Investigation on Young radio AGNs based on SDSS spectroscopy

Abstract

The Gigahertz Peaked Spectrum (GPS) sources, Compact Steep Spectrum (CSS) radio sources, and High Frequency Peakers (HFP) radio sources are thought to be young radio AGNs, at the early stage of AGN evolution. We investigated the optical properties of the largest sample of 126 young radio AGNs based on the spectra in SDSS DR12. We find the black hole masses $M_{\mathrm{BH}}$ range from $10^{7.32}$ to $10^{9.84}$ ${\mathrm{M}}_{\mathrm{sun}}$, and the Eddington ratios $R_{\mathrm{edd}}$ vary from $10^{-4.93}$ to $10^{0.37}$, suggesting that young radio AGNs have various accretion activities and not all are accreting at high accretion rate. Our young radio sources generally follow the evolutionary trend towards large-scale radio galaxies with increasing linear size and decreasing accretion rate in the radio power - linear size diagram. The radio properties of low luminosity young radio AGNs with low $R_{\mathrm{edd}}$ are discussed. The line width of [O III] $\lambda 5007$ core (${\sigma }_{[\mathrm{OIII}]}$) is found to be a good surrogate of stellar velocity dispersion ${\sigma }_{\ast }$. The radio luminosity $L_{5GHz}$ correlates strongly with [O III] core luminosity $L_{[\mathrm{OIII}]}$, suggesting that radio activity and accretion are closely related in young radio sources. We find one object that can be defined as narrow-line Seyfert 1 galaxies (NLS1s), representing a population of young AGNs both with young jet and early accretion activity. The optical variabilities of 15 quasars with multi-epoch spectroscopy were investigated. Our results show that the optical variability in young AGN quasars presents low variations ($⩽60\%$) similar to the normal radio-quiet quasars.

26 pages, 19 figures, 4 tables, accepted for publication in MNRAS

References in corpus (27)

• A Catalog of Quasar Properties from SDSS DR7
• Improving the full spectrum fitting method: accurate convolution with Gauss-Hermite functions
• Evolutionary Stellar Population Synthesis with MILES. Part I: The Base Models and a New Line Index System
• Active Galactic Nuclei: what's in a name?
• Biases in Virial Black Hole Masses: An SDSS Perspective
• A Comprehensive Study of 2 000 Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey: I. The Sample
• Radio-loud Narrow-Line Type 1 Quasars
• A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
• Fast outflows in compact radio sources: evidence for AGN-induced feedback in the early stages of radio source evolution
• CIV 1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• The Dynamic Evolution of Young Extragalactic Radio Sources
• Narrow-line Seyfert 1 Galaxies and the M_BH - sigma Relation
• A spectroscopic analysis of a sample of narrow-line Seyfert 1 galaxies selected from the Sloan Digital Sky Survey
• GPS radio sources: new optical observations and an updated master list
• Parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies
• Constraining the nature of High Frequency Peakers. I. The spectral variability
• Kiloparsec-scale jets in three radio-loud narrow-line Seyfert 1 galaxies
• SDSSJ143244.91+301435.3: a link between radio-loud narrow-line Seyfert 1 galaxies and compact steep-spectrum radio sources?
• Tracing jet--ISM interaction in young AGN: correlations between [OIII] 5007 and 5-GHz emission
• The Million Optical - Radio/X-ray Associations (MORX) Catalogue
• Parsec-scale jet properties of the gamma-ray quasar 3C 286
• SDSSJ143244.91+301435.3 at VLBI: a compact radio galaxy in a narrow-line Seyfert 1
• Constraining the nature of High Frequency Peakers. II. Polarization properties
• High Frequency Peakers: The Faint Sample
• Changing-look AGNs or short-lived radio sources?
• The follow-up EVN observations of twelve GPS radio sources at 5 GHz

Cited by in corpus (16)

• Quasar Feedback Survey: Multi-phase outflows, turbulence and evidence for feedback caused by low power radio jets inclined into the galaxy disk
• The Quasar Feedback Survey: Discovering hidden Radio-AGN and their connection to the host galaxy ionised gas
• Gamma-rays from young radio galaxies and quasars
• Jet Properties of Compact Steep-Spectrum Sources and an Eddington-Ratio-Driven Unification Scheme of Jet Radiation in Active Galactic Nuclei
• Caltech-NRAO Stripe 82 Survey (CNSS). IV. The Birth of Radio-loud Quasar 013815+00
• Spectroscopic classification, variability and SED of the Fermi-detected CSS 3C 286: the radio-loudest NLS1 galaxy?
• The galaxy population within the virial radius of the Perseus cluster
• Intermediate-mass black holes: finding of episodic, large-scale and powerful jet activity in a dwarf galaxy
• The X-ray emission in young radio AGNs
• Optical Properties of Peaked Spectrum Radio Sources
• Transient radio emission from low-redshift galaxies at z<0.3 revealed by VLASS and FIRST surveys
• GeV $\gamma$-ray Emission of Compact Steep-Spectrum Source 4C +39.23B
• A compact symmetric ejection from the low mass AGN in the LINER galaxy NGC 4293
• Radio properties of high-redshift galaxies at $z\ge 1$
• Hunting for the nature of the enigmatic narrow-line Seyfert 1 galaxy PKS 2004-447
• Relativistic Jets in Gamma-Ray-Emitting Narrow-Line Seyfert 1 Galaxies