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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742525.0, MPI für Astronomie / Publikationen_mpia
Large-scale map of millimeter-wavelength hydrogen radio recombination lines around a young massive star cluster
Authors:Nguyễn-Lu’o’ng, Q.; Anderson, L. D.; Motte, F.; Kim, K.-T.; Schilke, P.; Carlhoff, P.; Beuther, H.; Schneider, N.; Didelon, P.; Kramer, C.; Louvet, F.; Nony, T.; Bihr, S.; Rugel, M.; Soler, J.; Wang, Y.; Bronfman, L.; Simon, R.; Menten, K. M.; Wyrowski, F.; Walmsley, C. M.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L25 (7 pp)
Audience:Not Specified
Abstract / Description:We report the first map of large-scale (10 pc in length) emission of millimeter-wavelength hydrogen recombination lines (mm-RRLs) toward the giant H ii region around the W43-Main young massive star cluster (YMC). Our mm-RRL data come from the IRAM 30 m telescope and are analyzed together with radio continuum and cm-RRL data from the Karl G. Jansky Very Large Array and HCO+ 1–0 line emission data from the IRAM 30 m. The mm-RRLs reveal an expanding wind-blown ionized gas shell with an electron density ∼70–1500 cm‑3 driven by the WR/OB cluster, which produces a total Lyα photon flux of 1.5× {10}50 s‑1. This shell is interacting with the dense neutral molecular gas in the W43-Main dense cloud. Combining the high spectral and angular resolution mm-RRL and cm-RRL cubes, we derive the two-dimensional relative distributions of dynamical and pressure broadening of the ionized gas emission and find that the RRL line shapes are dominated by pressure broadening (4–55 {km} {{{s}}}-1) near the YMC and by dynamical broadening (8–36 {km} {{{s}}}-1) near the shell’s edge. Ionized gas clumps hosting ultra-compact H ii regions found at the edge of the shell suggest that large-scale ionized gas motion triggers the formation of new star generation near the periphery of the shell.
Free Keywords:galaxies: star clusters: individual: W43; galaxies: star formation; ISM: clouds; ISM: kinematics and dynamics; radio continuum: ISM; radio lines: ISM
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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