Plik:Stars in the DR21 Region.jpg
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English: Hidden behind a shroud of dust in the constellation Cygnus is an exceptionally bright source of radio emission called DR21. Visible light images reveal no trace of what is happening in this region because of heavy dust obscuration. In fact, visible light is attenuated in DR21 by a factor of more than 10,000,000,000,000,000,000,000,000,000, 000,000,000,000 (ten thousand trillion heptillion).
New images from NASA's Spitzer Space Telescope allow us to peek behind the cosmic veil and pinpoint one of the most massive natal stars yet seen in our Milky Way galaxy. The never-before-seen star is 100,000 times as bright as the Sun. Also revealed for the first time is a powerful outflow of hot gas emanating from this star and bursting through a giant molecular cloud. The upper image is a large-scale mosaic assembled from individual photographs obtained with the InfraRed Array Camera (IRAC) aboard Spitzer. The image covers an area about two times that of a full moon. The mosaic is a composite of images obtained at mid-infrared wavelengths of 3.6 microns (blue), 4.5 microns (green), 5.8 microns (orange) and 8 microns (red). The brightest infrared cloud near the top center corresponds to DR21, which presumably contains a cluster of newly forming stars at a distance of 10,000 light-years. Protruding out from DR21 toward the bottom left of the image is a gaseous outflow (green), containing both carbon monoxide and molecular hydrogen. Data from the Spitzer spectrograph, which breaks light into its constituent individual wavelengths, indicate the presence of hot steam formed as the outflow heats the surrounding molecular gas. Outflows are physical signatures of processes that create supersonic beams, or jets, of gas. They are usually accompanied by discs of material around the new star, which likely contain the materials from which future planetary systems are formed. Additional newborn stars, depicted in green, can be seen surrounding the DR21 region. The red filaments stretching across this image denote the presence of polycyclic aromatic hydrocarbons. These organic molecules, comprised of carbon and hydrogen, are excited by surrounding interstellar radiation and become luminescent at wavelengths near 8.0 microns. The complex pattern of filaments is caused by an intricate combination of radiation pressure, gravity and magnetic fields. The result is a tapestry in which winds, outflows and turbulence move and shape the interstellar medium. To the lower left of the mosaic is a large bubble of gas and dust, which may represent the remnants of a past generation of stars. The lower panel shows a 24-micron image mosaic, obtained with the Multiband Imaging Photometer aboard Spitzer (MIPS). This image maps the cooler infrared emission from interstellar dust found throughout the interstellar medium. The DR21 complex is clearly seen near the center of the strip, which covers about twice the area of the IRAC image. Perhaps the most fascinating feature in this image is a long and shadowy linear filament extending towards the 10 o'clock position of DR21. This jet of cold and dense gas, nearly 50 light-years in extent, appears in silhouette against a warmer background. This filament is too long and massive to be a stellar jet and may have formed from a pre-existing molecular cloud core sculpted by DR21's strong winds. Regardless of its true nature, this jet and the numerous other arcs and wisps of cool dust signify the interstellar turbulence normally unseen by the human eye.Polski: fragment obszaru molekularnego DR 21 |
Data | |
Źródło | http://www.spitzer.caltech.edu/images/1146-ssc2004-06a-Star-Formation-in-the-DR21-Region |
Autor | NASA/JPL-Caltech/A. Marston (ESTEC/ESA) & A. Noriega-Crespo (SSC/Caltech) |
Licencja (Ponowne użycie tego pliku) |
http://www.spitzer.caltech.edu/info/18-Image-Use-Policy |
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Public domainPublic domainfalsefalse |
Ten plik jest w domenie publicznej ponieważ został stworzony przez NASA. Polityka praw autorskich NASA stwierdza, że „materiały NASA nie są chronione prawami autorskimi, chyba że zapisano inaczej”. (NASA copyright policy lub JPL Image Use Policy). | ||
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13 kwi 2004
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Data i czas | Miniatura | Wymiary | Użytkownik | Opis | |
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aktualny | 22:09, 21 cze 2011 | 3600 × 4500 (5,82 MB) | Spitzersteph |
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Tytuł lub opis obrazu |
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Autor | Spitzer Space Telescope |
Właściciel praw autorskich | http://www.spitzer.caltech.edu/Media/mediaimages/copyright.shtml |
Krótki tytuł |
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Dostawca | NASA/JPL-Caltech/A. Marston (ESTEC/ESA)&A. Noriega-Crespo (SSC/Caltech) |
Nagłówek | Hidden behind a shroud of dust in the constellation Cygnus is an exceptionally bright source of radio emission called DR21. Visible light images reveal no trace of what is happening in this region because of heavy dust obscuration. |
Źródło | Spitzer Space Telescope |
Warunki wykorzystania |
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Data i czas utworzenia oryginału | 13 kwi 2004 |
Szerokość | 3600 px |
Wysokość | 4500 px |
Bitów na próbkę |
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Metoda kompresji | LZW |
Interpretacja fotometryczna | RGB |
Orientacja obrazu | normalna |
Próbek na piksel | 3 |
Rozdzielczość w poziomie | 450 punktów na cal |
Rozdzielczość w pionie | 450 punktów na cal |
Rozkład danych | format masywny |
Użyte oprogramowanie | Adobe Photoshop CS3 Macintosh |
Data i czas modyfikacji pliku | 14:39, 5 cze 2009 |
Przestrzeń kolorów | sRGB |
Kontakt |
http://www.spitzer.caltech.edu 1200 E. California Blvd. Pasadena, CA, 91125 USA |
Słowa kluczowe | DR21 |
Wersja IIM | 2 |