VLT finds most distant known galaxy
EUROPEAN SOUTHERN OBSERVATORY
Posted: March 1, 2004
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This
is an ISAAC image in the near-infrared of the core of the lensing
cluster Abell 1835 (upper) with the location of the galaxy Abell 1835
IR1916 (white circle). The thumbnail images at the bottom show the
images of the remote galaxy in the visible R-band (HST-WPC image)
and in the J-, H-, and K-bands. The fact that the galaxy is not detected
in the visible image but present in the others — and more so
in the H-band — is an indication that this galaxy has a redshift
around 10.
Image credit: ESO |
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Using the ISAAC near-infrared instrument on ESO's Very Large
Telescope, and the magnification effect of a gravitational
lens, a team of French and Swiss astronomers has found several
faint galaxies believed to be the most remote known.
Further spectroscopic studies of one of these candidates has
provided a strong case for what is now the new record holder
— and by far — of the most distant galaxy known
in the Universe.
Named Abell 1835 IR1916, the newly discovered galaxy has
a redshift of 10 and is located about 13,230 million light-years
away. It is therefore seen at a time when the Universe was
merely 470 million years young, that is, barely 3 percent
of its current age.
This primeval galaxy appears to be ten thousand times less
massive than our Galaxy, the Milky Way. It might well be among
the first class of objects which put an end to the Dark Ages
of the Universe.
This remarkable discovery illustrates the potential of large
ground-based telescopes in the near-infrared domain for the
exploration of the very early Universe. |
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