Cosmological zoom-in simulations find that grain-grain shattering in diffuse ISM gas drives rising PAH mass fraction with time, naturally producing the observed PAH-metallicity relation and inverse qPAH-molecular gas trends.
J., Mathiesen, B., & Evrard, A
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Shock-to-shock distances in double radio relic clusters serve as a merger chronometer to set a 68% upper limit of sigma/m < 0.22 cm²/g on dark matter self-interaction, marginalizing over mass, angle, speed, phase, impact parameter, and gas slope.
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A New Robust Constraint on the Self-interaction Cross-section of Dark Matter with Double Radio Relic Clusters
Shock-to-shock distances in double radio relic clusters serve as a merger chronometer to set a 68% upper limit of sigma/m < 0.22 cm²/g on dark matter self-interaction, marginalizing over mass, angle, speed, phase, impact parameter, and gas slope.