X-ray constraints on the spectral energy distribution of the $z=5.18$ blazar SDSS J013127.34-032100.1

Hongjun An; Roger W. Romani

doi:10.3847/1538-4357/abbb91

paper

X-ray constraints on the spectral energy distribution of the $z = 5.18$ blazar SDSS J013127.34-032100.1

arXiv:2009.11450 · doi:10.3847/1538-4357/abbb91

Abstract

We report on X-ray measurements constraining the spectral energy distribution (SED) of the high-redshift $z = 5.18$ blazar SDSS J013127.34 $-$ 032100.1 with new XMM-Newton and NuSTAR exposures. The blazar's X-ray spectrum is well fit by a power law with $Γ = 1.9$ and $N_{H} = 1.1 \times 1 0^{21} c m^{- 2}$ , or a broken power law with $Γ_{l} = 0.5$ , $Γ_{h} = 1.8$ , and a break energy $E_{b} = 0.7$ keV for an expected absorbing column density of $N_{H} = 3.6 \times 1 0^{20} c m^{- 2}$ , supported by spectral fitting of a nearby bright source. No additional spectral break is found at higher X-ray energies (1-30 keV). We supplement the X-ray data with lower-energy radio-to-optical measurements and Fermi-LAT gamma-ray upper limits, construct broadband SEDs of the source, and model the SEDs using a synchro-Compton scenario. This modeling constrains the bulk Doppler factor of the jets to $\geq$ 7 and $\geq$ 6 (90%) for the low- and high- $N_{H}$ SEDs, respectively. The corresponding beaming implies $\geq$ 130 (low $N_{H}$ ) or $\geq$ 100 (high $N_{H}$ ) high-spin supermassive black holes similar to J0131 exist at similar redshifts.

arXiv comment10 pages, 5 figures, accepted for publication in ApJ

X-ray constraints on the spectral energy distribution of the $z = 5.18$ blazar SDSS J013127.34-032100.1

Abstract

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X-ray constraints on the spectral energy distribution of the z=5.18 blazar SDSS J013127.34-032100.1

Abstract

References in corpus (24)

Cited by in corpus (4)

X-ray constraints on the spectral energy distribution of the $z = 5.18$ blazar SDSS J013127.34-032100.1