The Spitzer Survey of Interstellar Clouds in the Gould Belt. III. A Multi-wavelength View of Corona Australis
- Autor(en)
- Dawn E. Peterson, Alessio Caratti o Garatti, Tyler L. Bourke, Jan Forbrich, Robert A. Gutermuth, Jes K. Jørgensen, Lori E. Allen, Brian M. Patten, Michael M. Dunham, Paul M. Harvey, Bruno Merín, Nicholas L. Chapman, Lucas A. Cieza, Tracy L. Huard, Claudia Knez, Brian Prager, Neal J. Evans
- Abstrakt
We present Spitzer Space Telescope IRAC and MIPS observations of a 0.85deg2 field including the Corona Australis (CrA) star-formingregion. At a distance of 130 pc, CrA is one of the closest regions knownto be actively forming stars, particularly within its embedded association, the Coronet. Using the Spitzer data, we identify 51 young stellar objects (YSOs) 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 islocated in the Coronet. Known YSOs retrieved from the literature arealso added to the list, and a total of 116 candidate YSOs in CrA arecompiled. Based on these YSO candidates, the star formation rate iscomputed to be 12 M sun Myr-1, similar to that ofthe 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 meansurface density of 150 pc-2. In addition, we analyze outflows and jets in CrA by means of new CO and H2 data. We present 1.3 mm interferometric continuum observations made with the Submillimeter Array (SMA) covering R CrA, IRS 5, IRS 7, and IRAS18595-3712 (IRAS 32). We also present multi-epoch H2 maps anddetect jets and outflows, study their proper motions, and identify exciting sources. The Spitzer and ISAAC/VLT 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.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Harvard-Smithsonian Center for Astrophysics, California Institute of Technology (Caltech), Natural History Museum of Denmark, National Optical Astronomy Observatory, Tucson, Dublin Institute for Advanced Studies, Smith College, University of Massachusetts, Amherst, University of Texas, Austin, European Space Astronomy Centre (ESA), University of Hawaii at Manoa, University of Maryland, College Park
- Journal
- The Astrophysical Journal Supplement Series
- Band
- 194
- Anzahl der Seiten
- 43
- ISSN
- 0067-0049
- DOI
- https://doi.org/10.1088/0067-0049/194/2/43
- Publikationsdatum
- 06-2011
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103004 Astrophysik
- Schlagwörter
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/d36b48b4-7169-4e74-9205-9c78be5c8dbf