Discovery of a Giant Lyα Emitter Near the Reionization Epoch

Masami Ouchi; Yoshiaki Ono; Eiichi Egami; Tomoki Saito; Masamune Oguri; Patrick J. McCarthy; Duncan Farrah; Nobunari Kashikawa; Ivelina Momcheva; Kazuhiro Shimasaku; Kouichiro Nakanishi; Hisanori Furusawa; Masayuki Akiyama; James S. Dunlop; Angela M. J. Mortier; Sadanori Okamura; Masao Hayashi; Michele Cirasuolo; Alan Dressler; Masanori Iye; M.J. Jarvis; Tadayuki Kodama; Crystal L. Martin; Ross J. McLure; Kouji Ohta; Toru Yamada; Michitoshi Yoshida

doi:10.1088/0004-637X/696/2/1164

Discovery of a Giant Lyα Emitter Near the Reionization Epoch

Masami Ouchi, Yoshiaki Ono, Eiichi Egami, Tomoki Saito, Masamune Oguri, Patrick J. McCarthy, Duncan Farrah, Nobunari Kashikawa, Ivelina Momcheva, Kazuhiro Shimasaku, Kouichiro Nakanishi, Hisanori Furusawa, Masayuki Akiyama, James S. Dunlop, Angela M. J. Mortier, Sadanori Okamura, Masao Hayashi, Michele Cirasuolo, Alan Dressler, Masanori IyeM.J. Jarvis, Tadayuki Kodama, Crystal L. Martin, Ross J. McLure, Kouji Ohta, Toru Yamada, Michitoshi Yoshida

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Abstract

We report the discovery of a giant Lyα emitter (LAE) with a Spitzer/Infrared Array Camera (IRAC) counterpart near the reionization epoch at z = 6.595. The giant LAE is found from the extensive 1 deg2 Subaru narrowband survey for z = 6.6 LAEs in the Subaru/XMM-Newton Deep Survey (SXDS) field, and subsequently identified by deep spectroscopy of Keck/DEIMOS and Magellan/IMACS. Among our 207 LAE candidates, this LAE is not only the brightest narrowband object with L(Lyα) = 3.9 ± 0.2 × 1043 erg s–1 in our survey volume of 106 Mpc3, but also a spatially extended Lyα nebula with the largest isophotal area whose major axis is at least 3''. This object is more likely to be a large Lyα nebula with a size of 17 kpc than to be a strongly lensed galaxy by a foreground object. Our Keck spectrum with medium-high spectral and spatial resolutions suggests that the velocity width is v FWHM = 251 ± 21 km s–1, and that the line-center velocity changes by 60 km s–1 in a 10 kpc range. The stellar mass and star formation rate are estimated to be 0.9-5.0 × 1010 M and >34 M yr–1, respectively, from the combination of deep optical to infrared images of Subaru, UKIDSS-Ultra Deep Survey, and Spitzer/IRAC. Although the nature of this object is not yet clearly understood, this could be an important object for studying cooling clouds accreting onto a massive halo, or forming-massive galaxies with significant outflows contributing to cosmic reionization and metal enrichment of intergalactic medium.

Original language	English
Pages (from-to)	1164-1175
Number of pages	12
Journal	The Astrophysical Journal
Volume	696
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/696/2/1164
Publication status	Published - 10 May 2009

Keywords

galaxies: formation
galaxies: high redshift
cosmology: observations

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10.1088/0004-637X/696/2/1164

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‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society
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Ouchi, M., Ono, Y., Egami, E., Saito, T., Oguri, M., McCarthy, P. J., Farrah, D., Kashikawa, N., Momcheva, I., Shimasaku, K., Nakanishi, K., Furusawa, H., Akiyama, M., Dunlop, J. S., Mortier, A. M. J., Okamura, S., Hayashi, M., Cirasuolo, M., Dressler, A., ... Yoshida, M. (2009). Discovery of a Giant Lyα Emitter Near the Reionization Epoch. The Astrophysical Journal, 696(2), 1164-1175. https://doi.org/10.1088/0004-637X/696/2/1164

