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arXiv 1002.1233astro-ph.HE
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来自GX 339-4中相对论性喷流的快速红外变率

Fast infrared variability from a relativistic jet in GX 339-4

P. Casella, T. J. Maccarone, K. O'Brien, R. P. Fender, D. M. Russell, M. van der Klis, A. Pe'er, D. Maitra, D. Altamirano, T. Belloni, G. Kanbach, M. Klein-Wolt… 展开作者

P. Casella, T. J. Maccarone, K. O'Brien, R. P. Fender, D. M. Russell, M. van der Klis, A. Pe'er, D. Maitra, D. Altamirano, T. Belloni, G. Kanbach, M. Klein-Wolt, E. Mason, P. Soleri, A. Stefanescu, K. Wiersema, R. Wijnands

摘要:

我们提出了在黑洞瞬态GX 339-4中发现的快速红外/X射线相关变化。2008年8月,在其持续的低通量高变硬态期间,VLT/ISAAC和RXTE/PCA同时以亚秒级时间分辨率观测到该源。数据显示出强烈的相关变化,红外辐射比X射线辐射滞后100 ms。短的时间延迟和几乎对称的交叉关联函数,以及测量到的~2.5 x 10^6 K的亮度温度,表明明亮且高度可变的红外辐射很可能来自黑洞附近的喷流。在喷流物理学的标准假设下,测得的时间延迟可以为我们提供一个γ> 2的喷流的洛伦兹因子的下限。这表明,来自恒星质量黑洞的喷流在其发射区域附近至少具有温和的相对论性。我们讨论了这种技术的未来应用的影响。

英文摘要:

We present the discovery of fast infrared/X-ray correlated variability in the black-hole transient GX 339-4. The source was observed with sub-second time resolution simultaneously with VLT/ISAAC and RXTE/PCA in August 2008, during its persistent low-flux highly variable hard state. The data show a strong correlated variability, with the infrared emission lagging the X-ray emission by 100 ms. The short time delay and the nearly symmetric cross-correlation function, together with the measured brightness temperature of ~2.5 x 10^6 K, indicate that the bright and highly variable infrared emission most likely comes from a jet near the black hole. Under standard assumptions about jet physics, the measured time delay can provide us a lower limit of Gamma > 2 for the Lorentz factor of the jet. This suggests that jets from stellar-mass black holes are at least mildly relativistic near their launching region. We discuss implications for future applications of this technique.

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