Matches in SemOpenAlex for { <https://semopenalex.org/work/W3104351461> ?p ?o ?g. }
- W3104351461 endingPage "240" @default.
- W3104351461 startingPage "240" @default.
- W3104351461 abstract "As matter accretes onto the central supermassive black holes in active galactic nuclei (AGN), X-rays are emitted. We present a population synthesis model that accounts for the summed X-ray emission from growing black holes; modulo the efficiency of converting mass to X-rays, this is effectively a record of the accreted mass. We need this population synthesis model to reproduce observed constraints from X-ray surveys: the X-ray number counts, the observed fraction of Compton-thick AGN [$log$ (N$_{rm H}$/cm$^{rm -2}$) $>$ 24] and the spectrum of the cosmic X-ray background (CXB), after accounting for selection biases. Over the past decade, X-ray surveys by {it XMM-Newton}, {it Chandra}, textit{NuSTAR} and textit{Swift}-BAT have provided greatly improved observational constraints. We find that no existing X-ray luminosity function (XLF) consistently reproduces all these observations. We take the uncertainty in AGN spectra into account, and use a neural network to compute an XLF that fits all observed constraints, including observed Compton-thick number counts and fractions. This new population synthesis model suggests that, intrinsically, 50$pm$9% (56$pm$7%) of all AGN within z $simeq$ 0.1 (1.0) are Compton-thick." @default.
- W3104351461 created "2020-11-23" @default.
- W3104351461 creator A5006269247 @default.
- W3104351461 creator A5015361974 @default.
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- W3104351461 creator A5070191530 @default.
- W3104351461 creator A5071161265 @default.
- W3104351461 creator A5079038271 @default.
- W3104351461 date "2019-02-05" @default.
- W3104351461 modified "2023-10-10" @default.
- W3104351461 title "The Accretion History of AGNs. I. Supermassive Black Hole Population Synthesis Model" @default.
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