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title = "Discovery of a Giant Lyα Emitter Near the Reionization Epoch",

abstract = "We report the discovery of a giant Lyα emitter (LAE) with a Spitzer/Infrared Array Camera (IRAC) counterpart near the reionization epoch at z = 6.595. The giant LAE is found from the extensive 1 deg2 Subaru narrowband survey for z = 6.6 LAEs in the Subaru/XMM-Newton Deep Survey (SXDS) field, and subsequently identified by deep spectroscopy of Keck/DEIMOS and Magellan/IMACS. Among our 207 LAE candidates, this LAE is not only the brightest narrowband object with L(Lyα) = 3.9 ± 0.2 × 1043 erg s–1 in our survey volume of 106 Mpc3, but also a spatially extended Lyα nebula with the largest isophotal area whose major axis is at least 3''. This object is more likely to be a large Lyα nebula with a size of 17 kpc than to be a strongly lensed galaxy by a foreground object. Our Keck spectrum with medium-high spectral and spatial resolutions suggests that the velocity width is v FWHM = 251 ± 21 km s–1, and that the line-center velocity changes by 60 km s–1 in a 10 kpc range. The stellar mass and star formation rate are estimated to be 0.9-5.0 × 1010 M and >34 M yr–1, respectively, from the combination of deep optical to infrared images of Subaru, UKIDSS-Ultra Deep Survey, and Spitzer/IRAC. Although the nature of this object is not yet clearly understood, this could be an important object for studying cooling clouds accreting onto a massive halo, or forming-massive galaxies with significant outflows contributing to cosmic reionization and metal enrichment of intergalactic medium.",

keywords = "galaxies: formation, galaxies: high redshift, cosmology: observations",

author = "Masami Ouchi and Yoshiaki Ono and Eiichi Egami and Tomoki Saito and Masamune Oguri and McCarthy, {Patrick J.} and Duncan Farrah and Nobunari Kashikawa and Ivelina Momcheva and Kazuhiro Shimasaku and Kouichiro Nakanishi and Hisanori Furusawa and Masayuki Akiyama and Dunlop, {James S.} and Mortier, {Angela M. J.} and Sadanori Okamura and Masao Hayashi and Michele Cirasuolo and Alan Dressler and Masanori Iye and M.J. Jarvis and Tadayuki Kodama and Martin, {Crystal L.} and McLure, {Ross J.} and Kouji Ohta and Toru Yamada and Michitoshi Yoshida",

note = "{\textquoteleft}In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.{\textquoteright} Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society",

year = "2009",

month = may,

day = "10",

doi = "10.1088/0004-637X/696/2/1164",

language = "English",

volume = "696",

pages = "1164--1175",

journal = "The Astrophysical Journal",

issn = "0004-637X",

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number = "2",

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Ouchi, M, Ono, Y, Egami, E, Saito, T, Oguri, M, McCarthy, PJ, Farrah, D, Kashikawa, N, Momcheva, I, Shimasaku, K, Nakanishi, K, Furusawa, H, Akiyama, M, Dunlop, JS, Mortier, AMJ, Okamura, S, Hayashi, M, Cirasuolo, M, Dressler, A, Iye, M, Jarvis, MJ, Kodama, T, Martin, CL, McLure, RJ, Ohta, K, Yamada, T & Yoshida, M 2009, 'Discovery of a Giant Lyα Emitter Near the Reionization Epoch', The Astrophysical Journal, vol. 696, no. 2, pp. 1164-1175. https://doi.org/10.1088/0004-637X/696/2/1164

TY - JOUR

T1 - Discovery of a Giant Lyα Emitter Near the Reionization Epoch

AU - Ouchi, Masami

AU - Ono, Yoshiaki

AU - Egami, Eiichi

AU - Saito, Tomoki

AU - Oguri, Masamune

AU - McCarthy, Patrick J.

AU - Farrah, Duncan

AU - Kashikawa, Nobunari

AU - Momcheva, Ivelina

AU - Shimasaku, Kazuhiro

AU - Nakanishi, Kouichiro

AU - Furusawa, Hisanori

AU - Akiyama, Masayuki

AU - Dunlop, James S.

