University of Hertfordshire

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From the same journal

Discovery of a Giant Lyα Emitter Near the Reionization Epoch

Research output: Contribution to journalLiterature review


  • 902444

    Accepted author manuscript, 573 KB, PDF document

  • 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
  • And 7 others
  • M.J. Jarvis
  • Tadayuki Kodama
  • Crystal L. Martin
  • Ross J. McLure
  • Kouji Ohta
  • Toru Yamada
  • Michitoshi Yoshida
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Original languageEnglish
Number of pages12
Pages (from-to)1164-1175
JournalThe Astrophysical Journal
Journal publication date10 May 2009
Publication statusPublished - 10 May 2009


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.


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