Verification of Cas A neutron star cooling rate using Chandra HRC-S observations

[2508.15161] Verification of Cas A neutron star cooling rate using Chandra HRC-S observations Skip to main content We gratefully acknowledge support from the Simons Foundation, member institutions , and all contributors.
Here, we test the cooling of the Cas A NS with Chandra HRC data over 25 years.
Assuming a fixed hydrogen column density ($N_{\rm H}$), we infer the cooling rate of the Cas A NS to be 0.57$^{+0.26}_{-0.27}$% per decade.
Allowing the $N_{\rm H}$ to vary with time (as estimated using ACIS data), the cooling rate is 1.11$^{+0.25}_{-0.28}$% per decade.
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