The discovery of a galaxy-wide superwind from a young massive galaxy at redshift z approximately equal to 3

Article Abstract:

Two dimensional spectroscopy of a star-forming galaxy at redshift z = 3.09 is presented and its spatially extended Lyalpha line emission appears to be absorbed by H1 in a foreground screen covering the entire galaxy, with a lateral extent of at least 100 kpc and remarkable velocity coherence. This screen was ejected from the galaxy during a starburst several 10(super 8) years earlier and has subsequently swept up gas from the surrounding intergalactic medium and cooled.

United States, Outer space, Space exploration

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The inevitable youthfulness of known high-redshift radio galaxies

Article Abstract:

Radio galaxies have extensive lobes of emission driven by plasma jets, and some can be observed at very high redshifts. It is shown that for any model of radio-galaxy evolution where luminosity falls with time, following an initial rapid rise, each observable high-redshift radio galaxy must be seen when the lobes are less than 10(super7) years old. High-redshift radio galaxies can thus act as high-time-resolution probes of evolution in the early Universe.

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Journey to the birth of the universe

Article Abstract:

Astronomers in September 2006 have announced the discovery of the most distant galaxy yet seen from Earth, which provides fresh clues about the early history of the Universe, and seize a many contested record. The new galaxy, dubbed IOK-1, is so far away that the light by which it was detected was emitted only 750 million years after the Universe was born.

Japan, Observatories, Astronomical observatories, Alpha rays, Alpha particles

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