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Hunting the Southern Skies with SIMBA

August 30, 2001

First Images from the New "Millimetre Camera" on SEST at La Silla

A new instrument, SIMBA ("SEST IMaging Bolometer Array"), has been
installed at the Swedish-ESO Submillimetre Telescope (SEST) at the ESO La
Silla Observatory in July 2001. It records astronomical images at a
wavelength of 1.2 mm and is able to quickly map large sky areas. In order
to achieve the best possible sensitivity, SIMBA is cooled to only 0.3 deg
above the absolute zero on the temperature scale.

SIMBA is the first imaging millimetre instrument in the southern
hemisphere. Radiation at this wavelength is mostly emitted from cold dust
and ionized gas in a variety of objects in the Universe. Among other,
SIMBA now opens exciting prospects for in-depth studies of the "hidden"
sites of star formation, deep inside dense interstellar nebulae. While
such clouds are impenetrable to optical light, they are transparent to
millimetre radiation and SIMBA can therefore observe the associated
phenomena, in particular the dust around nascent stars.

This sophisticated instrument can also search for disks of cold dust
around nearby stars in which planets are being formed or which may be
left-overs of this basic process. Equally important, SIMBA may observe
extremely distant galaxies in the early universe, recording them while
they were still in the formation stage.

Various SIMBA images have been obtained during the first tests of the new
instrument. The first observations confirm the great promise for unique
astronomical studies of the southern sky in the millimetre wavelength
region.

These results also pave the way towards the Atacama Large Millimeter Array
(ALMA), the giant, joint research project that is now under study in
Europe, the USA and Japan.

The full account of this work, with four photos and all weblinks, is
available as ESO PR 20/01 at URL:

http://www.eso.org/outreach/press-rel/pr-2001/pr-20-01.html

European Southern Observatory (ESO)

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