SIMBAD references

2020ApJ...889..164M - Astrophys. J., 889, 164-164 (2020/February-1)

NuSTAR perspective on high-redshift MeV blazars.

MARCOTULLI L., PALIYA V., AJELLO M., KAUR A., MARCHESI S., RAJAGOPAL M., HARTMANN D., GASPARRINI D., OJHA R. and MADEJSKI G.

Abstract (from CDS):

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 109M black holes, further raising the space density of supermassive black holes in the redshift bin z = [3, 4].

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Active galactic nuclei - Blazars - High energy astrophysics - Jets

Simbad objects: 6

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2020ApJ...889..164M and select 'bookmark this link' or equivalent in the popup menu