Cosmic-ray production from neutron escape in microquasar jets

The origin of Galactic cosmic rays remains a matter debate, but supernova remnants are commonly considered to be the main place where high-energy accelerated. Nevertheless, current models predict cosmic-ray spectra that do not match observations and efficiency acceleration mechanism is still undetermined. On other hand, contribution kinds sources population unclear, merits investigation. In this work we explore novel through which microquasars might produce rays. scenario, microquasar jets generate relativistic neutrons, escape decay outside system; protons electrons, created when these neutrons decay, interstellar medium as most promising scenarios arise in extremely luminous systems ($L_\mathrm{jet} \sim 10^{40}\,\mathrm{erg \, s}^{-1}$), fraction jet power deposited can reach $\sim 0.001$. Slow ($\Gamma \lesssim 2$, $\Gamma$ bulk Lorentz factor) favour neutron production. resulting spectrum similar for share ratio given by decay. peaks at roughly half minimum energy jet; it soft (spectral index 3$) above energy, almost flat below. Values spectral steeper than $2$ possible our model indeed agree with those required explain signatures rays, although only extreme provide comparable typical remnant. explored may stronger softer early Universe, therefore contribute heating reionisation intergalactic medium.