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Dynamics of Colliding Winds in Pulsar Binary Systems: A Study of PSR 1259-63 and LS 5039

This research delves into the complex dynamics of colliding winds in pulsar binaries, with a focus on PSR 1259-63/SS2883 and LS 5039. By employing numerical modeling, the study investigates the interaction between relativistic and nonrelativistic winds, the positioning of shocks, and the evolution of jets formed in the post-shock region. Key findings reveal the conditions under which shock fronts remain open or closed and how adiabatic cooling influences radiation characteristics. The results carry implications for the understanding of energy flow dynamics within pulsar wind systems.

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Dynamics of Colliding Winds in Pulsar Binary Systems: A Study of PSR 1259-63 and LS 5039

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  1. Colliding winds in pulsar binaries S.V.Bogovalov1, A.V.Koldoba2,G.V.Ustugova2, D. Khangulyan3, F.Aharonian3 1-National Nuclear Research University (Moscow) 2-Institute of applied mathematics RAN (Moscow) 3-Max-Planck-Institute for Nuclear Physics (Heidelberg)

  2. Candidates • PSR 1259-63/2883 • LS 5039 • LSI +61303 • Cygnus X-1

  3. System PSR1259-63/SS2883 • Companion star Pulsar M ~ 10 Solar mass P=47.7 ms L ~ 3.3 1037 erg/s Lsd=8.3 1035 erg/s T ~ 2.3 104 K Stellar outflow Binary system • Polar wind Distance d =1.5 kpc Vp ~ 2000 km/s e=0.87 Mp ~2 10-8 Solar mass/yr Periastron separation Equatorial outflow Dmin=9.6 1012 cm Vd ~ 150-300 km/s Md ~ 5 10-8 Solar mass/yr

  4. View on the system

  5. Parameterization Separation distance D=1. At Lorentz factor γ >> 1 All the flow depends on the only parameter For PSR 1259-63 10-2 <η<1

  6. The scheme of interaction of the winds

  7. Basic problems at the numerical modeling • The position of the shocks and discontinues is unknown a priory • Large difference in equations and properties of the relativistic and nonrelativistic flows • Different Courant numbers in relativistic and nonrelativistic flows. • Instability of the contact discontinuity.

  8. Two zone solution • Nearest zone includes all the regions of subsonic flows- Method of relaxation • Far zone – supersonic flow. Cauchy problem.

  9. Method of solution in the nearest zone • The equations are solved only in the post shock regions • Adaptive mesh is used. Beams are fixed, position of fronts vary

  10. Equations for the relativistic wind

  11. Equations for the nonrelativistic winds

  12. Dynamics of the discontinuities To define evolution of the shocks and Contact discontinuity The Reimann problem About discontinuity decay Has been solved

  13. The method of solution In the far zone

  14. Results • The termination shock front of the pulsar wind is not always closed. For η > 1.25 10-2 the shock front is opened.

  15. The shock front for plane parallel stellar wind

  16. High η

  17. Dependence of the fronts on η

  18. Dependance of the asymptotic opening angle of the fronts on η

  19. Energy flow in the relativistic post shock wind Total energy along flow line is conserved

  20. Adiabatic cooling

  21. Formation of relativistic jet-like flows in the post shock wind

  22. The role of the magnetic field

  23. For comparison - interaction of the magnetized isotropic pulsar wind with isotropic interstellar medium

  24. Basic conclusions • relativistic wind in the post shock region becomes relativistic even at the distance comparable with the separation distance. • At higher distances the Lorentz factor can achieve initial values • Even moderate relativistic motion of the post shock plasma can have strong impact on the light curve of radiation (synchrotron and IC) • Adiabatic cooling can result into suppression of the synchrotron radiation and excess of IC radiation.

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