Disks: X-rays in outburst
€During outburst, outer regions of disk brighten first giving optical emission
€When region of high dissipation reaches inner parts of disk X-ray emission starts to increase
€As accretion rate increases, inner region becomes optically thick and able to radiate very efficiently: temperature drops so that emission is mostly in the Ultra-Violet
UV
X-ray
optical
Wheatley, Mauche & Mattei (2003)