Picture of the Week

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potw0914-en-us — Picture of the Week
Paranal Observatory and the Volcano Llullaillaco*
14 April 2009: This marvellous aerial photograph of the home of ESO’s Very Large Telescope (VLT), fully demonstrates the superb quality of the observing site. In the foreground we see the Paranal Observatory, located at an altitude of 2,600 metres on mount Paranal in Chile. In the background we can see the snow-capped, 6,720 meter-high volcano Llullaillaco, located a mind-boggling 190 km further East on the Argentinean border. This image is a testimony of the magnificent quality of the air and the ideal conditions for observing at this remote site. Clearly visible in the image are the domes of the four giant 8.2-metre Unit Telescopes of the VLT, with the Control Building, where astronomers carry out the observations, in the foreground. Taken several years ago, this photograph does not show the Auxiliary Telescopes nor the dome of the soon to come VST Survey Telescope. #L
potw0913-en-us — Picture of the Week
Messier 100 and Supernova SN 2006X
1 April 2009: Similar in appearance to our own Milky Way, Messier 100 is a grand spiral galaxy that presents an intricate structure, with a bright core and two prominent arms. The galaxy harbours numerous young and hot massive stars as well as extremely hot regions of ionised hydrogen. Two smaller arms are seen emerging from the centre and reaching towards the larger spiral arms. The galaxy, located 60 million light-years away, is slightly larger than the Milky Way, with a diameter of about 120,000 light-years. A supernova was discovered in M100 on 4 February 2006. Named SN 2006X, it is the 5th supernova to have been found in M100 since 1900. This image is based on data acquired with the 1.5 m Danish telescope at the ESO La Silla Observatory in Chile, through three filters (B: 1390 s, V: 480 s, R: 245 s). The supernova is the brighter of the two ...
potw0912-en-us — Picture of the Week
The Paranal Residencia at Night
30 March 2009: Night view of the Paranal Observatory, obtained on 21 March 2009. The Residencia — the place where staff can eat and sleep — is visible in the foreground, while one can distinguish the 8.2-metre Unit Telescopes of ESO’s Very Large Telescope in the higher background. Yepun, the Unit Telescope no. 4, is seen using the laser guide star to assist the adaptive optics instruments on the VLT. This allows astronomers to obtain images free from the blurring effect of the atmosphere, regardless of the brightness and location on the sky of the observed target. The image shows the great value of the dark night sky above Paranal. The band of the Milky Way is running through the image vertically. Orion and the Orion Nebula can be seen in the upper left corner along with a number of other interesting deep-sky objects in Auriga, the Charioteer. Tremendous efforts are being put ...
potw0911-en-us — Picture of the Week
The Tarantula Nebula
23 March 2009: Located inside the Large Magellanic Cloud (LMC) – one of our closest galaxies – in what some describe as a frightening sight, the Tarantula nebula is worth looking at in detail. Also known as 30 Doradus or NGC 2070, the nebula owes its name to the arrangement of its bright patches that somewhat resemble the legs of a tarantula. Taking the name of one of the biggest spiders on Earth is very fitting in view of the gigantic proportions of this celestial nebula — it measures nearly 1,000 light years across ! Its proximity, the favourable inclination of the LMC, and the absence of intervening dust make this nebula one of the best laboratories to better understand the formation of massive stars. This spectacular nebula is energised by an exceptionally high concentration of massive stars, often referred to as super star clusters. This image is based on data acquired with ...
potw0909-en-us — Picture of the Week
First Light for the Active Phasing Experiment — a step towards the E-ELT
9 March 2009: The 40-metre-class primary mirror of the European Extremely Large Telescope (E-ELT) will be composed of 984 individual segments, which must be aligned with incredible precision. The position of the individual hexagonal mirrors needs to be controlled with nanometre precision (1 nanometre is 1 millionth of a mm). This can only be achieved with the help of new technologies and a prototype component for this high-tech alignment of segmented mirrors is seen in this image. The so-called Active Phasing Experiment achieved its First Light during the night of 6 December 2008 on the visitor focus of Melipal, one of the 8.2 m Unit Telescopes of ESO’s Very Large Telescope at Paranal. Made in collaboration with several European partners, the current active segmented mirror is composed of 61 hexagonal segments. You can move around the experiment in this Quicktime VTR animation.
potw0908-en-us — Picture of the Week
The Sombrero Galaxy
2 March 2009: One of most famous spiral galaxies is Messier 104, widely known as the "Sombrero" (the Mexican hat) because of its particular shape. It is located towards the constellation Virgo (the ‘virgin’), at a distance of about 30 million light-years and is the 104th object in the famous catalogue of deep-sky objects by French astronomer Charles Messier (1730 - 1817).This luminous and massive galaxy has a total mass of about 800 billion suns, and is notable for its dominant nuclear bulge, composed mainly of mature stars, and its nearly edge-on disc composed of stars, gas, and dust. The complexity of this dust is apparent directly in front of the bright nucleus, but is also evident in the dark absorbing lanes throughout the disc. A large number of small, diffuse objects can be seen as a swarm in the halo of Messier 104. Most of these are globular clusters, similar to those ...
