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last updated: 09/25/23

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Astrophysics Updates on arXiv.org
last updated: 03/13/26
15 cMpc bubbles increases by 219% at z = 14; for the EOS bright galaxies model, the above number increases by 832% under the same circumstances. Above all, lensing introduces unavoidable systematics for BSD, which must be carefully taken into account for relevant studies in the Square Kilometre Array (SKA) era.' class='itmHover'>Gravitational Lensing Effects by Galaxy Clusters on Ionised Bubble Size Distribution during the Epoch of Reionisation
1$. We constrain the high-energy cutoff and coronal temperature at 90\% confidence level for 10 and 9 sources, respectively. The sample exhibits a mean cutoff energy of $E_{\rm cut}=80.8\pm8.1$ keV and a mean coronal temperature of $kT_{\rm e}=18.4\pm1.6$ keV, both significantly lower than those measured in local {\it Swift}-BAT AGN, while the mean optical depth ($\tau=4.8\pm0.3$) is significantly higher. The uncertainties are at 1~$\sigma$. Combining our high-redshift sample with local AGN, we find a potential anti-correlation between cutoff energy and both X-ray luminosity and black hole mass, with no significant dependence on Eddington ratio. Within a hybrid coronal framework, the inferred temperatures lie well below the pair-production limits for purely thermal coronae, indicating a substantial efficient Compton cooling and/or non-thermal electron component. The detection of low coronal temperatures in high-luminosity AGN is broadly consistent with predictions from recent radiation MHD simulations that consider purely thermal electron populations, implying that non-thermal electrons may not be the primary drivers of the observed coronal properties in these systems.' class='itmHover'>PACHA: Probing AGN Coronae with High-redshift AGN
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last updated: 09/25/23

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