Suppressed star formation in the early universe


Suppressed star formation in the early universe

A galaxy cluster map showing the density of galaxies in the massive SPT-CLJ 0421 buttons. Symbols show the positions of individual galaxies and the circle marks the position of the SPT detection. Credit: Strazzoul et al. 2019

Massive clusters of galaxies, some more crowded than a hundred Milky Way galaxies, have been detected by cosmic epic tears as early as about 3 billion years after the great blow. Their ongoing star formation makes them bright enough to be detected at these distances. The clusters are predicted by cosmological evolution, but their properties are very uncertain. Astronomers agree that the evolution of stars in the universe is particularly interested in the Cluster because of their abundance of stars and activity.

Star formation in galaxies is by no means a steady process. Not only can it be bursting with activity, prompted perhaps by a collision with a neighboring galaxy, but the opposite may happen. Star formation can be self-limiting because of its massive young star producing winds and supernova, which can separate the natural molecular clouds and disable future star formation. Combined with the disruption induced by jets of an active nuclear supermassive black hole, this disruptive process is called quenching and is thought to be able to bring star formation to a halt. Whether or not this occurs in the early universe, and when and how it works, is a key area of ​​comic research.

CFA astronomers Matt Ashby and Esra Bulbul are members of the South Pole Telescope (SPT) team who discovered and studied massive galactic clusters in the early universe. They recently completed a follow-up study of star formation and the stellar populations in most remote clusters found in the SPT surveys. Using the Iraq Unit on the Spitz Space Telescope along with the Hubble Space Telescope Vid Field Camera, they tried five clusters in the Epoch about 4.5 billion years after this great blow, a time when galaxies in general are especially active in producing new ones. Stars. This size is exceptionally rare, and is the first such study ever done.

Using the infrared colors of the galaxies at the selected SPT clusters, these scientists are able to characterize the star and star formation activity. The scientists found that, interestingly, in this epic, the massive clusters tend to host a mixture of galaxy types with quasi-galaxies being quite common. Apparently in the quarreling cluster members the quenching of star formation has already occurred. The astronomers conclude that star formation can be suppressed in the central regions of the massive clusters, even in the early cosmic epic, when the most intense formation of stars.

Star formation in remote galaxy clusters

More information:
L strzzzullo et al. Galaxy populations in the most remote SPT-SZ clusters, Astronomy & Astrophysics (2019). Du: 10.1051 / 0004-6361 / 201833944

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Harvard Smithsonian Center for Astrophysics

Suppressed star formation in the early universe (2019, May 10)
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