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Title:
Simultaneous optical and X-ray flickering observations of GX 339-4: correlations on sub-second timescales
Authors:
Gandhi, P.
Affiliation:
RIKEN Institute of Physical and Chemical Sciences, 2-1 Hirosawa, Wakoshi, Saitama, 351-0198, Japan
Publication:
OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for Black Holes in the Universe held in Kolkata India, 10-15 February 2008 and the Satellite Meeting on Black Holes, Neutron Stars, and Gamma-Ray Bursts held 16-17 February 2008. AIP Conference Proceedings, Volume 1053, pp. 177-182 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Binary and multiple stars, Galactic nuclei , circumnuclear matter, and bulges, Astronomical and space-research instrumentation
DOI:
10.1063/1.3009478
Bibliographic Code:
2008AIPC.1053..177G

Abstract

We present a fast timing analysis of VLT (optical) and RXTE (X-ray) observations of the Galactic black hole GX 339-4 in the low/hard rapid-flickering state, soon after emerging from outburst. Both optical and X-ray power density spectra are qualitatively similar with a break or QPO-like feature at timescales of ~10-20 s. In a cross-correlation analysis on the fastest time resolution in the light curves (~50-100 ms), a significant (>10 σ) correlation peak is detected, with the optical lagging X-rays by ~150 ms. The correlation exhibits a complex, but stable pattern with a shallow rise, a steep decline, and anti-correlation dips on timescales of several seconds. The optical radiation is unlikely to be a result of reprocessed X-rays. We discuss the results in the context of cyclosynchrotron emission. The complex variability pattern resembles that seen in another important X-ray binary XTE J1118+480, and is likely to be the result of several interacting components in the inner accreting regions. We emphasize the need for further rapid multi-wavelength observations of this fascinating source.
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