Centimeter Imaging of the R Coronae Australis Region
Minho Choi, Kenji Hamaguchi, Jeong-Eun Lee, and Ken'ichi Tatematsu

TL;DR
This study used high-resolution radio observations to reveal complex star-forming activities, multiple protostars, and magnetic phenomena in the R Coronae Australis region, providing new insights into early stellar evolution.
Contribution
It presents the first high-resolution centimeter-wave imaging of R CrA, identifying multiple protostars, outflows, and magnetic activities, advancing understanding of star formation processes.
Findings
Detected a cluster of young stellar objects with active outflows.
Identified nonthermal radio sources indicating magnetic activity.
Suggested early magnetic activity in Class 0/I protostars.
Abstract
The R CrA region was observed in the 3.5 and 6.2 cm continuum with high angular resolutions (0.6--1.7 arcseconds) using the Very Large Array. Archival data sets were also analyzed for comparison, which provided angular resolutions up to 0.3 arcseconds. A cluster of young stellar objects was detected, and a rich array of star forming activities was revealed. IRS 7A showed an enhanced outflow activity recently. The main peak of IRS 7A positionally coincides with an X-ray source, which suggests that the X-ray emission is directly related to the central protostar. The Class 0 source SMA 2 is associated with a double radio source, B 9a and 9b, and seems to be driving two outflows. The B 9 complex is probably a multiple-protostar system. Both B 9a and 9b are nonthermal radio sources with negative spectral indices. IRS 7B is a compact radio source surrounded by an extended structure. The…
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