VST Images Galaxy Blooming With New Stars
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VLT Survey Telescope snaps wide-field view of NGC 253
The VLT Survey Telescope (VST) has captured the beauty of the nearby spiral galaxy NGC 253. The new portrait is probably the most detailed wide-field view of this object and its surroundings ever taken. It demonstrates that the VST, the newest telescope at ESO’s Paranal Observatory, provides broad views of the sky while also offering impressive image sharpness.
NGC 253 gleams about eleven and a half million light-years away in the southern constellation of Sculptor. It is often just called the Sculptor Galaxy, although other descriptive names include the Silver Coin or Silver Dollar Galaxy. It is easy to get a good look at NGC 253 through binoculars as it is one of the brightest galaxies in the sky after the Milky Way’s closest, big galactic neighbor, the Andromeda Galaxy.
Astronomers have noted the widespread active star formation in NGC 253 and labeled it a “starburst” galaxy . The many bright clumps dotting the galaxy are stellar nurseries where hot young stars have just ignited. The radiation streaming from these giant blue-white babies makes the surrounding hydrogen gas clouds glow brightly (green in this image).
This nearby spiral galaxy was discovered by the German—British astronomer Caroline Herschel, the sister of the famed astronomer William Herschel, as she searched for comets in 1783. The Herschels would have been delighted by the crisp, richly detailed view of NGC 253 that the VST can provide.
This latest image of NGC 253 was taken during VST´s science verification phase – when the telescope´s scientific performance is assessed before it enters operations. The VST data are being combined with infrared images from VISTA to identify the younger generations of stars in NGC 253. This picture is more than 12 000 pixels across and the superb sky conditions at ESO´s Paranal Observatory, combined with the fine telescope optics, result in sharp star images over the entire image.
The VST is a 2.6-meter wide-field survey telescope with a one-degree field of view – twice as broad as the full Moon . The VST program is a joint venture between the INAF—Osservatorio Astronomico di Capodimonte, Naples, Italy and ESO. The 268-megapixel camera OmegaCAM at its heart is designed to map the sky both quickly and with very fine image quality. VST is the largest telescope in the world designed to exclusively survey the sky in visible light, complementing ESO’s VISTA infrared survey telescope, also located at Paranal.
Zooming into this new picture not only allows a very detailed inspection of the star-forming spiral arms of the galaxy to be made, but also reveals a very rich tapestry of much more distant galaxies far beyond NGC 253.
 Further details about NGC 253 have been revealed by ESO’s Very Large Telescope (VLT) along with the NASA/ESA Hubble Space Telescope. These instruments showed in 2009 that, at its center, NGC 253 harbors a supermassive black hole with very similar properties to those of the black hole lurking in the Milky Way’s core.
 The image presented here has been cropped and is slightly smaller than the full VST field of view.
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 VLT Survey Telescope (VST) has captured in sharp detail the beauty of the nearby spiral galaxy NGC 253. This new portrait is probably the best wide-field view of this object and its surroundings ever taken. It demonstrates that the VST, the newest telescope at ESO’s Paranal Observatory, provides broad views of the sky while also offering impressive image quality. Luminous regions of ongoing star formation are spread throughout NGC 253, which is pumping out new stars at a furious pace. The data were processed using the VST-Tube system developed by A. Grado and collaborators at the INAF-Capodimonte Observatory Credit: ESO/INAF-VST. Acknowledgement: A. Grado/L. Limatola/INAF-Capodimonte Observatory
Image 2: This chart shows the location of the nearby spiral galaxy NGC 253 within the constellation of Sculptor. This map shows most of the stars visible to the unaided eye under good conditions, and the galaxy itself is marked with a red circle. This galaxy is bright enough to be easily seen as an elongated haze through binoculars from a dark site. Credit: ESO, IAU and Sky & Telescope
Image 3: This image is a color composite made from exposures from the Digitized Sky Survey 2 (DSS2). The field of view is approximately 3.7 x 3.6 degrees. The galaxy NGC 253 appears at the center of the picture and the globular star cluster NGC 288 at the lower left. The cluster is orbiting the Milky Way and is much closer to us than NGC 253, which lies about eleven million light-years from Earth. Credit: ESO/Digitized Sky Survey 2. Acknowledgment: Davide De Martin
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