Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.arcetri.astro.it/~palla/ANDREAIMMAGINI/Cosmologia/Deepest.txt Дата изменения: Sat Apr 7 20:35:29 2001 Дата индексирования: Sat Dec 22 08:49:20 2007 Кодировка: Поисковые слова: spiral galaxy

EMBARGOED UNTIL: 11:00 A.M. (EDT) October 8, 1998

PHOTO NO.: STScI-PRC98-32a

HUBBLE'S DEEPEST VIEW OF THE UNIVERSE

[Left]
A NASA Hubble Space Telescope view of the faintest galaxies ever seen in
the universe, taken in infrared light with the Near Infrared Camera and
Multi-Object Spectrometer (NICMOS).

The picture contains over 300 galaxies having spiral, elliptical and
irregular shapes. Though most of these galaxies were first seen in 1995
when Hubble was used to take a visible-light deep exposure of the same
field, NICMOS uncovers many new objects. Most of these objects are too
small and faint to be apparent in the full field NICMOS view.

Some of the reddest and faintest of the newly detected objects may be
over 12 billion light-years away, as derived from a standard model of
the universe. However, a powerful new generation of telescopes will be
needed to confirm the suspected distances of these objects.

The field of view is 2 million light-years across, at its maximum. Yet,
on a cosmic scale, it represents only a thin pencil beam look across the
universe. The area of sky is merely 1/100th the apparent diameter on
the full moon.

[Right]
Two close-up NICMOS views of candidate objects which may be over 12
billion light-years away. Each candidate is centered in the frame. The
reddish color may mean all of the starlight has been stretched to
infrared wavelengths by the universe's expansion. Alternative
explanations are that the objects are closer to us, but the light has
been reddened by dust scattering. A new generation of telescopes will be
needed to make follow-up observations capable of establishing true
distance.

The image was taken in January 1998 and required an exposure time of 36
hours to detect objects down to 30th magnitude. Hubble was aimed in the
direction of the constellation Ursa Major, in a region just above the
handle of the Big Dipper. The color corresponds to blue (0.45 microns),
green (1.1 microns) and red (1.6 microns).

Credit: Rodger I. Thompson (University of Arizona), and NASA