Extragalactic Peaked-Spectrum Radio Sources at Low-Frequencies are Young Radio Galaxies

Abstract

We present a sample of 373 peaked-spectrum (PS) sources with spectral peaks around 150MHz, selected using a subset of two LOFAR all-sky surveys, the LOFAR Two Meter Sky Survey and the LOFAR LBA Sky Survey. These surveys are the most sensitive low-frequency widefield surveys to date, allowing us to select low-luminosity PS sources. Our sample increases the number of known PS sources in our survey area by a factor 50. The 5GHz luminosity distribution of our PS sample shows we sample the lowest luminosity PS sources to-date by nearly an order of magnitude. Since high-frequency PS sources and compact steep-spectrum sources are hypothesised to be the precursors to large radio galaxies, we investigate whether this is also the case for our sample of low-frequency PS sources. Using optical line emission criteria, we find that our PS sources are predominately high-excitation radio galaxies instead of low-excitation radio galaxies, corresponding to a quickly evolving population. We compute the radio source counts of our PS sample, and find they are scaled down by a factor of $\sim$40 compared to a general sample of radio-loud active galactic nuclei (AGN). This implies that the lifetimes of PS sources are 40 times shorter than large scale radio galaxies, if their luminosity functions are identical. To investigate this, we compute the first radio luminosity function for a homogeneously-selected PS sample. We find that for 144MHz luminosities $\gtrsim 10^{25}$W Hz${}^{-1}$, the PS luminosity function has the same shape as an unresolved radio-loud AGN population but shifted down by a factor of $\sim$10. We interpret this as strong evidence that these high-luminosity PS sources evolve into large-scale radio-loud AGN. For local, low-luminosity PS sources, there is a surplus of PS sources, which we hypothesise to be the addition of frustrated PS sources that do not evolve into large-scale AGN.

arXiv comment21 pages, accepted in Astronomy & Astrophysics

References in corpus (57)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• The Seventh Data Release of the Sloan Digital Sky Survey
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• LOFAR: The LOw-Frequency ARray
• The Host Galaxies and Classification of Active Galactic Nuclei
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• On the fundamental dichotomy in the local radio-AGN population: accretion, evolution, and host galaxy properties
• The LOFAR Two-metre Sky Survey - II. First data release
• The LOFAR Two-metre Sky Survey -- V. Second data release
• Hot and cold gas accretion and feedback in radio-loud active galaxies
• The Australia Telescope 20 GHz Survey: The Source Catalogue
• The Very Large Array Low-frequency Sky Survey Redux (VLSSr)
• An optical spectroscopic survey of the 3CR sample of radio galaxies with z<0.3. II. Spectroscopic classes and accretion modes in radio-loud AGN
• Compact steep-spectrum and peaked-spectrum radio sources
• The Dynamic Evolution of Young Extragalactic Radio Sources
• The LoTSS view of radio AGN in the local Universe. The most massive galaxies are always switched on
• SDSSJ150634.27+013331.6: the second compact elliptical galaxy in the NGC5846 group
• A universal ultraviolet-optical colour-colour-magnitude relation of galaxies
• The Rapid ASKAP Continuum Survey Paper II: First Stokes I Source Catalogue Data Release
• Extragalactic Peaked-Spectrum Radio Sources at Low Frequencies
• The LOFAR Two-metre Sky Survey (LoTSS) III. First Data Release: optical/IR identifications and value-added catalogue
• Luminosity function, sizes and FR dichotomy of radio-loud AGN
• A survey of Low Luminosity Compact sources and its implication for evolution of radio-loud AGNs. I. Radio data
• The properties of extragalactic radio sources selected at 20 GHz
• High Frequency Peakers: young radio sources or flaring blazars?
• Relativistic jet feedback II: Relationship to gigahertz peak spectrum and compact steep spectrum radio galaxies
• The COINS Sample - VLBA Identifications of Compact Symmetric Objects
• The LOFAR LBA Sky Survey I. survey description and preliminary data release
• All-purpose, all-sky photometric redshifts for the Legacy Imaging Surveys Data Release 8
• Broadband Spectral Modeling of the Extreme Gigahertz-Peaked Spectrum Radio Source PKS B0008-421
• GAMA/WiggleZ: The 1.4GHz radio luminosity functions of high- and low-excitation radio galaxies and their redshift evolution to z=0.75
• A new sample of faint Gigahertz Peaked Spectrum radio sources
• The LOFAR Two-metre Sky Survey IV. First Data Release: Photometric redshifts and rest-frame magnitudes
• GPS radio sources: new optical observations and an updated master list
• LOFAR-Boötes: Properties of high- and low-excitation radio galaxies at $0.5<z<2.0$
• Compact Symmetric Objects and Supermassive Binary Black Holes in the VLBA Imaging and Polarimetry Survey
• On the spectro-photometric properties of the bulk of the radio-loud AGN population
• Integrated Radio Continuum Spectra of Galaxies
• Cosmic evolution of low-excitation radio galaxies in the LOFAR Two-meter Sky Survey Deep Fields
• New candidate GHz Peaked Spectrum and Compact Steep Spectrum Sources
• Extremely deep 150 MHz source counts from the LoTSS Deep Fields
• A Parkes half-Jansky sample of GPS galaxies
• Interplanetary Scintillation studies with the Murchison Wide-field Array II: Properties of sub-arcsecond compact sources at low radio frequencies
• An unbiased sample of bright southern Compact Steep Spectrum and Gigahertz Peaked Spectrum Sources
• Compact radio cores: from the first black holes to the last
• FIRST-based survey of Compact Steep Spectrum sources, IV. Multifrequency VLBA observations of very compact objects
• The Impact of the Environment on the Early Stages of Radio Source Evolution
• The last breath of the young gigahertz-peaked spectrum radio source PKS 1518+047
• Extragalactic megahertz-peaked spectrum radio sources at milliarcsecond scales
• The LOFAR Two-metre Sky Survey Deep fields: A new analysis of low-frequency radio luminosity as a star-formation tracer in the Lockman Hole region
• Spectral Properties and the Effect on Redshift Cut-off of Compact AGNs from the AT20G Survey
• The XXL Survey: XXXI. Classification and host galaxy properties of 2.1 GHz ATCA XXL-S radio sources
• Optical Properties of Peaked Spectrum Radio Sources

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• No strong radio absorption detected in the low-frequency spectra of radio-loud quasars at z > 5.6
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