potw0906-en-us — Picture of the Week
Cosmic Butterfly
16 February 2009: The Bug Nebula, NGC 6302, is one of the brightest and most extreme planetary nebulae known. It is located about 4,000 light-years away, towards the Scorpius constellation (the Scorpion). The nebula is the swansong of a dying solar-like star lying at its centre. At about 250,000 degrees Celsius and smothered in a blanket of hailstones, the star itself has never been observed as it is surrounded by a dense disc of gas and dust, opaque to light. This dense disc may be the origin of the hourglass structure of the nebula. This colour image, which nicely highlights the complex structure of the nebula, is a composite of three exposures through blue, green and red filters. It was made using the 1.5-metre Danish telescope at the ESO La Silla Observatory, Chile.
potw0905-en-us — Picture of the Week
Beautiful Sky over Paranal *
9 February 2009: This image, taken an early morning two weeks ago, shows with great clarity the amazing sky over Paranal, the home of ESO’s Very Large Telescope (VLT) in Chile. The wonderful landscape of the Milky Way hangs in all its glory above three of the four 1.8-metre VLT Auxiliary Telescopes (ATs). They observe simultaneously, using interferometry to get a vision as sharp as if they used a telescope with a diameter equal to the largest distance between the telescopes, in this case, 48 metres. Because the larger 8.2-metre Unit Telescopes of the VLT are usually used individually, the four ATs have been added to the system to make full use of the interferometric laboratory. Facing the East, the remarkable photo shows the constellations Ophiuchus (the ‘snake-holder’), Sagittarius (the ‘archer’), Scorpius (the ‘scorpion’), and Triangulum Australe (the ‘southern triangle’). The Centre of the Milky Way is just below the centre of the ...
potw0904-en-us — Picture of the Week
Ballet of Interacting Galaxies
2 February 2009: The pair of galaxies NGC 1531/2, engaged in a spirited waltz, is located about 70 million light-years away towards the southern constellation Eridanus (The River). The deformed foreground spiral galaxy laced with dust lanes NGC 1532 is so close to its companion — the background galaxy with a bright core just above the centre of NGC 1532 — that it gets distorted: one of its spiral arms is warped and plumes of dust and gas are visible above its disc. The cosmic dance leads to another dramatic effect: a whole new generation of massive stars were born in NGC 1532 because of the interaction. They are visible as the purple objects in the spiral arms. This exquisite image was made using the 1.5-metre Danish telescope at the ESO La Silla Observatory, Chile. It is based on data obtained through three different filters: B, V and R. The field of view ...
potw0903-en-us — Picture of the Week
Cleaning a VLT mirror
26 January 2009: The 8.2m diameter main mirror of Antu, the first Unit Telescope of ESO's Very Large Telescope, is being cleaned using carbon dioxide snow. While the telescope enclosure is maintained extremely clean, the mirrors are exposed to the elements during the observations. Consequently, dust from the desert slowly accumulates over the surface of the mirror, making it less reflective over time. The mirror's surface is so delicate that normal cleaners used for household mirrors are not appropriate for telescopes. Observatories have developed other methods, such as this one using carbon dioxide snow. The tiny CO2 snowflakes in the white plume have a temperature of almost minus 80 degrees Celsius; when they land on the mirror, which is at room temperature, they cause minuscule 'explosions' that detach the dust grains from the surface. The dust then floats away, leaving the mirror clean. The process is nevertheless very delicate: should Alain Gilliotte, the ...
potw0901-en-us — Picture of the Week
The Trapezium Cluster
12 January 2009: The Orion Nebula is arguably the finest of all nebulae within the Milky Way visible from the Northern Hemisphere. With a gaseous repository of 10,000 suns, and illuminated by a cluster of hot young stars, the clouds of Messier 42 — as it is also known — glow with fantastic colours and shapes, giving us a bird’s eye view of one of the greatest star forming nurseries in our part of the Milky Way. Messier 42 is a complex of glowing gas, mostly hydrogen but also helium, carbon, nitrogen, and oxygen in decreasing amounts, located 1,500 light-years away. At its very heart, we find the Trapezium, a group of four very hot stars that illuminate the nebula. They are the brightest of an extended cluster of several thousand young stars many of which lie unseen within the opaque gas and dust. Amazingly, whilst the Orion Nebula is easy to identify ...
potw0834-en-us — Picture of the Week
Spiral Galaxy NGC 1232
15 December 2008: The striking, large spiral galaxy NGC 1232, and its distorted companion shaped like the greek letter "theta". The pair is located roughly 70 million light-years away in the constellation Eridanus (The River). Billions of stars and dark dust are caught up in this beautiful gravitational swirl. The blue spiral arms with their many young stars and star-forming regions make a striking contrast with the yellow-reddish core of older stars. This image is based on data acquired with the 1.5 m Danish telescope at the ESO La Silla Observatory in Chile, through three filters (B: 900 s, V: 400 s, R: 400 s). East is up, North is to the left.
