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arXiv 1807.07599astro-ph.HE
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两个显著的人马座A* 耀斑的多波长光变曲线

Multiwavelength Light Curves of Two Remarkable Sagittarius A* Flares

G. G. Fazio, J. L. Hora, G. Witzel, S. P. Willner, M. L. N. Ashby, F. Baganoff, E. Becklin, S. Carey, D. Haggard, C. Gammie, A. Ghez, M. A. Gurwell, J. Ingalls,… 展开作者

G. G. Fazio, J. L. Hora, G. Witzel, S. P. Willner, M. L. N. Ashby, F. Baganoff, E. Becklin, S. Carey, D. Haggard, C. Gammie, A. Ghez, M. A. Gurwell, J. Ingalls, D. Marrone, M. R. Morris, H. A. Smith

摘要:

Sgr A* 是位于银河系中心的超大质量黑洞(SMBH),是X射线、近红外(NIR)和亚毫米(submm)辐射的可变源,因此是研究质量吸积流到黑洞和/或相关喷流上产生的电磁辐射的主要候选者。解开这种变化的电源和发射机制是一个核心的挑战,我们了解吸积流周围SMBH。同时对通量变化及其时间相关性进行多波长观测,可以在更好地了解可能的发射机制及其起源方面发挥重要作用。本文介绍了两个耀斑的观测结果,这两个耀斑都明显违反了以前建立的模式,在相对时间的亚毫米/近红外/X射线耀斑从Sgr A*。其中一个事件提供了近红外和亚毫米级通量增加之间的同时期结构的第一个证据,而第二个事件是亚毫米级/X射线/近红外通量增加序列的第一个例子,所有发生在~1 hr. Each这两个事件似乎颠覆了假设,一直是一些分析模型的基础上耀斑在Sgr A*。然而,不能排除这些事件,即使不寻常,只是巧合。这些观察结果表明,我们并没有完全理解的起源的多波长变异性的Sgr A*,并表明,有一个持续的和重要的需要长期的,协调的,精确的多波长观测的Sgr A*,以表征全范围的变异行为。

英文摘要:

Sgr A*, the supermassive black hole (SMBH) at the center of our Milky Way Galaxy, is known to be a variable source of X-ray, near-infrared (NIR), and submillimeter (submm) radiation and therefore a prime candidate to study the electromagnetic radiation generated by mass accretion flow onto a black hole and/or a related jet. Disentangling the power source and emission mechanisms of this variability is a central challenge to our understanding of accretion flows around SMBHs. Simultaneous multiwavelength observations of the flux variations and their time correlations can play an important role in obtaining a better understanding of possible emission mechanisms and their origin. This paper presents observations of two flares that both apparently violate the previously established patterns in the relative timing of submm/NIR/X-ray flares from Sgr A*. One of these events provides the first evidence of coeval structure between NIR and submm flux increases, while the second event is the first example of the sequence of submm/X-ray/NIR flux increases all occurring within ~1 hr. Each of these two events appears to upend assumptions that have been the basis of some analytic models of flaring in Sgr A*. However, it cannot be ruled out that these events, even though unusual, were just coincidental. These observations demonstrate that we do not fully understand the origin of the multiwavelength variability of Sgr A*, and show that there is a continued and important need for long-term, coordinated, and precise multiwavelength observations of Sgr A* to characterize the full range of variability behavior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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