White Dwarfs near Black Holes: A New Paradigm for Type I Supernovae
White Dwarfs near Black Holes: A New Paradigm for Type I Supernovae
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黑洞附近的白矮星：I 型超新星的新范式
DOI：
10.1086/421449
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
G. Mathews
中科院分区：
文献类型：
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作者：
J. Wilson;G. Mathews
我们给出的计算表明了一类新的I型超新星的可能性。在这个新的范例中，相对论术语增强了碳-氧白矮星经过黑洞或在黑洞附近运行时的自引力。这种相对论压缩会导致中心密度超过非核反应的阈值，从而导致热核失控。我们考虑了三种可能的环境：(1)围绕低质量(~10-20M☉)黑洞运行的白矮星；(2)在致密球状星团中遇到质量[~(1-3)×103M☉]黑洞的白矮星；(3)在致密星系核中穿过超大质量(~106M-109M☉)黑洞的白矮星。我们估计了红移为z≈1的超新星事件的发生率，估计这三类超新星的发生率都明显低于正常Ia型超新星的发生率。然而，这样的事件可能足够频繁，足以证明我们有理由寻找这类新的超新星。我们提出了几个可以用来识别这类事件的可观测信号，并推测这种事件可能产生了银河系核心中观察到的“混合形态”SGR A东部超新星遗迹。
We present calculations indicating the possibility of a new class of Type I supernovae. In this new paradigm, relativistic terms enhance the self-gravity of a carbon-oxygen white dwarf as it passes or orbits near a black hole. This relativistic compression can cause the central density to exceed the threshold for pycnonuclear reactions so that a thermonuclear runaway ensues. We consider three possible environments: (1) white dwarfs orbiting a low-mass (~10-20 M☉) black hole, (2) white dwarfs encountering a massive [~(1-3) × 103 M☉] black hole in a dense globular cluster, and (3) white dwarfs passing a supermassive (~106-109 M☉) black hole in a dense galactic core. We estimate the rate at which such events could occur out to a redshift z ≈ 1. Event rates are estimated to be significantly less than the rate of normal Type Ia supernovae for all three classes. Nevertheless, such events may be frequent enough to warrant a search for this new class of supernova. We propose several observable signatures that might be used to identify this type of event and speculate that such an event might have produced the observed "mixed-morphology" Sgr A East supernova remnant in the Galactic core.