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Star Formation in Clusters: Early Subclustering in the Serpens Core

Leonardo Testi et al 2000 ApJ 540 L53-L56   doi: 10.1086/312858  Help

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Leonardo Testi1,2, Anneila I. Sargent2, Luca Olmi3 and Joseph S. Onello4
1 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy
2 Division of Physics, Mathematics, and Astronomy, California Institute of Technology, MS 105-24, Pasadena, CA 91125
3 Department of Physics, State University of New York, Cortland, NY 13045
4 Large Millimeter Telescope Project and Five College Radio Astronomy Observatory, University of Massachusetts, 630 Lederle Graduate Research Center, Amherst, MA 01003
E-mail: ltesti@arcetri.astro.it

ABSTRACT. We present high-resolution interferometric and single-dish observations of molecular gas in the Serpens cluster-forming core. Star formation does not appear to be homogeneous throughout the core, but is localized in spatially and kinematically separated subclusters. The stellar (or protostellar) density in each of the subclusters is much higher than the mean for the entire Serpens cluster. This is the first observational evidence for the hierarchical fragmentation of protocluster cores suggested by cluster formation models.

Subject headings: ISM: clouds; radio continuum: ISM; stars: formation

Print publication: Issue 1 (2000 September 1)
Received 2000 March 3, accepted for publication 2000 May 24
Published 2000 August 22

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