Large-scale Map of Millimeter-wavelength Hydrogen Radio Recombination Lines around a Young Massive Star Cluster - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Letters Year : 2017

Large-scale Map of Millimeter-wavelength Hydrogen Radio Recombination Lines around a Young Massive Star Cluster

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Q. Nguyen-Luong
  • Function : Author
L. D. Anderson
  • Function : Author
Kee-Tae Kim
P. Schilke
P. Carlhoff
  • Function : Author
H. Beuther
  • Function : Author
N. Schneider
  • Function : Author
P. Didelon
  • Function : Author
C. Kramer
  • Function : Author
F. Louvet
  • Function : Author
S. Bihr
  • Function : Author
M. Rugel
  • Function : Author
J. Soler
  • Function : Author
Y. Wang
  • Function : Author
L. Bronfman
  • Function : Author
R. Simon
  • Function : Author
K. M. Menten
  • Function : Author
F. Wyrowski
  • Function : Author

Abstract

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.

Dates and versions

insu-03692488 , version 1 (09-06-2022)

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Cite

Q. Nguyen-Luong, L. D. Anderson, F. Motte, Kee-Tae Kim, P. Schilke, et al.. Large-scale Map of Millimeter-wavelength Hydrogen Radio Recombination Lines around a Young Massive Star Cluster. The Astrophysical Journal Letters, 2017, 844, ⟨10.3847/2041-8213/aa7d48⟩. ⟨insu-03692488⟩
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