VISCOUS BOUNDARY LAYERS of RADIATION-DOMINATED, RELATIVISTIC JETS. II. the FREE-STREAMING JET MODEL

Eric R. Coughlin, Mitchell C. Begelman

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We analyze the interaction of a radiation-dominated jet and its surroundings using the equations of radiation hydrodynamics in the viscous limit. In a previous paper we considered the two-stream scenario, which treats the jet and its surroundings as distinct media interacting through radiation viscous forces. Here we present an alternative boundary layer model, known as the free-streaming jet model - where a narrow stream of fluid is injected into a static medium - and present solutions where the flow is ultrarelativistic and the boundary layer is dominated by radiation. It is shown that these jets entrain material from their surroundings and that their cores have a lower density of scatterers and a harder spectrum of photons, leading to observational consequences for lines of sight that look "down the barrel of the jet." These jetted outflow models may be applicable to the jets produced during long gamma-ray bursts and super-Eddington phases of tidal disruption events.

Original languageEnglish (US)
Article number2
JournalAstrophysical Journal
Volume809
Issue number1
DOIs
StatePublished - Aug 10 2015
Externally publishedYes

Keywords

  • galaxies: jets
  • gamma-ray burst: general
  • radiation: dynamics
  • relativistic processes

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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