This galaxy cluster is just chillaxing.
The cosmic microwave background is the first light in the universe, a.k.a., Cazadilla notes. When low-energy microwave photons encounter a galaxy cluster on their way to Earth, they’re scattered to higher energies by the gas, or the plasma inside of the galaxy cluster,” he says. The gaps left behind by those amped-up photons show up as shadows against the cosmic microwave background, giving a rough idea of where the cluster is.
The intracluster gas of a galaxy cluster typically cools over time, first emitting X-rays, then cooling to emit ultraviolet light, and finally, emitting electromagnetic wavelengths down to the infrared region, he explains. “We can catch each part of this process at different wavelengths, using these different telescopes.”Normally, the cooling gas shared in a galaxy cluster slowly falls inward, forming and feeding a central galaxy that tends to dominate the others, Calzadilla says.
But what’s interesting about SPT2215, he adds, is that “it looks like that thermostat is having a hard time keeping up with the amount of cooling that’s going on.” That gives it a chillier aura than expected , with the gas being projected to cool much faster than in most other galaxy clusters found at a similar time in the universe. The central galaxy also exhibits more new, young stars than a cluster where a black hole kept the gas from cooling too quickly.
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