Cygnus X-3 in 2024: many giant radio flares!

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• Prof. Dave Green (Cavendish Astrophysics)
• Tuesday 04 March 2025, 11:15-12:00
• Martin Ryle Seminar Room, Kavli Institute.

If you have a question about this talk, please contact Charles Walker.

Cygnus X-3 is a `high mass X-ray binary’, which was first detected in the early days of X-ray astronomy, in 1966. It is also seen in the radio and the infra-red (but not optically due to obscuration). The emission is due to accretion from the companion star onto the compact source, thought to be a Wolf-Rayet star and a black hole respectively. It occasionally shows giant fares, and has been monitored—approximately daily—for several years with the Arcminute Microkelvin Image (AMI) at Lord’s Bridge, SW of Cambridge. During 2022 and 2023 was placid, with little variation in its radio (or X-ray) emission, but in 2024 it showed five giant radio flares, brightening from a few mJy to > 10 Jy over a few days.

This talk is part of the Hills Coffee Talks series.

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