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Measuring the ionisation fraction in a jet from a massive protostar.

R Fedriani1,2, A Caratti O Garatti3,4, S J D Purser3

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Massive star formation may involve disc accretion, similar to low-mass stars. This study found similar ionization fractions in massive protostellar jets, suggesting a unified shock ionization mechanism across the stellar mass spectrum.

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Area of Science:

  • Astrophysics
  • Star Formation
  • Protostellar Jets

Background:

  • Massive star formation mechanisms are not fully understood.
  • Protostellar jets are crucial for angular momentum removal during stellar collapse.
  • Observing jets from massive stars is challenging due to distance and dust.

Purpose of the Study:

  • To investigate if massive stars form via disc accretion like low-mass stars.
  • To determine the ionization fraction in jets from massive protostars.
  • To compare ionization fractions across the protostellar mass spectrum.

Main Methods:

  • Analyzed spatially coincident infrared and radio emission from the massive protostar G35.20-0.74N.
  • Determined the ionization fraction within the protostellar jet.

Main Results:

  • The ionization fraction in the jet of G35.20-0.74N was found to be approximately 5-12%.
  • This ionization fraction is comparable to values observed in jets from low-mass young stars.

Conclusions:

  • The findings imply a unified shock ionization mechanism in protostellar jets across a wide range of stellar masses, up to at least 10 solar masses.
  • This supports the hypothesis that massive stars may form through disc accretion, similar to their low-mass counterparts.