{
  "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 semianalytic trans-magnetosonic shock solutions, we estimate the kinetic energy available in the downstream postshock flow and compare it with the 25 yr Chandra X-ray flare catalog. For each theoretical solution, we compute the required efficiency ϵ = E data / E sh , where E data is the observed radiated energy for each flare and E sh is the available energy in the shocked flow. Notably, the weak flares require ϵ ∼ 10 ⁻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 an additional magnetic energy dissipation channel.",
  "abstract_shown": true,
  "affiliations": [
    "Tata Institute of Fundamental Research",
    "Center for Theoretical Physics",
    "Masaryk University",
    "McGill University",
    "3550 Rue University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "affs": [
        0,
        1,
        2
      ],
      "name": "Samik Mitra",
      "orcid": "0000-0002-5730-0376"
    },
    {
      "affs": [
        1
      ],
      "name": "Bożena Czerny",
      "orcid": "0000-0001-5848-4333"
    },
    {
      "affs": [
        2
      ],
      "name": "Michal Zajaček",
      "orcid": "0000-0001-6450-1187"
    },
    {
      "affs": [
        3,
        4
      ],
      "name": "Zach Sumners",
      "orcid": "0009-0004-8539-3516"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7332fdveb8543.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/aea3f2",
  "fulltext_url": null,
  "id": "7332fdveb8543",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea3f2",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7221866336",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea3f2/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/7332fdveb8543.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/aea3f2",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/aea3f2"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "journal-openalex:3103|Stellar, planetary, and galactic studies",
      "subfield": "stellar"
    }
  ],
  "title": "Low-angular-momentum Accretion Shocks Can Power Weak-to-moderate X-Ray Flares from Sgr A*",
  "title_text": "Low-angular-momentum Accretion Shocks Can Power Weak-to-moderate X-Ray Flares from Sgr A*",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/7332fdveb8543",
  "venue": "The Astrophysical Journal",
  "versions": []
}