Light curves of the black-hole GU Muscae

Early scientific highlight from the first few nights of the ULTRACAM observing campaign on the Very Large Telescope: light curves in the i''- (red) and g''-band (green) of the quiescent black-hole X-ray transient GU Muscae. This object consists of a black hole in a 10-hour orbit with a normal solar-like star. The black hole is surrounded by an accretion disc of material transferred from the solar-like star. As this material accretes onto the black hole, energy is released, and this is evident from the large-amplitude flares visible in the light curves. What was not expected, however, is the series of sharp spikes that can be seen, and which are separated by approximately 7 minutes. Such a stable signal must be tied to a relatively stable structure in the accretion disc.

Credit:

ESO

About the Image

Id:eso0520b
Type:Chart
Release date:9 June 2005
Related releases:eso0520
Size:2371 x 1919 px

About the Object

Name:GU Muscae
Type:• Milky Way : Star : Evolutionary Stage : Black Hole
• Milky Way : Star : Type : Exotic : X-Ray Binary
Distance:17000 light years

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