NuSTAR Perspective on High-redshift MeV Blazars

Journal
Date Issued
2020
Author(s)
Marcotulli, L
•
Paliya, V
•
Ajello, M
•
Kaur, A
•
•
Rajagopal, M
•
Hartmann, D
•
Gasparrini, D
•
Ojha, R
•
Madejski, G
DOI
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].
Volume
889
Issue
2
Start page
164
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2020ApJ...889..164M
Rights
open.access
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