Galaxy formation at high redshifts

Article Abstract:

Deep Field Hubble Space Telescope surveys of the sky using the faintest detection limits provides evidence of the presence of the faint blue galaxies at high redshift. This result is independent of the fact that the universe is either open or at the critical density. The observed data agrees with an open universe model wherein star formation rates decay exponentially with decreasing redshift. The assumption of a flat universe requires the inclusion of a population of galaxies, which are observed only at high redshift. Significantly, the faint blue galaxies seem to be young galaxies.

Usage, Hubble Space Telescope (Artificial satellite)

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Sub-galactic clumps at a redshift of 2.39 and implications for galaxy formation

Article Abstract:

Deep Hubble Space Telescope images of the distant universe reveal five subgalactic-sized clumps at a redshift (z) of 2.39. The Lyman-alpha emission spectra shows that these clumps are a part of a reservoir that gave rise to the present day luminous galaxies. These clumps seem to be star-forming spheroids that may have induced the formation of luminous galaxies through repeated mergers. The space density and velocity dispersion studies agree with Press-Schechter models, and suggest the preferential existence of galaxies in protoclusters at z equivalent to 2.39.

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Clumps and bumps on the road

Article Abstract:

Scientist Masafumi Noguchi's hypothesis on galaxy formation is an attractive one because it is a simple simulation model that describes how a spiral galaxy is derived from a single uniform sphere. A number of galaxy types have been identified and classified using the Hubble telescope. These are illustrated. The question of elliptical evolution is considered.

Research, Noguchi, Masafumi

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