File:NGC 4650A I HST2002.jpg

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Descrizione
English: A Hubble Space Telescope (HST) image of NGC 4650A. Space Telescope Science Institute astronomers are giving the public chances to decide where to aim NASA's Hubble Space Telescope. Guided by 8,000 Internet voters, Hubble has already been used to take a close-up, multi-color picture of the most popular object from a list of candidates, the extraordinary "polar-ring" galaxy NGC 4650A.

Located about 130 million light-years away, NGC 4650A is one of only 100 known polar-ring galaxies. Their unusual disk-ring structure is not yet understood fully. One possibility is that polar rings are the remnants of colossal collisions between two galaxies sometime in the distant past, probably at least 1 billion years ago. What is left of one galaxy has become the rotating inner disk of old red stars in the center. Meanwhile, another smaller galaxy which ventured too close was probably severely damaged or destroyed.

The bright bluish clumps, which are especially prominent in the outer parts of the ring, are regions containing luminous young stars, examples of stellar rebirth from the remnants of an ancient galactic disaster. The polar ring appears to be highly distorted. No regular spiral pattern stands out in the main part of the ring, and the presence of young stars below the main ring on one side and above on the other shows that the ring is warped and does not lie in one plane. Determining the typical ages of the stars in the polar ring is an initial goal of our Polar Ring Science Team that can provide a clue to the evolution of this unusual galaxy. The HST exposures were acquired by the Hubble Heritage Team, consisting of Keith Noll, Howard Bond, Carol Christian, Jayanne English, Lisa Frattare, Forrest Hamilton, Anne Kinney and Zolt Levay, and guest collaborators Jay Gallagher (University of Wisconsin-Madison), Lynn Matthews (National Radio Astronomy Observatory-Charlottesville), and Linda Sparke (University of Wisconsin-Madison).
Data Scattata il 6 maggio 1999
Fonte
Autore The Hubble Heritage Team (AURA/STScI/NASA)
Questa immagine o filmato è stato catalogato tra le
Great Pictures of NASA
della
National Aeronautics and Space Administration
 (NASA) degli Stati Uniti d'Americacon il Photo ID: GPN-2000-000944.

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Licenza

Public domain This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.
The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org. For material created by the European Space Agency on the spacetelescope.org site since 2009, use the {{ESA-Hubble}} tag.

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attuale13:54, 8 lug 2009Miniatura della versione delle 13:54, 8 lug 2009683 × 1 462 (1,36 MB)TryphonOriginal resolution.
20:53, 3 ago 2007Miniatura della versione delle 20:53, 3 ago 2007478 × 1 024 (69 KB)Angusmclellan{{Information |Description=A en:Hubble Space Telescope (HST) image of en:NGC 4650A. Credit: HST/en:NASA/en:ESA. See http://heritage.stsci.edu/1999/16/fast_facts.html . |Source=Originally from [http://en.wikipedia.org en.wikipedia]; d

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