{
  "abstract": "Recent LHAASO observations indicate that microquasars and massive star clusters contribute to Galactic cosmic rays, and likely also to the pre-knee spectral hardening. Their markedly different astrophysical environments, compared with supernova remnants (SNRs), may imprint distinct cosmic-ray abundances. We investigate the spectra and composition of new-source cosmic rays under two abundance scenarios: Case-1, the SNR-like composition with enhanced heavy nuclei, and Case-2, the surface abundances of microquasar companion stars. We constrain injection spectral indices using LHAASO proton, helium, and all-particle spectra, and use their data for model discrimination. Under the assumption of a unified heavy-element injection spectrum, Case-2 fits the data significantly better than Case-1, but at the cost of large, physically unmotivated differences between heavy-element and He injection indices. This suggests the need to either relax the unified heavy-element injection-index assumption or explore alternative abundance patterns. We predict that if the new-source composition follows Case-1, the individual elemental spectral indices before the knee should remain nearly consistent; if it follows Case-2, the Mg, Si, and Fe spectra will be significantly softer than those of He, C, and O. Future element-resolved energy-spectrum measurements by HERD and LHAASO will provide a decisive test of this discriminating feature.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.20477",
  "author_total": 5,
  "authors": [
    {
      "name": "Xu-Lin Dong"
    },
    {
      "name": "Pei-Pei Zhang"
    },
    {
      "name": "Qi-Ling Chen"
    },
    {
      "name": "Shu-Wang Cui"
    },
    {
      "name": "Yi-Qing Guo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/czs18hb8k1q3z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.20477",
  "fulltext_url": null,
  "id": "czs18hb8k1q3z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.20477",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ],
    [
      "openalex",
      "3106|Astrophysics and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7222127764",
  "pdf_url": "https://arxiv.org/pdf/2610.20477",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/czs18hb8k1q3z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:15Z",
      "native_id": "2610.20477",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.20477"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "LHAASO Constraints on New-Source Cosmic Rays:Abundance Scenarios and Injection Spectral Indices",
  "title_text": "LHAASO Constraints on New-Source Cosmic Rays:Abundance Scenarios and Injection Spectral Indices",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:15Z",
  "url": "https://research.draconitic.com/paper/czs18hb8k1q3z",
  "venue": "arXiv",
  "versions": []
}