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Jets from a stellar-mass black hole are as relativistic as those from supermassive black holes
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abstract
Relativistic jets from supermassive black holes in active galactic nuclei are amongst the most powerful phenomena in the universe, acting to regulate the growth of massive galaxies. Similar jets from stellar-mass black holes offer a chance to study the same phenomena on accessible observation time scales. However, such comparative studies across black hole masses and time scales remain hampered by the long-standing perception that stellar-mass black hole jets are in a less relativistic regime. We used radio interferometry observations to monitor the Galactic black hole X-ray binary 4U 1543-47 and discovered two distinct, relativistic ejections launched during a single outburst. Our measurements reveal a likely Lorentz factor of $\sim$ 8 and a minimum of 4.6 at launch with 95% confidence, demonstrating that stellar-mass black holes in X-ray binaries can launch jets as relativistic as those seen in active galactic nuclei.
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Cited by 1 Pith paper
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A Real-Time Jet Laboratory in Swift J1727.8-1613
A single black-hole X-ray binary repeatedly launched jets at different speeds, showing that jet properties vary even when the black hole's mass, spin, and misalignment are fixed.
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