Young Stars Take Their Turn In The Spotlight
ESO´s New Technology Telescope (NTT) has captured a striking image of the open cluster NGC 2100. This brilliant star cluster is around 15 million years old, and located in the Large Magellanic Cloud, a nearby satellite galaxy of the Milky Way. The cluster is surrounded by glowing gas from the nearby Tarantula Nebula.
Observers often overlook NGC 2100 because of its close proximity to the impressive Tarantula Nebula and the super star cluster RMC 136 The glowing gas of the Tarantula Nebula even tries to steal the limelight in this image – the bright colors here are the nebula´s outskirts. This new picture was created from exposures through several different color filters using the EMMI instrument  on the New Technology Telescope at ESO´s La Silla Observatory in Chile. The stars are shown in their natural colors, while light from glowing ionized hydrogen (shown here in red) and oxygen (shown in blue) is overlaid.
The colors that appear in nebulae depend on the temperatures of the stars lighting them up. The hot young stars in the Tarantula Nebula, which lie in the super star cluster RMC 136, are above and to the right of this image, and are powerful enough to cause oxygen to glow  showing up as blue nebulosity in this picture. Below NGC 2100 the red glow indicates either that the outer reaches of the influence of the hot stars of RMC 136 has been reached, or that cooler, and older, stars, that are only able to excite hydrogen are the dominant influence in this region. The stars that make up NGC 2100 are older and less energetic, and hence have little or no nebulosity associated with them.
Star clusters are groups of stars that formed around the same time from a single cloud of gas and dust. The stars with the most mass tend to form in the center of the cluster, while those with less mass dominate the outer regions. This, along with the greater number of stars concentrated in the center, makes the middle of the cluster brighter than the outer regions.
NGC 2100 is an open cluster, which means its stars are relatively loosely bound by gravity. These clusters have a lifespan measured in tens or hundreds of millions of years, as they eventually disperse through gravitational interaction with other bodies. Globular clusters, which look similar to the untrained eye, contain many more older stars and are much more tightly bound, and so have far longer lifespans: many globular clusters have been measured to be almost as old as the Universe itself. So while NGC 2100 might be older than its neighbors in the Large Magellanic Cloud, it is still a youngster by the standards of star clusters.
Data for this image of the under-appreciated young cluster were selected from the depths of ESO´s data archives by Hidden Treasures entrant David Roma as part of the astrophotography competition held by ESO in 2010 .
 EMMI stands for ESO Multi Mode Instrument. It is both a camera for imaging and a spectrograph.
 Most of the glow from oxygen comes from oxygen atoms that have lost two electrons. This strong emission is very common in nebulae but was mysterious to early astronomical spectroscopists and was initially thought to be coming from a new element given the name Nebulium.
 ESO´s Hidden Treasures 2010 competition gave amateur astronomers the opportunity to search through ESO´s vast archives of astronomical data, hoping to find a well-hidden gem that needed polishing by the entrants. To find out more about Hidden Treasures, visit http://www.eso.org/public/outreach/hiddentreasures/.
ESO, the European Southern Observatory, is the foremost intergovernmental astronomy organization in Europe and the world´s most productive astronomical observatory. It is supported by 15 countries: Austria, Belgium, Brazil, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. ESO carries out an ambitious program focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organizing cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world´s most advanced visible-light astronomical observatory and two survey telescopes. VISTA works in the infrared and is the world´s largest survey telescope and the VLT Survey Telescope is the largest telescope designed to exclusively survey the skies in visible light. ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence. ESO is currently planning a 40-meter-class European Extremely Large optical/near-infrared Telescope, the E-ELT, which will become “the world´s biggest eye on the sky”.
Image 1: The brilliant star cluster NGC 2100 lies in the Large Magellanic Cloud, a small satellite galaxy of the Milky Way. This image was taken with the EMMI instrument on the ESO New Technology Telescope (NTT) at the La Silla Observatory in Chile. This star cluster lies close to the Tarantula Nebula and some of the colorful outer parts of the nebula appear in this image. The smaller cluster, close to the right-hand edge of the picture and just below center, is NGC 2092. Credit: ESO
Image 2: This chart shows the location of the brilliant star cluster NGC 2100, within the constellation of Dorado (The Swordfish). This map shows most of the stars visible to the unaided eye under good conditions, and the location of the cluster itself is marked as a red circle. Through a moderate-sized amateur telescope this object appears as a small clump of faint stars. The adjacent green square represents the Tarantula Nebula (NGC 2070). Credit: ESO, IAU and Sky & Telescope
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