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Magnetized Advective Accretion Disks and Jets: Harmpi Simulation

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Abstract

An optically thin advective accretion disk appears to be indispensable to explain hard-state of black hole sources. Any transport of matter therein is assumed to be led by (modified) \(\alpha \)-viscosity when the magnetic field is weak. We explore how large scale stronger magnetic field helps in transporting angular momentum in disk and outflow/jet, depending on the field geometry and plasma-\(\beta \) parameter, basically by underlying magnetic shear over \(\alpha \)-viscosity. Interestingly, while above a critical accretion rate the accretion disk turns out to be thermally unstable, in the presence of stronger magnetic fields the disk regains its stability. In the present work, we establish this by numerical simulation based on HARMPI, while the underlying theory was established by one of us earlier. This magnetically arrested advective accretion disk (MA-AAF) in the optically thin regime has far reaching implications including the explanation of ultra-luminous X-ray sources.

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Funding

BM thanks SERB, India, with Ref. no. CRG/2022/003460, for partial support towards this research.

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Authors and Affiliations

  1. Indian Institute of Science, Bengaluru, India

    Rohan Raha, Banibrata Mukhopadhyay & S. M. Gopika

  2. Black Hole Initiative at Harvard University, Cambridge, USA

    Koushik Chatterjee

  3. Indian Institute of Science Education and Research, Kolkata, West Bengal, India

    S. M. Gopika

Authors
  1. Rohan Raha
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  2. Banibrata Mukhopadhyay
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  3. Koushik Chatterjee
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  4. S. M. Gopika
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Corresponding authors

Correspondence to Rohan Raha, Banibrata Mukhopadhyay, Koushik Chatterjee or S. M. Gopika.

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Paper presented at the Fifth Zeldovich meeting, an international conference in honor of Ya.B. Zeldovich held in Yerevan, Armenia on June 12–16, 2023. Published by the recommendation of the special editors: R. Ruffini, N. Sahakyan and G.V. Vereshchagin.

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Raha, R., Mukhopadhyay, B., Chatterjee, K. et al. Magnetized Advective Accretion Disks and Jets: Harmpi Simulation. Astron. Rep. 67 (Suppl 2), S189–S198 (2023). https://doi.org/10.1134/S1063772923140172

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  • DOI: https://doi.org/10.1134/S1063772923140172

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