Abstract
We performed photometric observations of the S 255, S 257, S 140, NGC 7358, and the Orion Bar photo-dissociation regions (PDRs) at 2 \(\mu\)m using narrow-band filters centered on the Br\(\gamma\), H\({}_{2}\), and [Fe II] lines, as well as the narrow-band \(K_{\textrm{cont}}\) and the broad-band \(H\) filters for continuum subtraction. The observations were done with the 2.5-m telescope of the SAI Caucasian Mountain Observatory and the near-infrared camera and spectrograph ASTRONIRCAM. We find several high-density arc-like structures in the Br\(\gamma\) and [Fe II] images of the ionized gas in NGC 7538 and extended shells and arcs visible through the H\({}_{2}\) emission. The H ionization front and H\({}_{2}\) dissociation front are merged in NGC 7538. In S 255 and S 257 we detected only Br\(\gamma\) emission from the H II regions and bright H\({}_{2}\) emission from the PDRs. The projected distance between the H ionization and H\({}_{2}\) dissociation fronts is approximately 0.3–0.4 pc, which cannot be explained using models of a uniform medium. Most probably, the ionized and neutral gas in these PDRs is clumpy. The H I-to-H\({}_{2}\) transitions in the NGC 7538, S 255, S 257 and S 140 PDRs are gradual with no sharp borders. This conclusion also agrees with the suggestion of a clumpy medium.
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ACKNOWLEDGEMENTS
We are thankful to A.P. Topchieva, O.L. Ryabukhina, A.I. Buslaeva and A.V. Moiseev for discussions during the preparation of this manuscript. The work of M.S. Kirsanova, P.A. Boley, and D.S. Wiebe was supported by the Russian Science Foundation, grant No. 21-12-00373. The work of A.M. Tatarnikov was supported by the Scientific Educational School of Lomonosov Moscow State University ‘‘Fundamental and applied Space Research’’.
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Kirsanova, M.S., Tatarnikov, A.M., Boley, P.A. et al. Near Infrared View on the Photo-Dissociation Regions S 255, S 257, NGC 7538, and S 140. Astrophys. Bull. 78, 372–383 (2023). https://doi.org/10.1134/S199034132360014X
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DOI: https://doi.org/10.1134/S199034132360014X