2013. 8. 9. 12:19ㆍ별 이야기
Cartwheel Galaxy:
Astronomers Do Flips Over Cartwheel Galaxy
Credit: Composite: NASA/JPL/Caltech/P.Appleton et al. X-ray: NASA/CXC/A.Wolter & G.Trinchieri et al.
This image combines data from four different observatories: the Chandra X-ray Observatory (purple); the Galaxy Evolution Explorer satellite (ultraviolet/blue); the Hubble Space Telescope (visible/green); the Spitzer Space Telescope (infrared/red). The unusual shape of the Cartwheel Galaxy is likely due to a collision with one of the smaller galaxies on the lower left several hundred million years ago.
The smaller galaxy produced compression waves in the gas of the Cartwheel as it plunged through it. These compression waves trigger bursts of star formation. The most recent star burst has lit up the Cartwheel's rim, which has a diameter larger than that of the Milky Way galaxy, with millions of bright young stars.
When the most massive of these stars explode as supernovas, they leave behind neutron stars and black holes. Some of these neutron stars and black holes have nearby companion stars, and have become powerful sources of X-rays as they pull matter off their companions.
The brightest X-ray sources are likely black holes with companion stars, and appear as the white dots that lie along the rim of the X-ray image. The Cartwheel contains an exceptionally large number of these black hole binary X-ray sources, because many massive stars formed in the rim.
The Beautiful Universe: Chandra in HD
High definition views of Chandra's exciting science
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NASA's Chandra Sees Eclipsing Planet in X-rays for First Time
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-- NASA's Chandra Sees Eclipsing Planet in X-rays for First Time
Stars like the Sun can become remarkably photogenic at the end of their life.
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-- A Beautiful End to a Star's Life
Astronomers estimate that a star explodes as a supernova in our Galaxy, on average, about twice per century.
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-- The Remarkable Remains of a Recent Supernova
Many consider Andromeda, also known as Messier 31, to be a sister galaxy to our own Milky Way.
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-- Black Hole Bonanza Turns up in Galaxy Next Door
-- Tour of M31
While most of us use electricity every day without thinking about it, maybe take a moment to look around.
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-- Here, There, and Everywhere
A magnetar is a type of neutron star that occasionally generates bursts of X-rays.
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-- A Hidden Population of Exotic Neutron Stars
-- Tour of SGR 0418+5729
Astronomers think that just about every galaxy contains a giant, or supermassive, black hole at their center.
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-- Black Hole Powered Jets Plow Into Galaxy
-- Tour of 4C+29.30
There are patterns of beauty across our Earth and throughout the Universe.
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-- From the Earth to the Heaven
Most of us have heard the story of the tortoise and the hare. The tortoise is slow and the hare is fast. But what exactly does this mean?
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-- STOP for Science
Two large galaxies are colliding and scientists have used Chandra to make a detailed study of an enormous cloud of hot gas that surrounds them.
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