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arXiv 1602.06951gr-qcastro-ph.COastro-ph.HE
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多波段引力波天文学的前景

The promise of multi-band gravitational wave astronomy

Alberto Sesana

摘要:

我们表明,黑洞二进制(BHB)的合并率推断出先进的LIGO(aLIGO)检测GW 150914意味着一个意想不到的响亮GW天空在毫赫兹频率的不断发展的激光干涉仪空间天线(eLISA),与几个突出的后果。首先,eLISA将能够单独分辨多达数千个BHB;其次,数百万个无法分辨的BHB将产生一个可以检测到的混淆噪声,其信噪比为几到几百;第三,也许是最重要的一点,eLISA将在十年内在aLIGO波段合并多达数百个可单独分辨的BHB。eLISA观测将提前几周告诉aLIGO和所有电磁探测器这些BHB合并将在何时何地发生,不确定性<10秒和<1度^2。这将允许望远镜的预指向,以实现符合GW和多波长电磁观测BHB合并。时间重合是至关重要的,因为与BHB合并相关的即时发射可能具有与系统的动态时间尺度相当的持续时间,并且仅在低频GW警报的情况下才有可能。

英文摘要:

We show that the black hole binary (BHB) coalescence rates inferred from the advanced LIGO (aLIGO) detection of GW150914 imply an unexpectedly loud GW sky at milli-Hz frequencies accessible to the evolving Laser Interferometer Space Antenna (eLISA), with several outstanding consequences. First, up to thousands of BHB will be individually resolvable by eLISA; second, millions of non resolvable BHBs will build a confusion noise detectable with signal-to-noise ratio of few to hundreds; third -- and perhaps most importantly -- up to hundreds of BHBs individually resolvable by eLISA will coalesce in the aLIGO band within ten years. eLISA observations will tell aLIGO and all electromagnetic probes weeks in advance when and where these BHB coalescences are going to occur, with uncertainties of <10s and <1deg^2. This will allow the pre-pointing of telescopes to realize coincident GW and multi-wavelength electromagnetic observations of BHB mergers. Time coincidence is critical because prompt emission associated to a BHB merger will likely have a duration comparable to the dynamical time-scale of the systems, and is only possible with low frequency GW alerts.

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