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High-redshift Blazars through NuSTAR eyes

Journal Article · · The Astrophysical Journal (Online)
The most powerful sources among the blazar family are MeV blazars. Often detected at z > 2, they usually display high X- and γ-ray luminosities, larger-than-average jet powers, and black hole masses ≳109 M. In the present work, we perform a multiwavelength study of three high-redshift blazars: 3FGL J0325.5+2223 (z = 2.06), 3FGL J0449.0+1121 (z = 2.15), and 3FGL J0453.2–2808 (z = 2.56), analyzing quasi-simultaneous data from GROND, Swift-UVOT and XRT, Nuclear Spectroscopic Telescope Array (NuSTAR), and Fermi-LAT. Our main focus is on the hard X-ray band recently unveiled by NuSTAR (3–79 keV) where these objects show a hard spectrum that enables us to constrain the inverse Compton (IC) peak and the jet power. We found that all three targets resemble the most powerful blazars, with the synchrotron peak located in the submillimeter range and the IC peak in the MeV range, and therefore belong to the MeV blazar class. Using a simple one-zone leptonic emission model to reproduce the spectral energy distributions, we conclude that a simple combination of synchrotron and accretion disk emission reproduces the infrared–optical spectra, while the X-ray to γ-ray part is well reproduced by the IC scattering of low-energy photons supplied by the broad-line region. The black hole masses for each of the three sources are calculated to be ≳4 × 108 M. Finally, the three studied sources have jet power at the level of, or beyond, the accretion luminosity.
Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1355729
Alternate ID(s):
OSTI ID: 22663689
Journal Information:
The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 839; ISSN 1538-4357
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Blazar spectral variability as explained by a twisted inhomogeneous jet journal December 2017
Re-awakening of GRS 1716–249 after 23 yr, observed by Swift/XRT and NuSTAR journal June 2019
Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR journal June 2019
NuSTAR perspective on high-redshift MeV blazars text January 2020
Detection of a Gamma-Ray Flare from the High-redshift Blazar DA 193 journal February 2019
NuSTAR Perspective on High-redshift MeV Blazars journal February 2020
Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR text January 2019

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