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Black holes During the Cosmic Dawn

8 Nov 2018, 17:00 UTC
Black holes During the Cosmic Dawn
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Title: Observing the influence of growing black holes on the pre-reionization IGMAuthors: Evgenii Vasiliev, Shiv Sethi, & Yuri ShchekinovFirst Author’s Institution: Southern Federal University, Rostov, RussiaStatus: Submitted to ApJ, open access
Cosmologically important phenomena are typically discussed on the scales of gigaparsecs (Gpc); to give you some idea of the sizes involved, one Gpc could fit approximately 33 thousand Milky Way galaxies end-to-end. That’s a pretty crazy scale and with that in mind today we’ll gain an understanding for how astrophysical events beginning on the order of parsecs can have far-reaching affects cosmologically.
Cosmic Dawn and ReionizationThe cosmological period prior to the reionization of the Universe’s hydrogen is typically described as being the cosmic dawn. This stage in the history of the Universe is marked by the formation of the first stars and galaxies. But it doesn’t end there, connecting these large structures throughout the Universe is the Intergalactic Medium (IGM). The IGM during the cosmic dawn consists of mostly neutral hydrogen, and compared to galaxies, is much less dense (10^-27 compared to the density of our Milky Way which is ~10^-19 ). The UV radiation from these early stars and galaxies are what most astronomers and cosmologists ...

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