SED Constraints on the Highest-z Blazar Jet: QSO J0906+6930

An, Hongjun; Romani, Roger W.

doi:10.3847/1538-4357/aab435

Title: SED Constraints on the Highest-z Blazar Jet: QSO J0906+6930

Journal Article · Thu Mar 29 00:00:00 EDT 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aab435· OSTI ID:1436086

^[1];

^[2]

Chungbuk National Univ., Cheongju (Republic of Korea)
Stanford Univ., Stanford, CA (United States)

Here, 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 synchro-Compton model. The measurements yield a mass of ~4 × 10⁹ M ⊙ for the black hole and a spectral break at ~4 keV in the combined fit of the new NuSTAR and archival Chandra data. The SED fitting constrains the bulk Doppler factor δ of the jet to 9^+2.5 _–3 for QSO J0906+6930. Similar, but weaker, constraints on δ are derived from SED modeling of the three other claimed z > 5 blazars. Together, these extrapolate 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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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1436086

Journal Information:: The Astrophysical Journal (Online), Vol. 856, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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Title: SED Constraints on the Highest-z Blazar Jet: QSO J0906+6930

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