On the Evolution of the Cores of Radio Sources and Their Extended Radio Emission

Abstract

The work in this paper aims at determining the evolution and possible co-evolution of radio-loud active galactic nuclei (AGNs) and their cores via their radio luminosity functions (i.e., total and core RLF respectively). Using a large combined sample of 1063 radio-loud AGNs selected at low radio frequency, we investigate the radio luminosity function (RLF) at 408 MHz of steep-spectrum radio sources. Our results support a luminosity-dependent evolution. Using core flux density data of the complete sample 3CRR, we investigate the core RLF at 5.0 GHz. Based on the combined sample with incomplete core flux data, we also estimate the core RLF using a modified factor of completeness. Both results are consistent and show that the comoving number density of radio cores displays a persistent decline with redshift, implying a negative density evolution. We find that the core RLF is obviously different from the total RLF at 408 MHz band which is mainly contributed by extended lobes, implying that the cores and extended lobes could not be co-evolving at radio emission.

10 pages, 9 figures and 1 table, accepted for publication in the Astrophysical Journal

References in corpus (16)

• Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
• The Radio-Loud Fraction of Quasars is a Strong Function of Redshift and Optical Luminosity
• Accretion states and radio loudness in Active Galactic Nuclei: analogies with X-ray binaries
• Magnetic Fields in the Center of the Perseus Cluster
• Observed properties of FRII quasars and radio galaxies at z < 1.0
• A new method for estimating frequency-dependent core shifts in active galactic nucleus jets
• The VSOP 5 GHz Active Galactic Nucleus Survey: V. Imaging Results for the Remaining 140 sources
• Radio Properties of Low Redshift Broad Line Active Galactic Nuclei
• The origin of the infrared emission in radio galaxies I: new mid- to far-infrared and radio observations of the 2Jy sample
• Double-double radio galaxies: further insights into the formation of the radio structures
• Mid-infrared spectroscopy of high-redshift 3CRR sources
• Complete identification of the Parkes half-Jansky sample of GHz peaked spectrum radio galaxies
• A Combined EIS-NVSS Survey Of Radio Sources II: Infrared imaging and the K-z relation
• The 6C** sample of steep-spectrum radio sources: II - Redshift distribution and the space density of high-redshift radio galaxies
• Evidence of a double-double morphology in B0818+214
• Thermal and Nonthermal Radio Galaxies

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