashi, Masakazu A. R. and Kajisawa, Masaru and Nagao, Tohru and Furusawa, Hisanori and Goto, Tomotsugu and Kashikawa, Nobunari and Komiyama, Yutaka and Kusakabe, Haruka and Lee, Chien-Hsiu and Momose, Rieko and Nakajima, Kimihiko and Tanaka, Masayuki and Wang, Shiang-Yu and Yuma, Suraphong},
	month = apr,
	year = {2017},
	keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
	pages = {arXiv:1704.08140},
}

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First Catalogs and Properties of \\textasciitilde2,000 Lya Emitters and Blobs at z\\textasciitilde6-7 Identified over the 14-21 deg2 Sky","volume":"1704","url":"http://adsabs.harvard.edu/abs/2017arXiv170408140S","abstract":"We present an unprecedentedly large catalog consisting of 2,354 \\textgreater\\textasciitilde L\\textasciicircum* Lya emitters (LAEs) at z=5.7 and 6.6 on the 13.8 and 21.2 deg\\textasciicircum2 sky, respectively, that are identified by the SILVERRUSH program with the first narrowband imaging data of the Hyper Suprime-Cam (HSC) survey. We confirm that the LAE catalog is reliable on the basis of 97 LAEs whose spectroscopic redshifts are already determined by this program and the previous studies. This catalogue is also available on-line. Based on this catalogue, we derive the rest-frame Lya equivalent-width distributions of LAEs at z=5.7 and 6.6 that are reasonably explained by the exponential profiles with the scale lengths of 72+/-19 and 119+/-4 A, respectively, showing the increase trend towards high-z. We find that \\textasciitilde700 LAEs with a large equivalent width (LEW) of \\textgreater\\textasciitilde 240 A are candidates of young-metal poor galaxies and AGNs. We also find that the fraction of LEW LAEs to all ones is moderately large, \\textasciitilde30%. Our LAE catalog includes 11 Lya blobs (LABs) that are LAEs with spatially extended Lya emission whose profile is clearly distinguished from those of stellar objects at the \\textgreater\\textasciitilde 3sigma level. 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