AU - Mortier, Angela M. J.

AU - Okamura, Sadanori

AU - Hayashi, Masao

AU - Cirasuolo, Michele

AU - Dressler, Alan

AU - Iye, Masanori

AU - Jarvis, M.J.

AU - Kodama, Tadayuki

AU - Martin, Crystal L.

AU - McLure, Ross J.

AU - Ohta, Kouji

AU - Yamada, Toru

AU - Yoshida, Michitoshi

N1 - ‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society

PY - 2009/5/10

Y1 - 2009/5/10

N2 - We report the discovery of a giant Lyα emitter (LAE) with a Spitzer/Infrared Array Camera (IRAC) counterpart near the reionization epoch at z = 6.595. The giant LAE is found from the extensive 1 deg2 Subaru narrowband survey for z = 6.6 LAEs in the Subaru/XMM-Newton Deep Survey (SXDS) field, and subsequently identified by deep spectroscopy of Keck/DEIMOS and Magellan/IMACS. Among our 207 LAE candidates, this LAE is not only the brightest narrowband object with L(Lyα) = 3.9 ± 0.2 × 1043 erg s–1 in our survey volume of 106 Mpc3, but also a spatially extended Lyα nebula with the largest isophotal area whose major axis is at least 3''. This object is more likely to be a large Lyα nebula with a size of 17 kpc than to be a strongly lensed galaxy by a foreground object. Our Keck spectrum with medium-high spectral and spatial resolutions suggests that the velocity width is v FWHM = 251 ± 21 km s–1, and that the line-center velocity changes by 60 km s–1 in a 10 kpc range. The stellar mass and star formation rate are estimated to be 0.9-5.0 × 1010 M and >34 M yr–1, respectively, from the combination of deep optical to infrared images of Subaru, UKIDSS-Ultra Deep Survey, and Spitzer/IRAC. Although the nature of this object is not yet clearly understood, this could be an important object for studying cooling clouds accreting onto a massive halo, or forming-massive galaxies with significant outflows contributing to cosmic reionization and metal enrichment of intergalactic medium.

AB - We report the discovery of a giant Lyα emitter (LAE) with a Spitzer/Infrared Array Camera (IRAC) counterpart near the reionization epoch at z = 6.595. The giant LAE is found from the extensive 1 deg2 Subaru narrowband survey for z = 6.6 LAEs in the Subaru/XMM-Newton Deep Survey (SXDS) field, and subsequently identified by deep spectroscopy of Keck/DEIMOS and Magellan/IMACS. Among our 207 LAE candidates, this LAE is not only the brightest narrowband object with L(Lyα) = 3.9 ± 0.2 × 1043 erg s–1 in our survey volume of 106 Mpc3, but also a spatially extended Lyα nebula with the largest isophotal area whose major axis is at least 3''. This object is more likely to be a large Lyα nebula with a size of 17 kpc than to be a strongly lensed galaxy by a foreground object. Our Keck spectrum with medium-high spectral and spatial resolutions suggests that the velocity width is v FWHM = 251 ± 21 km s–1, and that the line-center velocity changes by 60 km s–1 in a 10 kpc range. The stellar mass and star formation rate are estimated to be 0.9-5.0 × 1010 M and >34 M yr–1, respectively, from the combination of deep optical to infrared images of Subaru, UKIDSS-Ultra Deep Survey, and Spitzer/IRAC. Although the nature of this object is not yet clearly understood, this could be an important object for studying cooling clouds accreting onto a massive halo, or forming-massive galaxies with significant outflows contributing to cosmic reionization and metal enrichment of intergalactic medium.

KW - galaxies: formation

KW - galaxies: high redshift

KW - cosmology: observations

U2 - 10.1088/0004-637X/696/2/1164

DO - 10.1088/0004-637X/696/2/1164

M3 - Literature review

SN - 0004-637X

VL - 696

SP - 1164

EP - 1175

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

ER -

Discovery of a Giant Lyα Emitter Near the Reionization Epoch

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Keywords

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