Výsledky vyhledávání - "Siddhartha, Gupta"

Akademický článek

Electron Acceleration at Quasi-parallel Nonrelativistic Shocks: A 1D Kinetic Survey

Autor: Siddhartha Gupta, Damiano Caprioli, Anatoly Spitkovsky

Publikováno v: The Astrophysical Journal, Vol 976, Iss 1, p 10 (2024)

We present a survey of 1D kinetic particle-in-cell simulations of quasi-parallel nonrelativistic shocks to identify the environments favorable for electron acceleration. We explore an unprecedented range of shock speeds v _sh ≈ 0.067–0.267 c , Al

Externí odkaz: https://doaj.org/article/c035558e7f7043bf9cd97d8684ee7bbf

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Akademický článek

Return Currents in Collisionless Shocks

Autor: Siddhartha Gupta, Damiano Caprioli, Anatoly Spitkovsky

Publikováno v: The Astrophysical Journal, Vol 968, Iss 1, p 17 (2024)

Collisionless shocks tend to send charged particles into the upstream, driving electric currents through the plasma. Using kinetic particle-in-cell simulations, we investigate how the background thermal plasma neutralizes such currents in the upstrea

Externí odkaz: https://doaj.org/article/0c57768e42984792b3032a21e983faa5

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Akademický článek

Modeling the Saturation of the Bell Instability Using Hybrid Simulations

Autor: Georgios Zacharegkas, Damiano Caprioli, Colby Haggerty, Siddhartha Gupta, Benedikt Schroer

Publikováno v: The Astrophysical Journal, Vol 967, Iss 1, p 71 (2024)

The nonresonant streaming instability (Bell instability) plays a pivotal role in the acceleration and confinement of cosmic rays (CRs), yet the exact mechanism responsible for its saturation and the magnitude of the final amplified magnetic field hav

Externí odkaz: https://doaj.org/article/13ea2d3acd19425990ca3bafcd583c5b

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Akademický článek

Evidence for Multiple Shocks from the γ-Ray Emission of RS Ophiuchi

Autor: Rebecca Diesing, Brian D. Metzger, Elias Aydi, Laura Chomiuk, Indrek Vurm, Siddhartha Gupta, Damiano Caprioli

Publikováno v: The Astrophysical Journal, Vol 947, Iss 2, p 70 (2023)

In 2021 August, the Fermi Large Area Telescope, H.E.S.S., and MAGIC detected GeV and TeV γ -ray emission from an outburst of recurrent nova RS Ophiuchi. This detection represents the first very high-energy γ -rays observed from a nova, and it opens

Externí odkaz: https://doaj.org/article/6cb4f2bb14514445b0a317d3a543a36a

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Cosmic rays from massive star clusters: a close look at Westerlund 1

Autor: Siddhartha Gupta, Biman B. Nath, Sourav Bhadra, Prateek Sharma

Publikováno v: Monthly Notices of the Royal Astronomical Society. 510:5579-5591

We study the effect of cosmic ray (CR) acceleration in the massive compact star cluster Westerlund 1 in light of its recent detection in $\gamma$-rays. Recent observations reveal a $1/r$ radial distribution of the CR energy density. Here we theoretic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f98e5558d40130c0b953187bd55c11ba
https://doi.org/10.1093/mnras/stac023

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