Two RELHIC candidates in FAST observations
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The discovery of two “dark” HI clouds (Cloud N and S) identified during the FEASTS survey, located approximately 70–90 kpc from the center of the M51 galaxy. These clouds are strong candidates for RELHICs (REionization-Limited H I Clouds)—starless, gas-rich dark matter halos limited by cosmic reionization. These findings provide significant observational evidence for the existence of primitive, starless dark matter halos in the local universe