2021ApJ...909...93R -
Astrophys. J., 909, 93-93 (2021/March-1)
The Carina Nebula and Gum 31 molecular complex. III. The distribution of the 1-3 GHz radio continuum across the whole nebula.
REBOLLEDO D., GREEN A.J., BURTON M.G., BREEN S.L. and GARAY G.
Abstract (from CDS):
We report the most detailed 1-3 GHz radio continuum emission map of the nearest region of massive-star formation, the Carina Nebula. As part of a large program with the Australia Telescope Compact Array, we have covered ∼12 deg2, achieving an angular resolution of ∼16'', representing the largest and most complete map of the radio continuum to date. Our continuum map shows a spectacular and complex distribution of emission across the nebula, with multiple structures such as filaments, shells, and fronts across a wide range of size scales. The ionization fronts have advanced far into the southern and northern region of the Galactic plane, as fronts are clearly detected at distances of ∼80 pc from the stellar clusters in the center. We estimated an ionization photon luminosity QH = (7. 8 ± 0.8) x 1050 s–1, which corresponds to ∼85% of the total value obtained from stellar population studies. Thus, approximately 15% of the ionizing flux has escaped from the nebula into the diffuse Galactic interstellar medium. Comparison between radio continuum and the hydrogen atomic and molecular gas maps offers a clear view of the bipolar outflow driven by the energy released by the massive stellar clusters that also affects the fraction of molecular gas across the nebula. Comparison between 8 µm and 70 µm emission maps and the radio continuum reveals how the hot gas permeates through the molecular cloud; shapes the material into features such as pillars, small shells, and arc-like structures; and ultimately escapes.
Abstract Copyright:
© 2021. The American Astronomical Society. All rights reserved.
Journal keyword(s):
H II regions - Radio continuum emission - Star-forming regions - Interstellar radiation field - Massive stars - Ionization - Photoionization - Radio astronomy
Simbad objects:
18
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