On the Origin of Lyman-α Blobs at High Redshift: Kinematic Evidence for a Hyperwind Galaxy at z = 3.1
Abstract
We present deep optical spectroscopy of an extended Lyα emission-line blob located in an over-dense region at redshift z ≈ 3.1; `blob 1' of Steidel et al. (2000). 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 proto-galaxies 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 of `blob 1' using the Subaru Telescope, and found that its kinematic properties can be well explained in terms of superwind activity.
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