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HyGAL: Characterizing the Galactic Interstellar Medium with Observations of Hydrides and Other Small Molecules. I. Survey Description and a First Look Toward W3(OH), W3 IRS5, and NGC 7538 IRS1

Authors: A. M. Jacob, D. A. Neufeld, P. Schilke, H. Wiesemeyer, W.-J. Kim, S. Bialy, M. Busch, D. Elia, E. Falgarone, M. Gerin, B. Godard, R. Higgins, P. Hennebelle, N. Indriolo, D. C. Lis, K. M. Menten, A. Sanchez-Monge, T. Möller, V. Ossenkopf-Okada, M. R. Rugel, D. Seifried, P. Sonnentrucker, S. Walch, M. G. Wolfire, F. Wyrowski, V. Valdivia

A. M. Jacob et al 2022 The Astrophysical Journal 930 .

Provider: AAS Journals

Caption: Figure 16.

Demonstration of the XCLASS fits to both the [C II] and [¹³C II] features toward W3 IRS5. Top: the simultaneous fit in red overlaid on the spectrum in black. Middle: a zoom-in on the spectrum and fits, where the blue shaded curves highlight the XCLASS fit to the [¹³C II] hyperfine-structure lines. Bottom: individual [C II] foreground absorption components in gray with the self-absorption feature seen near the systemic velocity of the source highlighted in red.

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