AAS 201st Meeting, January, 2003
Session 79. Intergalactic Material: Its Structure and Composition
Poster, Wednesday, January 8, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[79.04] On the Origin of LYMAN\alpha Blobs at High Redshift: Kinematic Evidence for a Hyperwind Galaxy at z = 3.1

Y, Ohyama (Subaru Telescope), Y, Taniguchi (Tohoku Univ., Japan), K. S. Kawabata (NAOJ), Y, Shioya, T. Murayama, T. Nagao (Tohoku Univ., Japan), T. Takata (Subaru Telescope), M. Iye (NAOJ), M. Yoshida (Okayama Astrophysical Observatory, Japan)

We present deep optical spectroscopy of one of the extended Ly\alpha emission-line blobs located in an over-density region at redshift z \approx 3.1; the blob 1 found by Steidel et al. (2000). The origin of such Ly\alpha blobs has been in debate for these years and possible ideas are either a dust-enshrouded, extreme starburst galaxy with a large-scale galactic outflow (superwind) or a proto-galaxy with cooling radiation from dark matter halos. Examination of the kinematical properties of Ly\alpha emission-line gas will allow us to discriminate its nature. Motivated by this, we have performed 3.5 hours optical spectroscopy of the blob 1 using the 8.2 m Subaru Telescope and found that its kinematical properties are well understood in terms of the superwind activity.

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