Abstract
The parameters of the radiation of interstellar matter in star-forming complexes in the high-metallicity galaxies NGC 628, NGC 2976, and NGC 3351, which have different morphological types, are analyzed. The relationship between the emission in Hα and in lines of CO and HI is considered, as well as the relationship between Hα and the emission of dust in the infrared range (IR). The fluxes and surface brightnesses in the UV and IR correlate well with the Hα emission. The HI emission also correlates well with Hα, while the correlation between the CO and Hα emission is much weaker. The ratio of the fluxes at 8 and 24 µm decreases with increasing Hα flux. This may be due to changes in the properties of the dust ensemble (a decrease in the mass fraction of polycyclic aromatic hydrocarbons) or to changing excitation conditions. Analysis of the kinematics of the CO lines shows that the CO flux grows with increasing velocity scatter ΔV when ΔV ≾ 70 km/s. Preliminary evidence for the existence of star-forming complexes with higher values of ΔV is provided, when the increase in the velocity scatter is accompanied by a decrease in the CO luminosity of the complex.
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Acknowledgments
We thank the referee for important comments and useful improvements of the quality of the manuscript. This study was based in part on observational data obtained by the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This work is also based on observations carried out with the IRAM NOEMA Interferometer [30-m telescope]. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).
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Russian Text © The Author(s), 2019, published in Astronomicheskii Zhurnal, 2019, Vol. 96, No. 6, pp. 456–471.
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Smirnova, K.I., Wiebe, D.S. Studies of Star-forming Complexes in the Galaxies NGC 628, NGC 2976, and NGC 3351. Astron. Rep. 63, 445–459 (2019). https://doi.org/10.1134/S1063772919060040
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DOI: https://doi.org/10.1134/S1063772919060040