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Paper: Galaxy Formation and Evolution Probed with Lyman-α blobs
Volume: 399, Panoramic Views of Galaxy Formation and Evolution
Page: 280
Authors: Saito, T.; Shimasaku, K.; Okamura, S.; Ouchi, M.; Akiyama, M.; Yoshida, M.; Ueda, Y.
Abstract: Spatially extended Lyman-α sources that are faint and/or compact in ultraviolet continuum (Lyman-α blobs, LABs) are excellent probes for very early phases of galaxy formation. We have carried out an unbiased survey with Subaru/Suprime-Cam and seven intermediate-band filters, covering z ∼ 3 − 5. We have constructed a sample of 41 LABs, proving that they are common in the early universe. Follow-up spectroscopy with VLT/VIMOS suggests that some fraction of our LABs are likely to be ordinary starbursts (∼ 50%) or superwind galaxies (∼ 30%). Excluding these sources, ∼ 40% of our spectroscopic sample clearly shows positive correlation between the Lyman-α luminosity and the velocity width. These results suggests that our sample may contain a large number of proto-galaxies in the very first stage of their assembly.
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