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An extragalactic supernebula confined by gravity.

J L Turner1, S C Beck, L P Crosthwaite

  • 1Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1562, USA. turner@astro.ucla.edu

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|June 6, 2003
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Summary

The origins of globular clusters remain mysterious. Researchers studied a young star cluster in NGC5253, finding gravity may confine gas despite stellar winds, offering clues to cluster formation.

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Area of Science:

  • Astronomy
  • Astrophysics
  • Cosmic Evolution

Background:

  • Globular clusters are dense stellar systems, but their formation mechanisms are poorly understood.
  • Young, massive stars are expected to disperse gas via radiation pressure and stellar winds, hindering cluster formation.
  • Ancient globular clusters in our galaxy offer limited insight into early formation processes.

Purpose of the Study:

  • To investigate the formation of young, massive star clusters.
  • To understand the role of gravity and stellar winds in gas confinement within nascent clusters.
  • To explore the origins of globular clusters using observations of a nearby starburst galaxy.

Main Methods:

  • Measured infrared hydrogen recombination lines from the super star cluster in NGC5253.
  • Analyzed gas heating attributed to approximately one million stars, including 4,000-6,000 massive 'O' stars.
  • Observed the cluster's enshrouded state due to gas and dust, obscuring optical visibility.

Main Results:

  • Detected hydrogen recombination lines indicating gas heated by a massive young star cluster.
  • The cluster hosts an estimated one million stars, with a significant population of massive 'O' stars.
  • Evidence suggests gravitational forces are confining the gas within the cluster, counteracting stellar winds.

Conclusions:

  • Gravitational confinement may explain how star clusters survive the dispersal effects of young, massive stars.
  • The observed phenomena in NGC5253 provide a potential model for the formation of young, obscured star clusters.
  • This study offers insights into the early stages of globular cluster evolution in starbursting galaxies.