Ficheiro:A distinctly disorganised dwarf.jpg
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Resumo
DescriciónA distinctly disorganised dwarf.jpg |
English: Despite being less famous than their elliptical and spiral galactic cousins, irregular dwarf galaxies, such as the one captured in this NASA/ESA Hubble Space Telescope image, are actually one of the most common types of galaxy in the Universe. Known as UGC 4459, this dwarf galaxy is located approximately 11 million light-years away in the constellation of Ursa Major (The Great Bear), a constellation that is also home to the Pinwheel Galaxy (M101), the Owl Nebula (M97), Messier 81, Messier 82 and several other galaxies all part of the M81 group.
UGC 4459’s diffused and disorganised appearance is characteristic of an irregular dwarf galaxy. Lacking a distinctive structure or shape, irregular dwarf galaxies are often chaotic in appearance, with neither a nuclear bulge — a huge, tightly packed central group of stars — nor any trace of spiral arms — regions of stars extending from the centre of the galaxy. Astronomers suspect that some irregular dwarf galaxies were once spiral or elliptical galaxies, but were later deformed by the gravitational pull of nearby objects. Rich with young blue stars and older red stars, UGC 4459 has a stellar population of several billion. Though seemingly impressive, this is small when compared to the 200 to 400 billion stars in the Milky Way! Observations with Hubble have shown that because of their low masses, star formation is very low compared to larger galaxies. Only very little of their original gas has been turned into stars. Thus, these small galaxies are interesting to study to better understand primordial environments and the star formation process. |
Data | |
Orixe | http://www.spacetelescope.org/images/potw1613a/ |
Autoría |
ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla) |
Licenza
ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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Créditos/Provedor | ESA/Hubble & NASA Acknowledgement: Judy Schmidt (Geckzilla) |
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Orixe | ESA/Hubble |
Termos de uso |
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Título curto |
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Título da imaxe |
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Data e hora de xeración do ficheiro | 28 de marzo de 2016 ás 06:00 |
Software utilizado | Adobe Photoshop CC 2014 (Windows) |
Estado dos dereitos de autor | Dereitos de autoría non definidos |
Identificación única do documento orixinal | xmp.did:ddd73821-01f3-0a4d-b202-65c97b594119 |
Información de contacto |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Palabras clave | UGC 4459 |
Versión IIM | 4 |