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Abstract: Anisotropic emission of gravitational waves during the merger or formation ofblack holes can lead to the ejection of these black holes from their hostgalaxies. A recoiled black hole which moves on an almost radial bound orbitoutside the virial radius of its central galaxy, in the cold dark matterbackground, reaches its apapsis in a finite time. The low value of dark mattervelocity dispersion at high redshifts and also the black hole velocity near theapapsis passage yield a high-density wake around these black holes. Gamma-rayemission can result from the enhancement of dark matter annihilation in thesewakes. The diffuse high-energy gamma-ray background from the ensemble of suchblack holes in the Hubble volume is also evaluated.



Autor: Roya Mohayaee, Jacques Colin

Fuente: https://arxiv.org/



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