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http://hdl.handle.net/20.500.12386/31199
Titolo: | NuSTAR Perspective on High-redshift MeV Blazars | Autori: | Marcotulli, L Paliya, V Ajello, M Kaur, A MARCHESI, STEFANO Rajagopal, M Hartmann, D Gasparrini, D Ojha, R Madejski, G |
Data pubblicazione: | 2020 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 889 | Fascicolo: | 2 | Da pagina:: | 164 | Abstract: | With bolometric luminosities exceeding 1048 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 γ-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 Nuclear Spectroscopic Telescope Array, Swift, and the Southeastern Association for Research in Astronomy's optical telescopes. We observe six high-redshift quasars, four of them belonging to the new γ-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 rehardening of the X-ray spectrum at energies E > 6 keV. Adopting a one-zone leptonic emission model, this combination of hard X-rays and γ-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 black holes, further raising the space density of supermassive black holes in the redshift bin z = [3, 4]. | URI: | http://hdl.handle.net/20.500.12386/31199 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/ab65f5 https://api.elsevier.com/content/abstract/scopus_id/85081396537 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/ab65f5 | Bibcode ADS: | 2020ApJ...889..164M | Fulltext: | open |
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