Speaker
Dr
Federico Vincentelli
(University of Southampton)
Description
We present the discovery of sub-second X-ray/IR correlated variability in the accreting neutron star (NS) 4U 1728-34. The source was observed with simultaneous high time resolution XMM and HAWKI@VLT in February 2019. Data show a strongly correlated signal with a lag shorter than 0.125 s. Such behaviour is well known in black-hole transients, where fluctuations travel from the accretion inflow to an IR emitting jet with a lag of 0.1s. Given that observations were taken during the hard state (i.e. when the jet is active), this result points towards a common jet mechanism for BH and NS. We discuss the physical implications of this discovery and the future perspectives of multiwavelength variability in accreting NS.
Authors
Dr
Federico Vincentelli
(University of Southampton)
Dr
Piergiorgio Casella
(INAF -OAR)
Dr
Simone Migliari
(European Space Agency)
Dr
Maria Diaz-Trigo
(ESO)
Dr
Yuri Cavecchi
(University of Southampton)
