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A hidden cluster containing thousands of young stars has been discovered by Israeli scientists

A team of astronomers from Tel Aviv University and UCLA found that a dense cluster containing thousands of young stars, in the galaxy NGC5253, wraps itself in a veil of concealment due to its great gravitational attraction.

Tel Aviv University

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A team of astronomers from Tel Aviv University and UCLA found that a dense cluster containing thousands of young stars, in the galaxy NGC5253, wraps itself in a veil of concealment due to its great gravitational pull. The cluster cannot be observed in visible light because it is hidden by a thick cloud of gas and dust, but Prof. Sarah Beck from Tel Aviv University and Prof. Jean Turner and her colleagues from UCLA observed the cluster in radio and Mc-Red radiation. The research team found that there are about a million stars in the cluster, of which five thousand are bright and hot O-type stars, and that the size of the cluster is only 3 light-years (the shortest distance between the Sun and the nearest star to us). This star cluster is an enigma. Bright O stars are very active and emit strong winds, so that gas around them typically spreads at speeds of 100 km per second (360,000 km per hour). Why didn't the many O stars throw the gas around the cluster? The astronomers measured the movement of the gas precisely, using advanced instruments in the Keck telescope. They found that the gas spreads but at much lower speeds than expected, in a way that does not allow it to escape from the cluster - the enormous gravitational force of the large number of stars in a small area slows down the movement of the gas. This is the first massive and dense star cluster observed to trap the gas around it, but there are probably many sites like it that have not yet been discovered.
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