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Closest and Smallest Black Hole Known Discovered
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A slightly larger (3.3 solar masses vs 3 solar masses) black hole in a similar binary has been described in https://ui.adsabs.harvard.edu/abs/2019Sc...T/abstract and https://arxiv.org/abs/1806.02751

It seems to be about 3kpc away, though, currently outside the Terragen sphere.

Eta: both of these are classified as non-interacting black holes (I.e. no accretion disk), of which about 1,000 are estimated to be detectable by Gaia. So I’d guess maybe a dozen might be in the Terragen sphere.
Selden
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RE: Closest and Smallest Black Hole Known Discovered - by selden - 04-25-2021, 02:38 AM

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