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May 17, 2026

X-ray-luminous late-type giants: An overlooked population contributing to the Galactic ridge iron line emission

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Authors

TBTong BaoGPGabriele PontiXXXiaojie Xu

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Overview

Randomized trial identifies contributions of late-type giants to Galactic X-ray background, implying significant implications for astrophysics.

Key Points

  • This study aims to identify and characterize hard X-ray sources related to late-type giants in the Galactic X-ray background.
  • Cross-correlated X-ray sources with Gaia counterparts in the inner Galactic disk heritage survey
  • Analyzed X-ray spectra focusing on highly ionized iron emission lines
  • Selected sources based on hard X-ray emission within the red giant branch of the color-magnitude diagram.
  • Identified 107 X-ray sources associated with the long-period variable population
  • Exhibited high X-ray luminosities ranging from 10^31 to 10^33 erg/s
  • Contributed approximately 20% to the total Galactic ridge X-ray emission continuum and 40% of its iron line emission.

Cite This Study

Bao et al. (2026) studied this question.

synapsesocial.com/papers/6a095bdd7880e6d24efe1c70https://doi.org/10.1051/0004-6361/202660001/pdf
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