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LIGO, High Gear Science Run
post Feb 11 2016, 07:08 PM
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QUOTE (hendric @ Feb 11 2016, 07:36 PM) *
Nice article about the post-doc who was monitoring when the event occurred:


Great stuff. "He reached only one of the facilities—“Livingston, I think,” he says—but was told all was normal".
If only his words were "Livingston, I presume" smile.gif
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post Feb 12 2016, 08:22 PM
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An interesting possible second binary black hole merger, from GW150914: First results from the search for binary black hole coalescence with Advanced LIGO

The second most significant candidate event in the observation period (referred to as LVT151012) was reported on October 12, 2015 at 09:54:43 UTC with a combined matched filter SNR of 9:6. The search reported a false alarm rate of 1 per 2.3 years and a corresponding false alarm probability of 0.02 for this candidate event. Detector characterization studies have not identified an instrumental or environmental artifact as causing this candidate event. However, its false alarm probability is not sufficiently low to confidently claim this candidate event as a signal. Detailed waveform analysis of this candidate event indicates that it is also a binary black hole merger with source frame masses 23 M Sun and 13 MSun , if it is of astrophysical origin.

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post Jun 20 2016, 03:48 PM
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Now that a second black hole merger have been detected with high confidence. The idea that such events might be common have surfaced and made some think in radically new lines to explain how such events might happen quite often.
One hypothesis is that black holes and stars in the central part of globular clusters might collect in a 'Mosh pit' - I have a hunch that one of the team must be a metalhead for that expression to be used - indeed is a good term to describe the chaotic conditions and collisions that can occur in such a volume of space where stars and black holes are comparably tightly packed together.
Northwestern univ summary, video and link to the actual paper.
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