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European Southern Observatory
The European Southern Observatory , is an intergovernmental research organisation for astronomy, composed and supported by thirteen countries from Europe. Created in 1962, to provide state-of-the-art facilities and access to the Southern Sky to European astronomers, it is famous for building and operating some of the largest and most technologically advanced telescopes in the world, such as the New Technology Telescope (NTT), the telescope that pioneered active optics technology, and the VLT (Very Large Telescope), consisting of four 8-meter class telescopes and four 1.8-m Auxiliary Telescopes.
Its numerous observing facilities have made many astronomical discoveries, and produced several astronomical catalogues. Among the more recent are the farthest galaxy ever seen by humans, the Abell 1835 IR1916 galaxy, though this claim seems to be debunked by a series of new articles. In 2005, it obtained the first picture of an extrasolar planet, 2M1207b, orbiting a brown dwarf 173 light-years away.
Facilities
All its observation facilities are located in Chile (hence the name "Southern"), whlile the headquarters are located in Garching near Munich, Germany. ESO operates three major observatories in Chile's Atacama desert:
La Silla Observatory
Paranal Observatory, which hosts the Very Large Telescope
Llano de Chajnantor Observatory, which host the APEX (Atacama_Pathfinder_Experiment) submillimetre telescope and where ALMA, the Atacama Large Millimeter Array, is currently under construction in collaboration with the NSF (USA), the NRC (Canada), and the NAOJ (Japan).
One of the most ambitious ESO projects is the European_Extremely_Large_Telescope, a 42-m telescope, following the concept of an Overwhelmingly Large Telescope (OWL). If built, the E-ELT will be the largest optical/near-infrared telescope in the world.
La Silla
La Silla Observatory hosts eighteen telescopes, albeit most are now closed. Three are still operated by ESO for use by the astronomical community:
MPG/ESO 2.2 m telescope
This telescope is on permanent loan from the Max-Planck-Gesellschaft. Its instrumentation includes the a spectroscope and a wide-field CCD (WFI) imager capable of mapping substantial portions of the sky in a single exposure. In 2007, a third instrument was added, GROND, that takes images simultaneously in seven colours. It will be mostly used to determine distances of gamma-ray bursts [*].
ESO 3.6m Telescope
This conventionally designed horseshoe mount telescope, was mostly used for infrared spectroscopy. It now hosts the HARPS spectrograph, which is devoted to measuring velocities with extreme precision. Values as small as a few cm/s have been obtained. It is thus used especially for the search of extra-solar planets and for asteroseismology. HARPS was used in the discovery of Gliese 581c and Gliese 581d.
New Technology Telescope (NTT)
Although the NTT is almost the same size as the 3.6 m telescope, the use of active optics makes it a higher resolution instrument. The NTT is indeed the first large telescope to be equipped with active optics, a technology developed at ESO, and nowadays used on all major telescopes. The NTT had also, at the time of building, innovative thermal control systems to minimise the telescope and dome seeing.
Other telescopes
Other telescopes present on the La Silla site include three ESO reflectors, two Danish ones, one Dutch refractor, the Swiss Euler telescope, all in the range from 0.5 to 1.5 meter, and the Swedish SEST, 15 m:s submillimeter radio telescope. All these are now decommissioned.
Paranal
The Very Large Telescope (VLT) is the main facility at Paranal. It is composed of four near-identical 8.2-m Unit Telescopes, each hosting two or three instruments, making it certainly the most versatile astronomical facility. The telescopes are named Antu, Kueyen, Melipal and Yepun. The telescopes can also combine their light, in groups of two or three, as an Interferometer. This is the VLTI (Very Large Telescope Interferometer). Four 1.8-m Auxiliary Telescopes (ATs) have been added to the VLTI to make it available when the Unit Telescopes are being used for other projects. These ATs were installed between 2004 and 2007. The first of the Unit Telescopes had its First Light in May 1998 and was offered to the astronomical community on 1 April 1999. The other telescopes followed suit in 1999 and 2000, and the VLT is thus fully operational. Statistics [*] show that in 2007, almost 500 refereed scientific papers were published based on VLT data.
The site also houses the 2.5-m VLT Survey Telescope (VST) and the 4-m VISTA (Visible and Infrared
Survey Telescope for Astronomy) with wide fields of view for surveying large areas of sky uniformly, in the visible and infrared, respectively. First Light for VISTA is foreseen in 2008.
Llano de Chajnantor
Cosmic Background Imager (CBI)
Atacama Pathfinder Experiment (APEX)
Atacama Large Millimeter Array (ALMA)
Member states
Austria is currently in accession negotiations. [*]
The Irish Astronomical Association is currently lobbying the Irish Government for membership.
See also
European Extremely Large Telescope
European Northern Observatory
External links
Webpage for the ESO telescopes at La Silla Observatory
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article European Southern Observatory
