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Browsing Physics by Author "Abid Hussain"

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    Galactic transonic winds with cosmic rays and waves
    (UMT, Lahore, 2024) Abid Hussain
    Cosmic rays are energetic charged particles and their transport plays an important role in the feedback processes in the interstellar and intergalactic medium. Cosmic rays couple to plasma via hydromagnetic waves which could in turn be excited by cosmic ray streaming instability. Cosmic rays and waves can modify the plasma flow via their pressure gradient. We are interested in cosmic ray-driven galactic winds. Our system comprises thermal plasma, cosmic rays, and one forward propagating self-excited Alfvén-wave. Possible steady flow solutions in divergent flux-tube formulations are presented. Understanding the behaviour of sonic points in astrophysical accretion flows is crucial to understand. In this study, we employ a sophisticated three-fluid model implemented in MATLAB to investigate the impact of mass flux variations on sonic points under the galactic potential well. Our analytical results incorporate thermal plasma, cosmic rays, and Alfvén-wave pressure components, allowing for a comprehensive examination of the stability of the sonic point near the base of the potential well. By systematically varying mass flux parameters, we elucidate the intricate interplay between different pressure sources and mass accretion rates, shedding light on fundamental aspects of accretion disk dynamics. Our findings offer valuable insights into the mechanisms governing energy release, outflow generation, and observational signatures of astrophysical accretion phenomena. This study highlights the utility of analytical results with a three-fluid model in MATLAB for advancing our understanding of accretion processes in extreme astrophysical environments.