Hunting Black Holes with Gaia
Monthly Notices of the Royal Astronomical Society(2017)
Abstract
We predict the number of black holes with stellar companions that are potentially detectable with Gaia astrometry over the course of its five-year mission. Our model estimates that nearly 2×10^5 astrometric binaries hosting black holes and stellar companions brighter than Gaia's detection threshold, G ∼ 20, should be discovered with 5σ sensitivity. Among these detectable binaries, systems with longer orbital periods are favored, and black hole and stellar companion masses in the range M_BH∼ 6-10 M_⊙ and M_* ∼ 1-2 M_⊙, respectively, are expected to dominate.
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Key words
astrometry,binaries: general,stars: black holes
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