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Thursday 15 October 2026

Chandra ties the Treble Clef to a galaxy cluster collision

Chandra and LOFAR show VLSS J0318.9+5755 is a radio phoenix revived when two galaxy clusters collided behind the Milky Way.

Liora Hale Thursday 15 October 2026, open calendar5 min read

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Look long enough at the radio map and you will swear someone drew a treble clef across a galaxy cluster. Astronomers say that is pareidolia. The physics underneath it is a black-hole outburst that went quiet, then a collision of two clusters that lit the old plasma up again.

A pink twisting band of radio light threading through a blue haze of hot gas against a field of stars — Image: X-ray NASA/CXC/INAF-IRA/A. Botteon et al., infrared UKIDSS-GPS, radio ASTRON/LOFAR

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Liora Hale Thursday 15 October 2026 at 2:10 pm Adelaide, open calendar5 min read

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