Sub-second X-ray/IR variability from accreting neutron stars
Abstract
The study of fast multi-wavelength variability in black hole X-ray binaries (BHXRB) has opened a new window in the study of the jets of these systems. Here we present the first result of simultaneous X-ray/IR subsecond variability of two accreting neutrons using XMM-Newton and HAWK-I@VLT: the archetypal low Atoll 4U 1728-34 and the newly discovered high accretion rate source, Swift J1858. Our measurement show the presence of X-ray/IR delays consistent with reprocessing of the outer disk. We therefore developed a numerical model to reproduce the lags due to irradiation which allowed us to put strong constrains on the orbital parameters of these sources. Moreover, we found for the first time strong evidence for non-thermal radiation from the jet in both sources. These measurements open a new window on the study of accreting neutron stars shedding light on the jet emission and launching mechanism of these sources, as already done for BHXRB.
- Publication:
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44th COSPAR Scientific Assembly. Held 16-24 July
- Pub Date:
- July 2022
- Bibcode:
- 2022cosp...44.2361V