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Title:
Simultaneous Optical And X-ray Flickering Observations Of GX 339-4: Correlations On Sub-second Timescales
Authors:
Gandhi, Poshak; Makishima, K.; Fabian, A.; Durant, M.; Shahbaz, T.; Dhillon, V.; Marsh, T.; Miller, J.; Spruit, H.
Affiliation:
AA(RIKEN Institute of Physical and Chemical Sciences, Japan), AB(RIKEN Institute of Physical and Chemical Sciences, Japan), AC(Institute of Astronomy, United Kingdom), AD(Instituto de Astrofisica de Canarias, Spain), AE(Instituto de Astrofisica de Canarias, Spain), AF(University of Sheffield, United Kingdom), AG(University of Warwick, United Kingdom), AH(University of Michigan), AI(Max Planck Institute for Astrophysics, Germany)
Publication:
American Astronomical Society, HEAD meeting #10, #1.06
Publication Date:
03/2008
Origin:
AAS
Bibliographic Code:
2008HEAD...10.0106G

Abstract

We present a rapid timing analysis of VLT (optical) and RXTE data of the Galactic black hole GX 339-4 in the low/hard state in June 2007, soon after emerging from outburst. Both optical and X-ray power density spectra are qualitatively similar with QPO-like feature or a break around 0.05-0.1 Hz. A cross-correlation function (CCF) analysis finds no positive correlation on timescales on 1 s or longer, similar to previous observations in the bright state. Searching for signal on the fastest (50 ms) timescales available, on the other hand, a significant cross-correlation peak is detected, with the optical lagging the X-rays by 150 ms. The CCF is narrow with a shallow rise and sharp decline to an anti-correlation dip. The X-ray auto-correlation function (ACF) is broader than the optical ACF, arguing against re-processing as the emission mechanism for the optical power. Similarities and differences with respect to the complex behaviour of XTE J1118+480 are discussed and the need for further rapid variability observations of this fascinating source are emphasized.
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