The high-mass stellar population of W49A, traced by 101 H II regions, shows a steep mass function slope (Gamma > 2.5) compared to the standard Salpeter slope of 1.35, implying a deficit of the most massive stars.
The Early Evolution of Massive Stars: Radio Recombination Line Spectra
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abstract
Velocity shifts and differential broadening of radio recombination lines are used to estimate the densities and velocities of the ionized gas in several hypercompact and ultracompact HII regions. These small HII regions are thought to be at their earliest evolutionary phase and associated with the youngest massive stars. The observations suggest that these HII regions are characterized by high densities, supersonic flows and steep density gradients, consistent with accretion and outflows that would be associated with the formation of massive stars.
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The Zero-Age Massive Stellar Population of W49A from VLA Observations
The high-mass stellar population of W49A, traced by 101 H II regions, shows a steep mass function slope (Gamma > 2.5) compared to the standard Salpeter slope of 1.35, implying a deficit of the most massive stars.