A Relativistic Outflow Detected in the Hard State from the Microquasar GRS 1758-258.
Abstract
Outflows are observed from accreting systems on all mass scales in the form of collimated jets and wider angle accretion disk winds. Previous observations have suggested a paradigm wherein the accretion disk wind is strongly suppressed in the hard spectral state and present in the soft spectral state, whereas the jet is observed to behave in the opposite sense. We will present the results of a Suzaku observation of the persistently accreting Galactic microquasar GRS 1758-258 while the source was in the low-hard state (L_x ∼ 0.01 L_{Edd}). Analysis of the Suzaku observation reveals the presence of a highly ionized relativistic wind (v ∼ 0.1c) originating in the inner regions of the accretion flow. The broad nature of the observed absorption line suggests that it is the signature of a stratified relativistic outflow. This is the highest velocity wind detected from a stellar mass X-ray binary to date, demonstrating the viability of the wind launching mechanism down to luminosities of at least 1% L_{Edd}.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E2834R