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Looking for X-ray AGN in Reionization-era quasar companion galaxies

Presentation #102.29 in the session AGN Posters.

Published onMay 03, 2024
Looking for X-ray AGN in Reionization-era quasar companion galaxies

Supermassive black holes observed in the first billion years of the Universe (z > 6) have continued to exceed expectations; the past decade has seen numerous billion Solar mass black holes discovered, even beyond redshift 7, requiring sustained, rapid growth, even from massive seeds. Yet, sub-mm studies of these titans has revealed something equally interesting — an overabundance of massive companion galaxies, often tens of kpc away or closer and with masses and star formation rates exceeding those of the quasar hosts! Yet these galaxies are not seen as quasars, implying that either they lack similar AGN despite their size or that something is shrouding the AGN emission. We undertook detailed studies of several of these sources with Chandra to search for signatures of X-ray emission, which we report upon here.

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