Identifying a Proto-Super Star Cluster

star-cluster.pngSuper star clusters (SSCs) are considered to be the birth zones of stellar globular clusters, and a key aspect of star formation in galaxies. Johnson et al. have used ALMA and the VLA to identify the youngest such system: a 24 parsec radius molecular cloud with a molecular gas mass > 5 x 106 M⊙, in the Antennae merging galaxy system. This proto-SSC has yet to initiate star formation. They conclude that the clouds must be short-lived (< 1 Myr), and pressure-confined by a medium with 104 times typical interstellar medium (ISM) pressures. 

Image: ALMA and VLA images of the molecular gas and thermal continuum emission in the proto-superstar cluster in the Antennae galaxies 

Science Team: K.E. Johnson (University of Virginia), A.K. Leroy (NRAO), R. Indebetouw (University of Virginia, NRAO), C.L. Brogan (NRAO), B.C. Whitmore (STScI), J. Hibbard (NRAO), K. Sheth (NRAO), and A.S. Evans (University of Virginia, NRAO).

Publication: The Physical Conditions in a Pre-super Star Cluster Molecular Cloud in the Antennae Galaxies, 2015, Astrophysical Journal, 806, 35.

Connect with NRAO

The National Radio Astronomy Observatory and Green Bank Observatory are facilities of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.

The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."

AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.