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Feedback in W49A diagnosed with radio recombination lines and models

Rugel, M; Rahner, D.; Beuther, H.; Pellegrini, E.; Wang, Y.; Soler, Juan Diego; Ott, Juergen; Brunthaler, A; Anderson, Loren D; Mottram, J.C.; McClure-Griffiths, Naomi

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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 x 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...[Show more]

dc.contributor.authorRugel, M
dc.contributor.authorRahner, D.
dc.contributor.authorBeuther, H.
dc.contributor.authorPellegrini, E.
dc.contributor.authorWang, Y.
dc.contributor.authorSoler, Juan Diego
dc.contributor.authorOtt, Juergen
dc.contributor.authorBrunthaler, A
dc.contributor.authorAnderson, Loren D
dc.contributor.authorMottram, J.C.
dc.contributor.authorMcClure-Griffiths, Naomi
dc.date.accessioned2022-03-10T02:46:34Z
dc.date.available2022-03-10T02:46:34Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/261971
dc.description.abstractWe 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 x 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.
dc.description.sponsorshipWe would like to thank the referee for the detailed, helpful, and insightful comments, which considerably improved the paper. M.R.R. is a fellow of the International Max Planck Research School for Astronomy and Cosmic Physics (IMPRS) at the University of Heidelberg. H.B., M.R.R., Y.W., J.S. and J.C.M. acknowledge support from the European Research Council under the Horizon 2020 Framework Program via the ERC Consolidator Grant CSF-648505. M.R.R., D.R., H.B., E.W.P., S.C.O.G. and R.S.K. acknowledge support from the Deutsche Forschungsgemeinschaft (DFG) via Sonderforschungsbereich (SFB) 881 “The Milky Way System” (sub-projects B1, B2 and B8). S.C.O.G., E.W.P. and R.S.K. further acknowledge support from the DFG via Priority Program SPP 1573 “Physics of the Interstellar Medium” (grant numbers KL1358/18.1, KL 1358/19.2, and GL 668/2–1) and from the European Research Council via the ERC Advanced Grant STARLIGHT (project number 339177). The research was carried out in part at the Jet Propulsion Laboratory, which is operated forNASA by the California Institute of Technology. R.J.S. acknowledges support from an STFC Ernest Rutherford fellowship. S.E.R. acknowledges support from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement # 706390. F.B. acknowledges funding from the European Union’s Horizon 2020 research and innovation programme (grant agreement No 726384 – EMPIRE).
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherEDP Sciences
dc.rights© 2019 The Authors
dc.sourceAstronomy and Astrophysics
dc.subjectISM: bubbles
dc.subjectHII regions
dc.subjectISM: individual objects: W49A
dc.subjectISM: kinematics and dynamics
dc.subjectradio lines: ISM
dc.titleFeedback in W49A diagnosed with radio recombination lines and models
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume622
dc.date.issued2019
local.identifier.absfor020204 - Plasma Physics; Fusion Plasmas; Electrical Discharges
local.identifier.absfor020201 - Atomic and Molecular Physics
local.identifier.absfor020106 - High Energy Astrophysics; Cosmic Rays
local.identifier.ariespublicationu3102795xPUB701
local.publisher.urlhttp://www.aanda.org/
local.type.statusPublished Version
local.contributor.affiliationRugel, M, Max-Planck-Institute for Astronomy
local.contributor.affiliationRahner, D., Universität Heidelberg
local.contributor.affiliationBeuther, H., Max Planck Institute for Astronomy
local.contributor.affiliationPellegrini, E., Zentrum für Astronomie der Universität Heidelberg
local.contributor.affiliationWang, Y., Max Planck Institute for Astronomy
local.contributor.affiliationSoler, Juan Diego, Max-Planck Institute for Astronomy
local.contributor.affiliationOtt, Juergen, National Radio Astronomy Observatory
local.contributor.affiliationBrunthaler, A, Max Planck Institute for Radio Astronomy
local.contributor.affiliationAnderson, Loren D, West Virginia University
local.contributor.affiliationMottram, J.C., Max Planck Institute for Astronomy
local.contributor.affiliationMcClure-Griffiths, Naomi, College of Science, ANU
local.bibliographicCitation.issueA48
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage17
local.identifier.doi10.1051/0004-6361/201834068
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2020-12-20T07:25:52Z
local.identifier.scopusID2-s2.0-85060886705
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/11142/... "author can archive publisher's version/PDF" from SHERPA/RoMEO site as at 09/03/2022
CollectionsANU Research Publications

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