Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-01
Astrophys.J. 591 (2003) L9-L12
Astronomy and Astrophysics
Astrophysics
12 pages, including 4 figures, accepted for publication in ApJL
Scientific paper
10.1086/376959
We present deep optical spectroscopy of an extended Ly$\alpha$ emission-line blob located in an over-dense region at redshift $z \approx 3.1$; `blob 1' of Steidel et al. (2000). The origin of such Ly$\alpha$ 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 Ly$\alpha$ 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.
Iye Masanori
Kawabata Koji S.
Murayama Takashi
Nagao Tatsuya
Ohyama Yoichi
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