SIMBAD references

2019ApJ...882...11A - Astrophys. J., 882, 11-11 (2019/September-1)

The origin of [C II] 158 µm emission toward the H II region complex S235.

ANDERSON L.D., MAKAI Z., LUISI M., ANDERSEN M., RUSSEIL D., SAMAL M.R., SCHNEIDER N., TREMBLIN P., ZAVAGNO A., KIRSANOVA M.S., OSSENKOPF-OKADA V. and SOBOLEV A.M.

Abstract (from CDS):

Although the 2P3/2-2P1/2 transition of [C II] at λ ≃ 158 µm is known to be an excellent tracer of active star formation, we still do not have a complete understanding of where within star formation regions the emission originates. Here, we use SOFIA upGREAT observations of [C II] emission toward the H II region complex Sh2-235 (S235) to better understand in detail the origin of [C II] emission. We complement these data with a fully sampled Green Bank Telescope radio recombination line map tracing the ionized hydrogen gas. About half of the total [C II] emission associated with S235 is spatially coincident with ionized hydrogen gas, although spectroscopic analysis shows little evidence that this emission is coming from the ionized hydrogen volume. Velocity-integrated [C II] intensity is strongly correlated with Wide-field Infrared Survey Explorer (WISE) 12 µm intensity across the entire complex, indicating that both trace ultraviolet radiation fields. The 22 µm and radio continuum intensities are only correlated with [C II] intensity in the ionized hydrogen portion of the S235 region and the correlations between the [C II] and molecular gas tracers are poor across the region. We find similar results for emission averaged over a sample of external galaxies, although the strength of the correlations is weaker. Therefore, although many tracers are correlated with the strength of [C II] emission, only WISE 12 µm emission is correlated on small scales of the individual H II region S235 and also has a decent correlation at the scale of entire range of galaxies. Future studies of a larger sample of Galactic H II regions would help to determine whether these results are truly representative.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): H II regions - infrared: ISM - radio continuum: ISM - techniques: photometric

Simbad objects: 17

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2020.08.05-07:15:54

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