Timing properties and X-ray lags of an ultraluminous X-ray source
Abstract
I will present results obtained from a comprehensive X-ray variability and spectral-timing analysis of the ultraluminous X-ray source (ULX) NGC 5408 X-1. We find that the source's variability properties closely resemble those of black hole binary systems (BHB) during canonical hard-intermediate states. The detection of a highly significant soft X-ray lag, which is one of the main results, will be presented and discussed. In particular, I will point out the analogies with reverberation X-ray lags observed in different BH-accreting systems (from active galactic nuclei to BHB), which suggest the same triggering mechanism is at work in sources of widely different sizes.
- Publication:
-
The X-ray Universe 2014
- Pub Date:
- July 2014
- Bibcode:
- 2014xru..confE..59D