Feedback in W94A diagnosed with Radio Recombination Lines and Models

Rugel, M. and Rahner, D. and Beuther, H and Pellegrini, E.W. and Wang, Y. and Soler, J.D. and Ott, J. and Brunthaler, A. and Anderson, L.D. and Mottram, J.C. and Henning, T. and Goldsmith, P.F. and Heyer, M. and Klessen, R.S. and Bihr, S. and Menten, K. M. and Smith, R.J. and Urquhart, J.S. and Ragan, S.E. and Glover, S.C.O. and McClure-Griths, N.M. and Bigiel, F. and Roy, N. (2018) Feedback in W94A diagnosed with Radio Recombination Lines and Models. Astronomy & Astrophysics, . ISSN 0004-6361. (In press) (Full text available)

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We present images of radio recombination lines (RRLs) at wavelengths around 18 cm from the star-forming region W49A to determine the kinematics of ionized gas in the THOR survey (The Hi/OH/Recombination line survey of the inner Milky Way) at an angular resolution of 16:08 X 13:08. The distribution of ionized gas appears to be affected by feedback processes from the star clusters inW49A. The velocity structure of the RRLs shows a complex behaviour 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 feedbackdriven 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.

Item Type: Article
Uncontrolled keywords: ISM:bubbles – Hii regions – ISM: individual objects: W49A – ISM: kinematics and dynamics – Radio lines: ISM
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 04 Dec 2018 09:54 UTC
Last Modified: 04 Dec 2018 10:07 UTC
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Urquhart, J.S.:
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