The role of thermal pressure in jet launching

Noam Soker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Abstract I present and discuss a unified scheme for jet launching that is based on stochastic dissipation of the accretion disk kinetic energy, mainly via shock waves. In this scheme, termed thermally-launched jet model, the kinetic energy of the accreted mass is transferred to internal energy, e.g., heat or magnetic energy. The internal energy accelerates a small fraction of the accreted mass to high speeds and form jets. For example, thermal energy forms a pressure gradient that accelerates the gas. A second acceleration stage is possible wherein the primary outflow stretches magnetic field lines. The field lines then reconnect and accelerate small amount of mass to very high speeds. This double-stage acceleration process might form highly relativistic jets from black holes and neutron stars. The model predicts that detail analysis of accreting brown dwarfs that launch jets will show the mass accretion rate to be BD 109 108 M yr1, which is higher than present claims in the literature.

Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalProceedings of the International Astronomical Union
Issue number1 S243
StatePublished - Aug 2007
Externally publishedYes


  • ISM: jets and outflows
  • Stars: formation

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