Monday, February 14, 2011
Happy Valentine's Day
And this from NASA:
Just in time for Valentine's Day comes a new image of a ring -- not of jewels -- but of black holes. This composite image of Arp 147, a pair of interacting galaxies located about 430 million light years from Earth, shows X-rays from the NASA's Chandra X-ray Observatory (pink) and optical data from the Hubble Space Telescope (red, green, blue) produced by the Space Telescope Science Institute (STScI) in Baltimore, Md.
Arp 147 contains the remnant of a spiral galaxy (right) that collided with the elliptical galaxy on the left. This collision has produced an expanding wave of star formation that shows up as a blue ring containing in abundance of massive young stars. These stars race through their evolution in a few million years or less and explode as supernovas, leaving behind neutron stars and black holes.
A fraction of the neutron stars and black holes will have companion stars, and may become bright X-ray sources as they pull in matter from their companions. The nine X-ray sources scattered around the ring in Arp 147 are so bright that they must be black holes, with masses that are likely ten to twenty times that of the Sun.
An X-ray source is also detected in the nucleus of the red galaxy on the left and may be powered by a poorly-fed supermassive black hole. This source is not obvious in the composite image but can easily be seen in the X-ray image. Other objects unrelated to Arp 147 are also visible: a foreground star in the lower left of the image and a background quasar as the pink source above and to the left of the red galaxy.
Subscribe to:
Post Comments (Atom)
Posts
No comments:
Post a Comment
→ Thank you for contributing to the conversation by commenting. We try to read all of the comments (but don't always have the time).
→ If you write a long comment, please use paragraph breaks. Otherwise, no one will read it. Many people still won't read it, so shorter is usually better (but it's your choice).
→ The following types of comments will be deleted if we happen to see them:
-- Comments that criticize any class of people as a whole, especially when based on an attribute they don't have control over
-- Comments that explicitly call for violence
→ Because we do not read all of the comments, I am not responsible for any unlawful or distasteful comments.