On the origin of Lyα blobs at high redshift: Kinematic evidence of a hyperwind galaxy at z = 3.1

Youichi Ohyama, Yoshiaki Taniguchi, Koji S. Kawabata, Yasuhiro Shioya, Takashi Murayama, Tohru Nagao, Tadafumi Takata, I. Y.E. Masanori, Michitoshi Yoshida

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44 Citations (Scopus)

Abstract

We present deep optical spectroscopy of an extended Lyα emission-line blob located in an overdense region at redshift z ≈ 3.1 ("blob 1" of Steidel et al.). The origin of such Lyα blobs has been debated for some time; two of the most plausible models are (1) that it comes from a dust-enshrouded, extreme starburst galaxy with a large-scale galactic outflow (superwind/hyperwind) or (2) that it is the cooling radiation of protogalaxies in dark matter halos. Examination of the kinematic properties of the Lyα emission-line gas should allow us to determine its nature. With this motivation, we performed optical spectroscopy on blob 1 using the Subaru Telescope and found that its kinematic properties can be well explained in terms of superwind activity.

Original languageEnglish
Pages (from-to)L9-L12
JournalAstrophysical Journal
Volume591
Issue number1 II
DOIs
Publication statusPublished - 2003 Jul 1

Keywords

  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ohyama, Y., Taniguchi, Y., Kawabata, K. S., Shioya, Y., Murayama, T., Nagao, T., Takata, T., Masanori, I. Y. E., & Yoshida, M. (2003). On the origin of Lyα blobs at high redshift: Kinematic evidence of a hyperwind galaxy at z = 3.1. Astrophysical Journal, 591(1 II), L9-L12. https://doi.org/10.1086/376959