The Origin of [C ii] 158 μ m Emission toward the H ii Region Complex S235

Autor: A. M. Sobolev, Z. Makai, M. R. Samal, Annie Zavagno, Maria S. Kirsanova, Pascal Tremblin, Morten Andersen, D. Russeil, Matteo Luisi, L. D. Anderson, Volker Ossenkopf-Okada, Nicola Schneider
Přispěvatelé: West Virginia University [Morgantown], Gemini Observatory [Southern Operations Center], Association of Universities for Research in Astronomy (AURA), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Physical Research Laboratory [Ahmedabad] (PRL), Indian Space Research Organisation (ISRO), Universität zu Köln, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institute of Astronomy of the Russian Academy of Sciences (INASAN), Russian Academy of Sciences [Moscow] (RAS), Ural State University, Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Universität zu Köln = University of Cologne, ANR-16-CE92-0035,GENESIS,GENeration et Evolution des Structures du milieu InterStellaire(2016)
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: The Astrophysical Journal
The Astrophysical Journal, American Astronomical Society, 2019, 882 (1), pp.11. ⟨10.3847/1538-4357/ab1c59⟩
The Astrophysical Journal, 2019, 882 (1), pp.11. ⟨10.3847/1538-4357/ab1c59⟩
Astrophys. J.
Astrophysical Journal
ISSN: 0004-637X
1538-4357
DOI: 10.3847/1538-4357/ab1c59⟩
Popis: Although the 2P3/2-2P1/2 transition of [CII] at 158um 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 [CII] emission toward the HII region complex Sh2-235 (S235) to better understand in detail the origin of [CII] 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 [CII] 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 [CII] intensity is strongly correlated with WISE 12um intensity across the entire complex, indicating that both trace ultra-violet radiation fields. The 22um and radio continuum intensities are only correlated with [CII] intensity in the ionized hydrogen portion of the S235 region and the correlations between the [CII] 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 [CII] emission, only WISE 12um emission is correlated on small-scales of the individual HII region S235 and also has a decent correlation at the scale of entire galaxies. Future studies of a larger sample of Galactic HII regions would help to determine whether these results are truly representative.
Comment: Accepted to ApJ
Databáze: OpenAIRE
Externí odkaz: