Recently we had a rare X-Ray Novae near where we suspect the black hole to be, eating up the gas from a companion star. The outburst viewed by Astronomers was identified by them to be a blue light X-ray Nova. This is only produced when the gases of the star rushes toward a black hole or a neutron star. Scientists feel that the behavior being displayed is one that the X-ray Nova only does in the presence of a black hole. The picture to the right shows the gas which builds up in a storage disc around the black hole eventually ‘outbursts’. The outburst is described by observable light of the system that increases by a factor between 100 and 10000 in X-rays and optical. These type of Novae are rare and short lived.
The outburst is triggered when the density of the accretion disk exceeds a certain critical value that gives way to the heating of the disc which then ignites the temperature which ionizes the gas. The whole occurrence is a row of Dominos that once one falls over the rest are going to follow. It is when the instability gets to the accretion disk’s inner portion the brightness becomes more evident and the outburst begins. This if followed by the outer accretion disk getting further heated by the radiation.
Anyway, if you haven’t heard about it, I am sure we will be told of its discovery again. Maybe when we plan a mission to the black hole!