The Impact of the CMB on the Evolution of high-z Blazars
arXiv:2106.01953 · doi:10.1093/mnras/stab1612
Abstract
Different works have recently found an increase of the average X-ray-to-radio luminosity ratio with redshift in the blazar population. We evaluate here whether the inverse Compton interaction between the relativistic electrons within the jet and the photons of the Cosmic Microwave Background (IC/CMB) can explain this trend. Moreover, we test whether the IC/CMB model can also be at the origin of the different space density evolutions found in X-ray and radio selected blazar samples. By considering the best statistically complete samples of blazars selected in the radio or in the X-ray band and covering a large range of redshift (0.5 z 5.5), we evaluate the expected impact of the CMB on the observed X-ray emission on each sample and then we compare these predictions with the observations. We find that this model can satisfactorily explain both the observed trend of the X-ray-to-radio luminosity ratios with redshift and the different cosmological evolutions derived from the radio and X-ray band. Finally, we discuss how currently on-going X-ray missions, like eROSITA, could help to further constrain the observed evolution at even higher redshifts (up to z6-7).
9 pages, 8 figures and 2 tables. Accepted for publication in MNRAS
References in corpus (23)
- HI4PI: A full-sky HI survey based on EBHIS and GASS
- An Observational Determination of the Bolometric Quasar Luminosity Function
- Active Galactic Nuclei: what's in a name?
- BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
- The X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges
- eROSITA Science Book: Mapping the Structure of the Energetic Universe
- The 5th edition of the Roma-BZCAT. A short presentation
- BAT AGN Spectroscopic Survey I: Spectral Measurements, Derived Quantities, and AGN Demographics
- The 300 kpc Long X-ray Jet in PKS 1127-145, z=1.18 Quasar: Constraining X-ray Emission Models
- Blazar candidates beyond redshift 4 observed by Swift
- Quasar X-ray jets: Gamma-ray diagnostics of the synchrotron and inverse Compton hypotheses, the case of 3C 273
- SRG/eROSITA uncovers the most X-ray luminous quasar at z>6
- Fermi non-detections of four X-ray jet sources and implications for the IC/CMB mechanism
- First constraints on the AGN X-ray luminosity function at from an eROSITA-detected quasar
- Blazars at the Cosmic Dawn
- The space density of z>4 blazars
- SDSS J013127.34-032100.1: a candidate blazar with a 11 billion solar mass black hole at =5.18
- Detecting Relativistic X-ray Jets in High-Redshift Quasars
- NuSTAR perspective on high-redshift MeV blazars
- Inverse-Compton scattering in the resolved jet of the high-redshift quasar PKS J1421-0643
- Cosmological Evolution of Flat-Spectrum Radio Quasars based on the {\it Swift}/BAT 105-month Catalog and Their Contribution to the Cosmic MeV Gamma-ray Background Radiation
- Relativistic X-ray jets at high redshift
- Extended X-ray emission from the z=4.26 radio galaxy 4C 63.20