The SOMA Radio Survey. I. Comprehensive SEDs of High-mass Protostars from Infrared to Radio and the Emergence of Ionization Feedback
Review article, 2019

We study centimeter continuum emission of eight high- and intermediate-mass protostars that are part of the SOFIA Massive Star Formation Survey, thus building extended spectral energy distributions (SEDs) from the radio to the infrared. We discuss the morphology seen in the centimeter continuum images, which are mostly derived from archival Very Large Array data, and the relation to infrared morphology. We use the SEDs to test new models of high-mass star formation including radiative and disk-wind feedback and associated free-free and dust continuum emission. We show that interferometric data of the centimeter continuum flux densities provide additional, stringent tests of the models by constraining the ionizing luminosity of the source; they also help to break degeneracies encountered when modeling the infrared-only SEDs, especially for the protostellar mass. Our derived parameters are consistent with physical parameters estimated by other methods, such as dynamical protostellar masses. We find a few examples of additional stellar sources in the vicinity of the high-mass protostars, which may be low-mass young stellar objects. However, the stellar multiplicity of the regions, at least as traced by radio continuum emission, appears to be relatively low.

stars: formation

ISM: jets and outflows

techniques: interferometric


Viviana Rosero

University of Florida

National Radio Astronomy Observatory Socorro

University of Virginia

Kei E.I. Tanaka

Osaka University

National Astronomical Observatory of Japan

University of Florida

Jonathan Tan

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

University of Virginia

J. Marvil

National Radio Astronomy Observatory Socorro

Mengyao Liu

University of Florida

University of Virginia

Yichen Zhang


James M. De Buizer

NASA Ames Research Center

M. T. Beltrán

Arcetri Astrophysical Observatory

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 873 1 20

Subject Categories

Meteorology and Atmospheric Sciences

Astronomy, Astrophysics and Cosmology




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