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  Feedback in W49A diagnosed with radio recombination lines and models

Rugel, M. R., Rahner, D., Beuther, H., Pellegrini, E. W., Wang, Y., Soler, J. D., et al. (2019). Feedback in W49A diagnosed with radio recombination lines and models. Astronomy and Astrophysics, 622.

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 Creators:
Rugel, M. R.1, Author
Rahner, D.1, Author
Beuther, H.1, Author
Pellegrini, E. W.1, Author
Wang, Y.1, Author
Soler, J. D.1, Author
Ott, J.1, Author
Brunthaler, A.1, Author
Anderson, L. D.1, Author
Mottram, J. C.1, Author
Henning, T.1, Author
Goldsmith, P. F.1, Author
Heyer, M.1, Author
Klessen, R. S.1, Author
Bihr, S.1, Author
Menten, K. M.1, Author
Smith, R. J.1, Author
Urquhart, J. S.1, Author
Ragan, S. E.1, Author
Glover, S. C. O.1, Author
McClure-Griffiths, N. M.1, AuthorBigiel, F.1, AuthorRoy, N.1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: ISM: bubbles HII regions ISM: individual objects: W49A ISM: kinematics and dynamics radio lines: ISM Astrophysics - Astrophysics of Galaxies
 Abstract: We present images of radio recombination lines (RRLs) at wavelengths around 17 cm from the star-forming region W49A to determine the kinematics of ionized gas in the THOR survey (The H I/OH/Recombination line survey of the inner Milky Way) at an angular resolution of 16.''8 13.''8. The distribution of ionized gas appears to be affected by feedback processes from the star clusters in W49A. The velocity structure of the RRLs shows a complex behavior with respect to the molecular gas. We find a shell-like distribution of ionized gas as traced by RRL emission surrounding the central cluster of OB stars in W49A. We describe the evolution of the shell with the recent feedback model code WARPFIELD that includes the important physical processes and has previously been applied to the 30 Doradus region in the Large Magellanic Cloud. The cloud structure and dynamics of W49A are in agreement with a feedback-driven shell that is re-collapsing. The shell may have triggered star formation in other parts of W49A. We suggest that W49A is a potential candidate for star formation regulated by feedback-driven and re-collapsing shells.

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 Dates: 2019
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 622 Sequence Number: - Start / End Page: - Identifier: -