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- W4214897445 abstract "Although observations of high-redshift quasars demonstrate that many supermassive black holes (BHs) reached large masses within one billion years after the Big Bang, the origin of the first BHs is still a mystery. A promising way to constrain the origin of the first BHs is to explore the average properties of $zgtrsim6$ BHs. However, typical BHs remain hidden from X-ray surveys, which is due to their relatively faint nature and the limited sensitivity of X-ray telescopes. Gravitational lensing provides an attractive way to study this unique galaxy population as it magnifies the faint light from these high-redshift galaxies. Here, we study the X-ray emission originating from 155 gravitationally-lensed $zgtrsim6$ galaxies that were detected in the RELICS survey. We utilize Chandra X-ray observations to search for AGN in the individual galaxies and in the stacked galaxy samples. We did not identify an individual X-ray source that was undoubtedly associated with a high-redshift galaxy. We stack the signal from all galaxies and do not find a statistically significant detection. We split our sample based on stellar mass, star-formation rate, and lensing magnification and stack these sub-samples. We obtain a $2.2sigma$ detection for massive galaxies with an X-ray luminosity of $(3.7pm1.6)times10^{42} rm{erg s^{-1}}$, which corresponds to a $(3.0pm1.3)times10^5 rm{M_{odot}}$ BH accreting at its Eddington rate. Other stacks remain undetected and we place upper limits on the AGN emission. These limits imply that the bulk of BHs at $zgtrsim6$ either accrete at a few percent of their Eddington rate and/or are $1-2$ orders of magnitude less massive than expected based on the stellar mass of their host galaxy." @default.
- W4214897445 created "2022-03-05" @default.
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- W4214897445 date "2022-03-01" @default.
- W4214897445 modified "2023-09-25" @default.
- W4214897445 title "Exploring Gravitationally Lensed z ≳ 6 X-Ray Active Galactic Nuclei Behind the RELICS Clusters" @default.
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- W4214897445 doi "https://doi.org/10.3847/1538-4357/ac4ae5" @default.
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