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Дата изменения: Sun Mar 4 21:40:35 2001 Дата индексирования: Sat Dec 22 09:11:16 2007 Кодировка: Поисковые слова: m-a 2 |
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
Explanation: Astronomers turn detectives when trying to figure out the cause of unusual sites like NGC 1316. A preliminary inspection indicates that NGC 1316 is an enormous elliptical galaxy that started devouring a smaller spiral galaxy neighbor about 100 million years ago. Supporting evidence includes the dark dust lanes uniquely indicative of a spiral. What remains unexplained are the unusually small globular star clusters, visible as faint dots on the above photograph. Most elliptical galaxies have more and brighter globular clusters than evident in NGC 1316. Yet the observed globulars are too old to have been created by the recent spiral collision. One hypothesis therefore holds that these globulars survive from an even earlier galaxy that was subsumed into NGC 1316.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry
Bonnell (USRA)
NASA Technical Rep.:
Jay Norris.
Specific rights apply.
A service of:
LHEA
at
NASA/
GSFC
&
Michigan Tech. U.