Dwarf Galaxy Caught Ramming into a Large Spiral

  • Released Friday, November 1, 2013

Shown here, observations from NASA's Chandra X-ray telescope reveal a massive cloud of multimillion-degree gas in a galaxy about 60 million light years from Earth. The hot gas cloud is likely caused by a collision between a dwarf galaxy [bottom left] and a much larger galaxy called NGC 1232 [center]. The image, which combines X-rays and optical light, shows the scene of the collision. Chandra X-ray data, in purple, show the hot gas has a comet-like appearance, caused by the motion of the dwarf galaxy. Optical data from the European Southern Observatory's Very Large Telescope reveal the spiral galaxy in blue and white. The X-ray emission source at the top right of the image appears to be unrelated to the galaxy collision. If confirmed, this discovery would mark the first time such a collision has been detected only in X-rays, and could have implications for understanding how galaxies grow through similar collisions. The impact between the dwarf galaxy and the spiral galaxy caused a shock wave—akin to a sonic boom on Earth—that generated the hot gas with a temperature of about 6 million degrees.

Used in 2014 Calendar.

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Please give credit for this item to:
NASA/Chandra X-ray Observatory/Huntingdon Institute for X-ray Astronomy/G.Garmire/European Southern Observatory/Very Large Telescope

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This page was originally published on Friday, November 1, 2013.
This page was last updated on Tuesday, November 14, 2023 at 12:25 AM EST.


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