When MAXI J0637−430, a binary system containing a black hole, began to fade after a major outburst, something unexpected happened: the outer regions of its disc became more illuminated, rather than less. A study published in Nature Astronomy, led by Montserrat Armas Padilla, a researcher at the Instituto de Astrofísica de Canarias, has revealed that this behaviour is due to changes in the shape of the inner part of the disc, which can cast a shadow over the regions furthest from the black hole. During the brightest phase of the outburst, this structure had swollen, blocking some of the
Advertised on