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@ARTICLE{Marcotulli:453874,
      author       = {Marcotulli, L. and Paliya, Vaidehi Sharan and Ajello, M.
                      and Kaur, A. and Marchesi, S. and Rajagopal, M. and
                      Hartmann, D. and Gasparrini, D. and Ojha, R. and Madejski,
                      G.},
      title        = {{N}u{STAR} perspective on high-redshift {M}e{V} blazars},
      journal      = {The astrophysical journal / 2},
      volume       = {889},
      number       = {2},
      issn         = {1538-4357},
      address      = {Chicago, Ill. [u.a.]},
      publisher    = {Univ.11032},
      reportid     = {PUBDB-2021-00238, arXiv:2001.01956},
      pages        = {164},
      year         = {2020},
      note         = {17 pages, 7 figures, 8 tables, 1 appendix, accepted for
                      publication in ApJ},
      abstract     = {With bolometric luminosities exceeding $10^{48}$ erg
                      s$^{-1}$, powerful jets and supermassive black holes at
                      their center, MeV blazars are some of the most extreme
                      sources in the Universe. Recently, the Fermi-Large Area
                      Telescope detected five new $\gamma$-ray emitting MeV
                      blazars beyond redshift $z=3.1$. With the goal of precisely
                      characterizing the jet properties of these extreme sources,
                      we started a multiwavelength campaign to follow them up with
                      joint NuSTAR, Swift and SARA observations. We observe six
                      high-redshift quasars, four of them belonging to the new
                      $\gamma$-ray emitting MeV blazars. Thorough X-ray analysis
                      reveals spectral flattening at soft X-ray for three of these
                      objects. The source NVSS J151002$+$570243 also shows a
                      peculiar re-hardening of the X-ray spectrum at energies
                      $E>6\,\rm keV$. Adopting a one-zone leptonic emission model,
                      this combination of hard X-rays and $\gamma$-rays enables us
                      to determine the location of the Inverse Compton peak and to
                      accurately constrain the jet characteristics. In the context
                      of the jet-accretion disk connection, we find that all six
                      sources have jet powers exceeding accretion disk luminosity,
                      seemingly validating this positive correlation even beyond
                      $z>3$. Our six sources are found to have $10^9 \rm
                      M_{\odot}$ black holes, further raising the space density of
                      supermassive black holes in the redshift bin $z=[3,4]$.},
      cin          = {ZEU-EXP/AT},
      ddc          = {520},
      cid          = {$I:(DE-H253)ZEU-EXP_AT-20120731$},
      pnm          = {613 - Matter and Radiation from the Universe (POF3-613)},
      pid          = {G:(DE-HGF)POF3-613},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2001.01956},
      howpublished = {arXiv:2001.01956},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2001.01956;\%\%$},
      UT           = {WOS:000537753200002},
      doi          = {10.3847/1538-4357/ab65f5},
      url          = {https://bib-pubdb1.desy.de/record/453874},
}