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==General information== |
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==General information== |
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] showing the clouds of dense cold gas from which new stars form (red, pink and yellow)]] |
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The Antennae Galaxies are undergoing a galactic collision. Located in the ] with five other galaxies, these two galaxies are known as the Antennae Galaxies because the two long tails of ]s, ] ejected from the galaxies as a result of the collision resemble an ] ]. |
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The ] of the two galaxies are joining to become one giant ]. Most galaxies probably undergo at least one significant collision in their lifetimes. This is likely the future of our ] when it ] with the ]. This collision and merger sequence (the ]) for galaxy evolution was developed in part by successfully modeling the Antennae Galaxies' "antennae" in particular. |
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Five supernovae have been discovered in NGC 4038: ], ], ], ] and ].<ref>{{cite web |
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| title= List of Supernovae |
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| work= IAU Central Bureau for Astronomical Telegrams |
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| url= http://www.cbat.eps.harvard.edu/lists/Supernovae.html |
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| access-date= 2015-08-22}}</ref> |
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A recent study finds that these interacting galaxies are less remote from the Milky Way than previously thought—at 45 million light-years instead of 65 million light-years.<ref>{{cite web |
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| title= The Antennae Galaxies Found To Be Closer To Us |
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| work=Space Daily |
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| date=2008-05-12 |
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| url=http://www.spacedaily.com/reports/The_Antennae_Galaxies_Found_To_Be_Closer_To_Us_999.html |
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| access-date=2008-06-30}}</ref> |
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They are located 0.25° north of ] and 3.25° southwest of ].<ref name="o'meara">{{cite book |title=The Caldwell Objects |first=Stephen James |last=O'Meara |publisher=Cambridge University Press |year=2002 |pages=240–43 |isbn=978-0-521-82796-6 | url=https://books.google.com/books?id=3Hg6YHgx9nAC&pg=PA242}}</ref> |
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The Antennae galaxies also contain a relatively young collection of massive globular clusters that were possibly formed as a result of the collision between the two galaxies.<ref>{{Cite journal|title=van den Bergh, How Did Globular Clusters Form?|journal=The Astrophysical Journal|volume=559|issue=2|pages=L113–L114|doi=10.1086/323754|arxiv=astro-ph/0108298|year=2001|last1=Van Den Bergh|first1=Sidney|bibcode=2001ApJ...559L.113V|s2cid=44060272}}</ref> The young age of these clusters is in contrast to the average age of most known globular clusters (which are around 12 billion years old), with the formation of the globulars likely originating from shockwaves, generated by the collision of the galaxies, compressing large, massive molecular clouds. The densest regions of the collapsing and compressing clouds are believed to be the birthplace of the clusters. |
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==Timeline== |
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==Timeline== |
Areas containing large amounts of neon, magnesium, and silicon were found when the Chandra X-ray Observatory analyzed the Antennae Galaxies. Heavy elements such as these are necessary in order for planets that may contain life (as we know it) to form. The clouds imaged contain 16 times as much magnesium and 24 times as much silicon as the Sun.
Hubble Space Telescope image of NGC 4038 (top) and NGC 4039 (bottom)
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