Millimeter and submillimeter survey of the R coronae australis region

Christopher E. Groppi, Craig Kulesa, Christopher Walker, Christopher L. Martin

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Using a combination of data from the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO), the Arizona Radio Observatory Kitt Peak 12 m telescope, and the Arizona Radio Observatory 10 m Heinrich Hertz Telescope, we have studied the most active part of the R CrA molecular cloud in multiple transitions of carbon monoxide, HCO+, and 870 μm continuum emission. Since R CrA is nearby (130 pc), we are able to obtain physical spatial resolution as high as 0.01 pc over an area of 0.16 pc2, with velocity resolution finer than 1 km s-1. Mass estimates of the protostar driving the millimeter-wave emission derived from HCO+, dust continuum emission, and kinematic techniques point to a young, deeply embedded protostar of ∼0.5-0.75 M, with a gaseous envelope of similar mass. A molecular outflow is driven by this source that also contains at least 0.8 M of molecular gas with ∼0.5 L of mechanical luminosity. HCO+ lines show the kinematic signature of infall motions, as well as bulk rotation. The source is most likely a Class 0 protostellar object not yet visible at near-IR wavelengths. With the combination of spatial and spectral resolution in our data set, we are able to disentangle the effects of infall, rotation, and outflow toward this young object.

Original languageEnglish (US)
Pages (from-to)946-955
Number of pages10
JournalAstrophysical Journal
Volume612
Issue number2 I
DOIs
StatePublished - Sep 10 2004

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Keywords

  • ISM: clouds
  • ISM: individual (Corona Australis Cloud)
  • ISM: jets and outflows
  • ISM: kinematics and dynamics
  • ISM: molecules
  • Stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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