20 May 2019
Institut d'Astrophysique de Paris
Europe/Paris timezone

The formation of BH-HMXBs and BBHs: Impact in Gravitationl Waves Astrophysics and Cosmology

20 May 2019, 15:00
Amphithéâtre (Institut d'Astrophysique de Paris)


Institut d'Astrophysique de Paris

98bis boulevard Arago, 75014 Paris
Board: 5


Felix Mirabel (CEA)


Theoretical models and observations suggest that primordial Stellar Black Holes (Pop-III-BHs) were prolifically formed in HMXBs, which are powerful relativistic jet sources of synchrotron radiation called Microquasars (MQs). Large populations of BH-HMXB-MQs at cosmic dawn produce a smooth synchrotron cosmic radio background (CRB) that could account for the possible excess amplitude of atomic hydrogen absorption at z~17, recently reported by EDGES. BH-HMXB-MQs at cosmic dawn precede supernovae, neutron stars and dust. BH-HMXB-MQs promptly inject hard X-rays and relativistic jets into the IGM, which overtake the slower expanding HII regions ionized by progenitor Pop-III stars, heating and partially ionizing the IGM over larger distance scales. BH-HMXBs are channels for the formation of Binary-Black-Holes (BBHs). The large masses of BBHs detected by gravitational waves, relative to the masses of BHs detected by X-rays, and the high rates of BBH-mergers, are consistent with high formation rates of BH-HMXBs and BBHs in the early universe.

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