Decoding the heartbeat of the microquasar GRS 1915+105: Disk wind Connection

GRS 1915+105 is a microquasar that shows extreme variability in X-ray, IR and radio bands. It shows disk emission, relativistic jets and strong winds during its different states. We observed this source recently with NuSTAR and Chandra during the heartbeat state, characterized a 50 seconds strong oscillations. The oscillations are likely due to thermal/viscous instability in the inner disk when it deviates significantly from the standard Shakura & Sunyaev disk. Combining the high sensitivty of Nustar and the high resolution of Chandra, we use phase spectroscopy to study the details of these oscillation, revealing changes in the inner accretion disk as well as the launching of powerful winds during the oscillations. I will discuss the implications of these results on accretion physics, the thermal instability and the launching mechanism of the wind.