Searching for Primordial Black Holes in the radio and X-ray sky

Creators: Gaggero, Daniele; Bertone, Gianfranco; Calore, Francesca; Connors, Riley M. T.; Lovell, Mark; Markoff, Sera; Storm, Emma

Abstract

We model the accretion of gas onto a population of massive primordial black holes in the Milky Way and compare the predicted radio and x-ray emission with observational data. We show that, under conservative assumptions on the accretion process, the possibility that O(10)M⊙ primordial black holes can account for all of the dark matter in the Milky Way is excluded at 5σ by a comparison with a Very Large Array radio catalog at 1.4 GHz and at ≃40σ by a comparison with a Chandra x-ray catalog (0.5–8 keV). We argue that this method can be used to identify such a population of primordial black holes with more sensitive future radio and x-ray surveys.

Additional Information

© 2017 American Physical Society. Received 9 December 2016; revised manuscript received 12 May 2017; published 12 June 2017. We are indebted to M. Fornasa for verifying of the phase-space velocity at low radii with the Eddington formalism. We thank P. D. Serpico for his useful comments on the manuscript and D. Baumann, P. Crumley, B. Freivogel, A. King, A. Urbano, J. Vink, and C. Weniger for useful discussions. Finally, we thank the anonymous reviewers for their insightful comments and suggestions. R. C. is supported by the Netherlands Research School for Astronomy (NOVA). S. M. acknowledges support from the Netherlands Organization for Scientific Research (NWO) VICI Grant No. 639.043.513. E. S. is supported by the Netherlands Organization for Scientific Research (NWO) through a Vidi grant (PI: C. Weniger).

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