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Friday, June 07, 2019
2:00 PM - 3:00 PM
Cahill 370

TAPIR Seminar

Black Hole Spin Misalignments in Microquasars
Greg Salvesen, NSF Astronomy & Astrophysics Postdoc Fellow, Department of Physics, University of California, Santa Barbara,

A microquasar is a black hole X-ray binary with outflowing jets. Conventional theory predicts alignment between three axes of a microquasar system: the black hole spin axis, the jet axis, and the rotational axis of the inner disk regions. However, these axes need not be aligned to the binary orbital axis. Understanding the origin of spin-orbit misalignments is important for predicting black hole merger statistics, measuring black hole spin, and interpreting variability in X-ray binaries. I will show that the standard model of a supernova kick imparted to the natal black hole struggles to explain the >60 degree spin-orbit misalignment in the microquasar V4641 Sgr. This result has several implications related to binary star evolution, core-collapse supernovae, and black hole phenomena.

For more information, please contact JoAnn Boyd by phone at 4280 or by email at joann@caltech.edu.