Relativistic jets from collapsars

M. A. Aloy, E. Müller, J. Ma Ibáñez, J. Ma Martí, A. Macfadyen

    Research output: Contribution to journalArticle

    Abstract

    Using a collapsar progenitor model of MacFadyen & Woosley, we have simulated the propagation of an axisymmetric jet through a collapsing rotating massive star with the GENESIS multidimensional relativistic hydrodynamic code. The jet forms as a consequence of an assumed (constant or variable) energy deposition in the range of 1050-1051 ergs s-1 within a 30° cone around the rotation axis. The jet flow is strongly beamed (approximately less than a few degrees), spatially inhomogene ous, and time dependent. The jet reaches the surface of the stellar progenitor (R* = 2.98 × 1010 cm) intact. At breakout, the maximum Lorentz factor of the jet flow is 33. After breakout, the jet accelerates into the circumstellar medium, whose density is assumed to decrease exponentially and then become constant, ρext = 10-5 g cm-3. Outside the star, the flow begins to expand laterally also (v ~ c), but the beam remains very well collimated. At a distance of 2.54 R*, where the simulation ends, the Lorentz factor has increased to 44.

    Original languageEnglish (US)
    JournalAstrophysical Journal
    Volume531
    Issue number2 PART 2
    StatePublished - Mar 10 2000

    Fingerprint

    jet flow
    massive stars
    erg
    cones
    hydrodynamics
    stars
    propagation
    simulation
    energy
    code

    Keywords

    • Gamma rays: Bursts
    • Gamma rays: Theory
    • Hydrodynamics
    • Methods: Numerical
    • Relativity

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Aloy, M. A., Müller, E., Ibáñez, J. M., Martí, J. M., & Macfadyen, A. (2000). Relativistic jets from collapsars. Astrophysical Journal, 531(2 PART 2).

    Relativistic jets from collapsars. / Aloy, M. A.; Müller, E.; Ibáñez, J. Ma; Martí, J. Ma; Macfadyen, A.

    In: Astrophysical Journal, Vol. 531, No. 2 PART 2, 10.03.2000.

    Research output: Contribution to journalArticle

    Aloy, MA, Müller, E, Ibáñez, JM, Martí, JM & Macfadyen, A 2000, 'Relativistic jets from collapsars', Astrophysical Journal, vol. 531, no. 2 PART 2.
    Aloy MA, Müller E, Ibáñez JM, Martí JM, Macfadyen A. Relativistic jets from collapsars. Astrophysical Journal. 2000 Mar 10;531(2 PART 2).
    Aloy, M. A. ; Müller, E. ; Ibáñez, J. Ma ; Martí, J. Ma ; Macfadyen, A. / Relativistic jets from collapsars. In: Astrophysical Journal. 2000 ; Vol. 531, No. 2 PART 2.
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    KW - Methods: Numerical

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