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Subphotospheric Turbulence as a Heating Mechanism in Gamma-Ray Bursts
Columbia Univ, Phys Dept, 538 West 120th St, New York, NY 10027 USA.;Columbia Univ, Columbia Astrophys Lab, 538 West 120th St, New York, NY 10027 USA..ORCID iD: 0000-0002-1895-6516
Columbia Univ, Phys Dept, 538 West 120th St, New York, NY 10027 USA.;Columbia Univ, Columbia Astrophys Lab, 538 West 120th St, New York, NY 10027 USA.;Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85741 Garching, Germany..
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics. AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden..ORCID iD: 0000-0002-0642-1055
2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 885, no 1, article id 30Article in journal (Refereed) Published
Abstract [en]

We examine the possible role of turbulence in feeding the emission of gamma-ray bursts (GRBs). Turbulence may develop in a GRB jet as the result of hydrodynamic or current-driven instabilities. The jet carries dense radiation and the turbulence cascade can be damped by Compton drag, passing kinetic fluid energy to photons through scattering. We identify two regimes of turbulence dissipation: (1) "Viscous"-the turbulence cascade is Compton-damped on a scale l(damp) greater than the photon mean free path l(star). Then turbulence energy is passed to photons via bulk Comptonization by smooth shear flows on scale l(star) < l(damp). (2) "Collisionless"-the cascade avoids Compton damping and extends to microscopic plasma scales much smaller than l(star). The collisionless dissipation energizes plasma particles, which radiate the received energy; how the dissipated power is partitioned between particles needs further investigation with kinetic simulations. We show that the dissipation regime switches from viscous to collisionless during the jet expansion, at a critical value of the jet optical depth, which depends on the amplitude of turbulence. Turbulent GRB jets are expected to emit nonthermal photospheric radiation. Our analysis also suggests revisions of turbulent Comptonization in black hole accretion disks discussed in previous works.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2019. Vol. 885, no 1, article id 30
Keywords [en]
gamma-ray burst: general, hydrodynamics, plasmas, radiation mechanisms: non-thermal, turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-265494DOI: 10.3847/1538-4357/ab364bISI: 000498556900015Scopus ID: 2-s2.0-85075243684OAI: oai:DiVA.org:kth-265494DiVA, id: diva2:1379723
Note

QC 20191217

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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Lundman, Christoffer

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