New observations made by the NASA/ESA Hubble Space Telescope have allowed astronomers to measure the motion of this black-hole system across the sky using images taken in 1996 and 2001. The results are surprising: the black hole streaks across the plane of our Milky Way at a velocity four times that of stars around it! This is the first direct link between black holes and the supernovae that create them.


 
Artist's impression shows an oblique view of our Milky Way galaxy. The black-hole system GRO J1655-40 is streaking through space at a rate of 400 000 kilometres per hour - 4 times faster than the average velocity of the stars in the galactic neighbourhood. The yellow star is our Sun.


 
NASA/ESA Hubble Space Telescope image shows the Year 2001 observation of the black-hole system GRO J1655-40 in the constellation of Scorpius. Hubble's high resolution has allowed astronomers to measure the motion of this black-hole system across the sky using this image and an image taken in 1996. Scientists combined the Hubble data with those obtained from ground-based telescopes and found that the black hole is moving through space with a velocity of 400 000 kilometres per hour. This has provided possibly the best evidence yet that stellar-mass black holes are made in supernova explosions.

The 720-second exposure was taken through a red filter.



Release date: 13 September 2004