As these two galaxies merge, it's triggering abundant star formation and relasing the light of a trillion Suns.
‘s collision triggered a massive episode of star birth, and the combined light is equal to one trillion Suns. That number humbles our own galaxy, which is as bright as about one billion Suns. Each of the galactic cores in ARP 220 is encircled by a rotating, star-forming ring, and these rings are the source of all this infrared energy. The light from all that starburst creates a prominent, spiked feature that dominates the image.
Dust blocks much of the light from ARP 220, as images from other telescopes show. In the Hubble image below, much of the detail that the more powerful JWST reveals is obscured. This image from the 2017 paper shows the East and West nuclear gas disks in ARP 220. The western nucleus has a dust column so dense that it’s like a 30 cm thick wall of gold. Image Credit: Scoville et al. 2017.
that studied both supernovae and supernova remnants , the authors found that ARP 220 had a total SN rate of 4 yr. Compare that to the Milky Way’s much lower rate of supernovae which is about one every 50 years. In fact, in 2011, astronomers identified seven supernovae at the same time in ARP 220 that all exploded in the previous 60 years.
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