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ALMA and Hubble reveal galaxy merger Arp 220

Original: ALMA and Hubble image of Arp 220, also known as IC 4553. A merger of two spiral galaxies set of a burst of star formatio

Astronomers have released a combined ALMA and Hubble image of Arp 220, also known as IC 4553, a pair of colliding spiral galaxies roughly 250 million light-years away. The merger triggered a powerful burst of star formation that backlights the dust lanes in the Hubble visible-light view, while ALMA's millimetre-wavelength data marks dense molecular gas where new stars are forming.

Why now: Space enthusiasts are sharing the striking new composite image of a dramatic galaxy merger.

Arp 220IC 4553ALMAHubble Space Telescope

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Evidence

• ALMA and Hubble image of Arp 220, also known as IC 4553. A merger of two spiral galaxies set of a burst of star formation, backlighting the dust lanes in the Hubble visible light view. The red dots are millimeter wavelength light from ALMA, showing emission from molecules like… · ArpBot · 3

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