potw0833-en-us — Picture of the Week
ESO helps school to get a bus
8 December 2008: About a year ago, ESO kindly agreed to donate a surplus van to the Colegio Hellen Keller, a school for children with visual disabilities, located in Santiago, Chile. The school was in desperate need of some form of transport as there were many children who could either not attend school at all, or had to spend the weekdays away from their family, simply because they could not make the daily journey on public transport, due to their disabilities. The initial idea was to donate one of the bus used to carry staff to Paranal. However, it became clear that this big van was not ideal for the school, especially with rising fuel prices. ESO kindly offered to donate the proceeds from the sale of the van instead, which was in excess of 4.000.000 Chilean Pesos (about 5,000 EUR). The school set up a fund to raise the rest of the ...
potw0832-en-us — Picture of the Week
SN2008bk: The last moments of a star
1 December 2008: Supernova 2008bk in the spiral galaxy NGC 7793 was discovered at the end of March 2008 by amateur astronomer Berto Monard from South Africa. The galaxy is 13 million light-years away in the direction of Sculptor constellation. This supernova is a typical example of a massive star that exploded at the end of its life. But this time, the astronomers were able not only to see the explosion, but to precisely pinpoint the star that exploded, a rather rare achievement. This was made possible because the explosion site had been observed several times with the help of ESO's Very Large Telescope, the latest images having been observed only a few months before the explosion with the new HAWK-I instrument. An European team of astronomers, led by Seppo Mattila of University of Turku, Finland, then observed the explosion site again two months after the supernova's discovery, this time with the VLT's ...
potw0831-en-us — Picture of the Week
Sunset over Paranal Panorama *
25 November 2008: Le Very Large Telescope (VLT) on the 2600-metre-high Cerro Paranal is ESOs premier site for observations in the visible and infrared light. It is located in the Chilean Atacama desert. All four unit telescopes of 8.2-metre diameter are individually in operation with a large collection of instruments and have already made amazing scientific discoveries.The VLT offers also the possibility of combining coherently the light from the four UTs to work as an interferometer. The Very Large Telescope Interferometer (VLTI), with its own suite of instruments, ultimately providing imagery at the milli-arcsecond level as well as astrometry at 10 micro-arcsecond precision. In addition to the 8.2-metre diameter telescopes, the VLTI is complemented with four Auxiliary Telescopes (AT) of 1.8-metre diameter to improve its imaging capabilities and enable full nighttime use on a year-round basis.The enclosure of the yet to come VLT Survey Telescope (2.6-metre diameter) is visible in the centre of ...
potw0830-en-us — Picture of the Week
The Carina Nebula
11 November 2008: The Carina Nebula is a large bright nebula that surrounds several clusters of stars. It contains two of the most massive and luminous stars in our Milky Way galaxy, Eta Carinae and HD 93129A. Located 7500 light years away, the nebula itself spans some 260 light years across, about 7 times the size of the Orion Nebula, and is shown in all its glory in this mosaic. It is based on images collected with the 1.5-m Danish telescope at ESO's La Silla Observatory. Being brighter than one million Suns, Eta Carinae (the brightest star in this image) is the most luminous star known in the Galaxy, and has most likely a mass over 100 times that of the Sun. It is the closest example of a luminous blue variable, the last phase in the life of a very massive star before it explodes in a fiery supernova. Eta Carinae is ...
potw0829-en-us — Picture of the Week
Gone with the Wind
4 November 2008: M1-67 is the youngest wind-nebula around a Wolf-Rayet star, called WR124, in our Galaxy. These Wolf-Rayet stars start their lives with dozens of times the mass of our Sun, but loose most of it through a powerful wind, which is ultimately responsible for the formation of the nebula. Ten years ago, Hubble Space Telescope observations revealed a wealth of small knots and substructures inside the nebula. The same team, led by Cédric Foellmi (ESO), has now used ESO's Very Large Telescope (VLT) to watch how these structures have evolved and what they can teach us about stellar winds, their chemistry, and how they mix with the surrounding interstellar medium, before the star will eventually blow everything away in a fiery supernova explosion. The image is based on FORS1 data obtained by the Paranal Science team with the VLT through 2 wide (B and V) and 3 narrow-band filters.
potw0827-en-us — Picture of the Week
Milky Way above Paranal
30 September 2008: A night of work for the Paranal Observatory, in the Chilean Atacama Desert. This picture, taken on 20 September, shows the incredible beauty of the night sky above the most advanced telescope in the world, ESO's Very Large Telescope. The Milky Way is clearly seen in this superb image. 
potw0826-en-us — Picture of the Week
Magnificent Spiral Galaxy NGC 7424
22 September 2008: Composite colour-coded image of another magnificent spiral galaxy, NGC 7424, at a distance of 40 million light-years. It is based on images obtained with the multi-mode VIMOS instrument on the ESO Very Large Telescope (VLT) in three different wavelength bands. The image covers 6.5 x 7.2 square arcminutes on the sky. North is up and East is to the right. Read more about this superb object in the ESO Press Release eso0436.
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