The X-ray emission in young radio AGNs

Abstract

In this work, we investigated the X-ray emission for a sample of young radio AGNs by combining their data from Chandra/XMM-Newton and at other wavebands. We find strong correlations between the X-ray luminosity $L_{\mathrm{X}}$ in 2$-$10 keV and the radio luminosities $L_{\mathrm{R}}$ at 5 GHz for VLBI radio-core, VLA radio-core and FIRST component, indicating that both pc- and kpc-scale radio emission strongly correlate with X-ray emission in these sources. We find approximately linear dependence of radio on X-ray luminosity in the sources with radiative efficient accretion flows (i.e., the Eddington ratio $R_{\mathrm{edd}}\gtrsim 10^{-3}$) with b $\sim$ 1 ($L_{\mathrm{R}}$ $\propto$ $L_{\mathrm{X}}^b$) and ${\xi }_{\mathrm{RX}}$ $\sim$ 1 in fundamental plane using VLBI data, where the dependence is consistent with the re-analysed result on the previous study in \cite{2016ApJ...818..185F} at $R_{\mathrm{edd}}\gtrsim 10^{-3}$, however is significantly deviated from the theoretical prediction of accretion flow as the origin of X-ray emission. In contrast to radio-quiet quasars, there is no significant correlation between $\Gamma$ and Eddington ratio. Our results seem to indicate that the X-ray emission of high-accreting young radio AGNs may be from jet. We constructed the SEDs for 18 sources (most are in radiative efficient accretion) including 9 galaxies and 9 quasars with high-quality X-ray data, and find that the X-ray emission of most quasars is more luminous than that of normal radio-quiet quasars. This is clearly seen from the quasar composite SED, of which the X-ray emission is apparently higher than that of radio-quiet quasars, likely supporting the jet-related X-ray emission in young radio AGNs. The scenario that the X-ray emission is from self-synchrotron Compton (SSC) is discussed.

15 pages,10 figures, 3 tables, accepted for publication in MNRAS

References in corpus (24)

• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Cosmic X-ray Surveys of Distant Active Galaxies: The Demographics, Physics, and Ecology of Growing Supermassive Black Holes
• The Last of FIRST: The Final Catalog and Source Identifications
• A Survey of Kiloparsec-Scale Radio Outflows in Radio-Quiet Active Galactic Nuclei
• Refining the fundamental plane of accreting black holes
• On the Evolution of and High-Energy Emission from GHz-Peaked-Spectrum Sources
• X-ray nature of the LINER nuclear sources
• X-ray Properties of the GigaHertz-Peaked and Compact Steep Spectrum Sources
• The black hole fundamental plane: revisit with a larger sample of radio and X-ray emitting broad-line AGNs
• The Chandra Survey of Extragalactic Sources in the 3CR Catalog: X-ray Emission from Nuclei, Jets, and Hotspots in the Chandra Archival Observations
• A new fundamental plane for radiatively efficient black-hole sources
• Chandra Survey of Nearby Galaxies: The Catalog
• The VSOP 5 GHz Active Galactic Nucleus Survey: V. Imaging Results for the Remaining 140 sources
• X-ray spectral variability of Seyfert 2 galaxies
• The most massive black holes on the Fundamental Plane of Black Hole Accretion
• Investigation on Young radio AGNs based on SDSS spectroscopy
• A comparison of hard X-ray photon indices and iron \ka emission lines in X-ray luminous narrow- and broad-line Seyfert 1 galaxies
• Extended X-ray emission in radio galaxies: the peculiar case of 3C 305
• A disc corona-jet model for the radio/X-ray correlation in black hole X-ray binaries
• Parsec-scale jet properties of the gamma-ray quasar 3C 286
• The multi-frequency parsec-scale structure of PKS 2254-367 (IC 1459): a luminosity-dependent break in morphology for the precursors of radio galaxies?
• Testing for Shock-Heated X-ray Gas Around Compact Steep Spectrum Radio Galaxies
• The X-ray emission of the most luminous 3CR radio sources
• A nearby luminous AGN sample optically selected from Hubble Space Telescope (HST)

Cited by in corpus (8)

• Compact steep-spectrum and peaked-spectrum radio sources
• Simulations of AGN Driven Galactic Outflow Morphology and Content
• The fundamental plane of black hole activity for low-luminosity radio active galactic nuclei across 1 < z < 4
• Do Radio Active Galactic Nuclei Reflect X-ray Binary Spectral States?
• Possible Evidence of a Universal Radio/X-ray Correlation in a near-Complete Sample of Hard X-ray Selected Seyfert Galaxies
• A compact symmetric ejection from the low mass AGN in the LINER galaxy NGC 4293
• Investigations on the optical properties and X-ray emission in compact radio AGN
• X-ray emission of radio-loud quasar SDSS J121426.52+140258.9: independent variations between optical/UV and X-ray emission