Rapid timing studies of black hole binaries in Optical and X-rays: correlated and non-linear variability
| Autor: | Gandhi, Poshak, Makishima, Kazuo, Durant, Martin, Fabian, Andrew, Dhillon, Vik, Marsh, Tom, Miller, Jon, Shahbaz, Tariq, Spruit, Henk |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | 宇宙航空研究開発機構特別資料: = JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H. :256-259 |
| ISSN: | 1349-113X |
| Popis: | The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan In one of the fastest multi-wavelength timing studies of black hole X-ray binaries (BHBs) with large telescopes to date, we have discovered correlated optical and X-ray variability in the low/hard state of the source GX 339-4. Only two other BHBs are currently known to show rapid (sub-second) aperiodic optical flickering: XTE J1118+480 and Swift J1753.5-0127. Our simultaneous VLT/Ultracam and RXTE/PCA data reveal intriguing patterns with characteristic peaks, dips and lags down to very short timescales (less than or approximately 150 ms). Reprocessing can be ruled out as the origin of the aperiodic optical power. Instead, the variability may be driven by synchrotron emission from the inner accretion flow regions, with interactions between the disk, jet and corona resulting in the complex correlation patterns. We also show that both the optical and X-ray lightcurves are intrinsically non-linear, in the sense that the absolute variability r.m.s. amplitude linearly increases with flux. The implication is that variability at both wavelengths is not due to local fluctuations alone, but rather arises as a result of coupling of perturbations over a wide range of radii and timescales. These 'optical and X-ray rms-flux relations' thus provide new constraints to connect the outer disk with the inner hot flow and jet. Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science 資料番号: AA0064574094 レポート番号: JAXA-SP-09-008E |
| Databáze: | OpenAIRE |
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