Accretion in the faint regime and the break down of jet-accretion coupling
Abstract
For the last two decades an observational picture has developed on accretion in black holes versus neutron stars, showing a clear (yet not well-understood) coupling between the accretion flow (as traced by the non-thermal emission in the X-rays during the low hard state), and the jet outflow (as indicated by the self-absorbed partially compact jet emission in the radio). Accreting black holes appeared to show brighter jet outflows compared to neutron stars with similar X-ray luminosities. This distinction formed a fantastic diagnostic tool to distinguish accreting neutron stars from black hole candidates. However, over the past few years, the availability of sensitive joint radio and X-ray observing programs has allowed a deeper study of this coupling and has led to the identification of numerous faintly accreting systems that appear to violate this correlation in various ways. In this talk, I will review some of the recent developments in the study of disk-jet coupling in the low accretion regime, and will present results of our recent deep studies of a handful of such systems and the caveats that they imply on the use of this correlation as a diagnostic tool.
- Publication:
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43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E1687B