Journal Article

PUBDB-2021-00238

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png NuSTAR perspective on high-redshift MeV blazars

Marcotulli, L. (Corresponding author) ; Paliya, V. S. (Corresponding author)DESY* ; Ajello, M. ; Kaur, A. ; Marchesi, S. ; Rajagopal, M. ; Hartmann, D. ; Gasparrini, D. ; Ojha, R. ; Madejski, G.

2020
Univ.11032 Chicago, Ill. [u.a.]

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Please use a persistent id in citations: doi:10.3847/1538-4357/ab65f5  doi:10.3204/PUBDB-2021-00238

Report No.: arXiv:2001.01956

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 $z=[3,4]$.

Note: 17 pages, 7 figures, 8 tables, 1 appendix, accepted for publication in ApJ

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Contributing Institute(s):

1. Astroteilchenphysik (ZEU-EXP/AT)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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