Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-20
J.Korean Astron.Soc. 36 (2003) 1
Astronomy and Astrophysics
Astrophysics
23 pages, 12 figures, jkas35.sty. To appear in the proceedings of the APCTP WoFormation and Interaction of Galaxies, edited by
Scientific paper
The 8m class telescopes in the ground-based optical astronomy together with help from the ultra-sharp eye of the Hubble Space Telescope have enabled us to observe forming galaxies beyond redshift $z=5$. In particular, more than twenty Ly$\alpha$-emitting galaxies have already been found at $z > 5$. These findings provide us with useful hints to investigate how galaxies formed and then evolved in the early universe. Further, detailed analysis of Ly$\alpha$ emission line profiles are useful in exploring the nature of the intergalactic medium because the trailing edge of cosmic reionization could be close to $z \sim 6$ -- 7, at which forming galaxies have been found recently. We also discuss the importance of superwinds from forming galaxies at high redshift, which has an intimate relationship between galaxies and the intergalactic medium. We then give a review of early cosmic star formation history based on recent progress in searching for Ly$\alpha$-emitting young galaxies beyond redshift 5.
Ajiki Masaru
Fujita Shinobu S.
Murayamaoya Takashi
Nagao Tohru
Shioya Yasuhiro
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