The Spitzer Survey of Interstellar Clouds in the Gould Belt. III. A Multi-Wavelength View of Corona Australis

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Date

2011-06

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Peterson, Dawn E.
Garatti, Alessio Caratti O.
Bourke, Tyler L.
Forbrich, Jan
Gutermuth, Robert A.
Jorgensen, Jes K.
Allen, Lori E.
Patten, Brian M.
Dunham, Michael M.
Harvey, Paul M.

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Abstract

We present Spitzer Space Telescope IRAC and MIPS observations of a 0.85 deg(2) field including the Corona Australis (CrA) star-forming region. At a distance of 130 pc, CrA is one of the closest regions known to be actively forming stars, particularly within its embedded association, the Coronet. Using the Spitzer data, we identify 51 young stellar objects (YS0s) in CrA which include sources in the well-studied Coronet cluster as well as sources distributed throughout the molecular cloud. Twelve of the YSOs discussed are new candidates, one of which is located in the Coronet. Known YSOs retrieved from the literature are also added to the list, and a total of 116 candidate YSOs in CrA are compiled. Based on these YSO candidates, the star Formation rate is computed to be 12M(circle dot) Myr(-1), similar to that of the Lupus clouds. A clustering analysis was also performed, finding that the main cluster core, consisting of 68 members, is elongated (having an aspect ratio of 2.36), with a circular radius of 0.59 pc and mean surface density of 150 pc(-2). In addition, we analyze outflows and jets in CrA by means of new CO and H-2 data. We present 1 3 mm interferometric continuum observations made with the Submillimeter Array (SMA) covering R CrA, IRS 5, IRS 7, and IRAS 18595-3712 (IRAS 32). We also present multi-epoch H2 maps and detect jets and outflows, study their proper motions, and identify exciting sources. The Spitzer and ISAAC/VET observations of IRAS 32 show a bipolar precessing jet, which drives a CO(2-1) outflow detected in the SMA observations. There is also clear evidence for a parsec-scale precessing outflow, which is east west oriented and originates in the SMA 2 region and likely driven by SMA 2 or IRS 7A.

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Peterson, Dawn E., Alessio Caratti o Garatti, Tyler L. Bourke, Jan Forbrich, Robert A. Gutermuth, Jes K. Jørgensen, Lori E. Allen et al. "The Spitzer Survey of Interstellar Clouds in the Gould Belt. III. A Multi-wavelength View of Corona Australis." The Astrophysical Journal Supplement Series, Vol. 194, No. 2 (Jun., 2011): 43.