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arXiv 1306.0774astro-ph.HEastro-ph.COastro-ph.GAgr-qc
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河外源的极端质量比爆发

Extreme-mass-ratio-bursts from extragalactic sources

C. P. L. Berry, J. R. Gair

摘要:

极质量比爆发(EMRB)是一类潜在的引力波信号。它们是当一个紧凑的物体通过近心点时产生的,它绕着一个大得多的物体在一个高偏心率的轨道上运行;我们认为恒星质量的物体绕着银河系中心的大质量黑洞(MBH)运行。这样的系统可能在最终完成内旋之前发射许多EMRB。附近有几个星系可能会产生可探测到的爆发。对于像激光干涉仪空间天线这样的星载干涉仪,灵敏度最高的是来自~10^6-10^7太阳质量的MBH的EMRB,可以检测到~100 Mpc。考虑到M32,NGC 4945和NGC 4395的例子,我们调查,如果河外EMRB信号可以提供有关其来源的信息。这是可能的,但前提是轨道的近点半径很小,在r_p < 8 r_g的量级,其中r_g = GM/c^2是MBH的引力半径。这限制了EMRB作为天文工具的实用性。然而,如果我们幸运的话,我们可以以1%的精度对附近MBH的质量和自旋进行限制。

英文摘要:

Extreme-mass-ratio bursts (EMRBs) are a class of potentially interesting gravitational wave signals. They are produced when a compact object passes through periapsis on a highly eccentric orbit about a much more massive object; we consider stellar mass objects orbiting the massive black holes (MBHs) found in galactic centres. Such a system may emit many EMRBs before eventually completing the inspiral. There are several nearby galaxies that could yield detectable bursts. For a space-borne interferometer like the Laser Interferometer Space Antenna, sensitivity is greatest for EMRBs from MBHs of ~10^6-10^7 solar masses, which could be detected out to ~100 Mpc. Considering the examples of M32, NGC 4945 and NGC 4395 we investigate if extragalactic EMRB signals can provide information about their sources. This is possible, but only if the periapse radius of the orbit is small, of the order of r_p < 8 r_g, where r_g = GM/c^2 is the gravitational radius of the MBH. This limits the utility of EMRBs as an astronomical tool. However, if we are lucky, we could place constraints on the mass and spin of nearby MBHs with 1% precision.

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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