High-redshift blazars through nustar eyes

Abstract

The most powerful sources among the blazar family are MeV blazars. Often detected at $z>2$, they usually display high X- and \gm-ray luminosities, larger-than-average jet powers and black hole masses $\gtrsim 10^9{M}_{\odot }$. In the present work we perform a multiwavelength study of three high redshift blazars: 3FGL J0325.5+2223 ($z=2.06$), 3FGL J0449.0+1121 ($z=2.15$), and 3FGL J0453.2$-$2808 ($z=2.56$), analysing quasi simultaneous data from GROND, \swift-UVOT and XRT, \nustar, and \fermi-LAT. Our main focus is on the hard X-ray band recently unveiled by \nustar~(3$-$79 keV) where these objects show a hard spectrum which enables us to constrain the inverse Compton peak and the jet power. We found that all three targets resemble the most powerful blazars, with the synchrotron peak located in the sub-millimeter range and the inverse Compton peak in the MeV range, and therefore belong to the MeV blazar class. Using a simple one zone leptonic emission model to reproduce the spectral energy distributions, we conclude that a simple combination of synchrotron and accretion disk emission reproduces the infrared-optical spectra while the X-ray to \gm-ray part is well reproduced by the inverse Compton scattering of low energy photons supplied by the broad line region. The black hole masses for each of the three sources are calculated to be $\gtrsim 4\times 10^8{M}_{\odot }$. The three studied sources have jet power at the level of, or beyond, the accretion luminosity.

4 figures, 3 tables, accepted for publication in ApJ

References in corpus (15)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• A Catalog of Quasar Properties from SDSS DR7
• The power of blazar jets
• The power of relativistic jets is larger than the luminosity of their accretion disks
• Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data
• GROND - a 7-channel imager
• Fermi/LAT broad emission line blazars
• Active galactic nuclei at gamma-ray energies
• Bulk Comptonization spectra in blazars
• Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state
• The power and production efficiency of blazar jets
• The Early Growth of the First Black Holes
• Broadband Observations of High Redshift Blazars
• NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-306
• NuSTAR, Swift, and GROND observations of the flaring MeV blazar: PMN J0641$-$0320

Cited by in corpus (15)

• Blazar spectral variability as explained by a twisting inhomogeneous jet
• Blazars at the Cosmic Dawn
• A spectral study of the black hole X-ray binary MAXI J1820+070 with AstroSat and NuSTAR
• The first hard X-ray spectral catalogue of Blazars observed by NuSTAR
• Multiwavelength Study of High-Redshift Blazars
• NuSTAR perspective on high-redshift MeV blazars
• BASS XXXIII: Swift-BAT blazars and their jets through cosmic time
• Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR
• Detection of a gamma-ray flare from the high-redshift blazar DA 193
• A NuSTAR view of powerful gamma-ray loud blazars
• Re-awakening of GRS 1716--249 after 23 years, observed by {\it Swift}/XRT and {\it NuSTAR}
• Detection of the high energy cut-off from the Seyfert 1.5 galaxy NGC 5273
• Identifying the 3FHL Catalog. VI. Swift Observations of 3FHL Unassociated Objects with Source Classification via Machine Learning
• Origin of multiwavelength emission from flaring high redshift blazar PKS 0537-286
• A new look at the extragalactic Very High Energy sky: searching for TeV-emitting candidates among the X-ray bright, non-Fermi detected blazar population