{
  "abstract": "X-ray flares from Sgr~A* span broad ranges in duration, fluence, and luminosity, but their origin remains unsettled. We test whether standing shocks in low-angular-momentum magnetized accretion flows can provide a viable energy reservoir to account for these events. Using semi-analytic trans-magnetosonic shock solutions, we estimate the kinetic energy available in the downstream post-shock flow and compare it with the 25-year \\textit{Chandra} X-ray flare catalog. For each theoretical solution, we compute the required efficiency $ε=E_{\\rm data}/E_{\\rm sh}$, where $E_{\\rm data}$ is the observed radiated energy for each flare and $E_{\\rm sh}$ is the available energy in the shocked flow. Notably, the weak flares require $ε\\sim10^{-3}$--$10^{-2}$, while moderate flares require a few percent. We perform the analyses for weakly and highly spinning cases, and the resulting weak-to-moderate flare energy budget remains unchanged. For the fiducial accretion rate and bolometric correction, the kinetic energy reservoir in standing shock is sufficient for the observed weak-to-moderate flare population, whereas the strongest events likely require higher efficiency which can be mediated via additional magnetic energy dissipation channel.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.04145",
  "author_total": 4,
  "authors": [
    {
      "name": "Samik Mitra"
    },
    {
      "name": "Bożena Czerny"
    },
    {
      "name": "Michal Zajaček"
    },
    {
      "name": "Zach Sumners"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/588xj3barvrj2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.04145",
  "fulltext_url": null,
  "id": "588xj3barvrj2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.04145",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7208788293",
  "pdf_url": "https://arxiv.org/pdf/2609.04145",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/588xj3barvrj2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:31Z",
      "native_id": "2609.04145",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.04145"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Low-angular-momentum accretion shocks can power weak-to-moderate X-ray flares from SgrA*",
  "title_text": "Low-angular-momentum accretion shocks can power weak-to-moderate X-ray flares from SgrA*",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:31Z",
  "url": "https://research.draconitic.com/paper/588xj3barvrj2",
  "venue": "arXiv",
  "versions": []
}