Journal
ASTROPHYSICAL JOURNAL
Volume 856, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/aab435
Keywords
quasars: individual (QSO J0906+6930); radiation mechanisms: non-thermal
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Funding
- DOE [DE-AC02-76SF00515]
- NASA [NNX17AC27G]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2017R1C1B2004566]
- National Research Foundation of Korea [2017R1C1B2004566] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- NASA [1003550, NNX17AC27G] Funding Source: Federal RePORTER
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We report on Gemini, NuSTAR, and eight years of Fermi observations of the most distant blazar QSO J0906+6930 (z = 5.48). We construct a broadband spectral energy distribution (SED) and model the SED using a synchroCompton model. The measurements yield a mass of similar to 4 x 10(9) M-circle dot for the black hole and a spectral break at similar to 4 keV in the combined fit of the new NuSTAR and archival Chandra data. The SED fitting constrains the bulk Doppler factor delta of the jet to 9(-3)(+2.5) for QSO J0906+6930. Similar, but weaker, constraints on d are derived from SED modeling of the three other claimed z > 5 blazars. Together, these extrapolate to similar to 620 similar sources, fully 20% of the optically bright, high-mass active galactic nuclei expected at 5 < z < 5.5. This has interesting implications for the early growth of massive black holes.
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