The radio structure of the $\gamma$-ray narrow-line Seyfert 1 galaxy SDSS J211852.96$-$073227.5

Abstract

The $\gamma$-ray narrow-line Seyfert 1 (NLS1) galaxies can be considered to be the third class of $\gamma$-ray active galactic nuclei possessing relativistic jets. In this paper, we present multi-band high resolution Very Long Baseline Array (VLBA) images of the $\gamma$-ray NLS1, SDSS J211852.96$-$073227.5 (J2118$-$0732, $z=0.26$). We find a core-jet radio morphology and significant flux density variations in the radio core. The high brightness temperature estimated from VLBA images and core variability demonstrate that it exhibits substantial relativistic beaming effects. From considering radio emission in several bands, we find that the source has an inverted spectrum above 1 GHz but a steep spectrum at low frequencies from 74 MHz to 1 GHz; these may arise from the present activity and the old diffuse/extended emission, respectively. The core-jet morphology, significant flux density variations, and beaming effect make J2118$-$0732 resemble a blazar. Considering the low mass of its central black hole and ongoing merger environment, J2118$-$0732 may represent a low-mass, low-power counterpart of blazars, and may finally evolve to a blazar.

arXiv comment12 pages, 6 figures. Published in ApJ

References in corpus (61)

• Fermi Large Area Telescope Fourth Source Catalog
• Fermi Large Area Telescope First Source Catalog
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• Optical and Radio Properties of Extragalactic Sources Observed by the FIRST and SDSS Surveys
• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• The VLA Low-frequency Sky Survey
• The Australia Telescope 20 GHz Survey: The Source Catalogue
• 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
• The Last of FIRST: The Final Catalog and Source Identifications
• A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
• MOJAVE XIII. Parsec-Scale AGN Jet Kinematics Analysis Based on 19 years of VLBA Observations at 15 GHz
• The VLBA Imaging and Polarimetry Survey at 5 GHz
• On the relation between AGN gamma-ray emission and parsec-scale radio jets
• Properties of flat-spectrum radio-loud Narrow-Line Seyfert 1 Galaxies
• A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Data Release 12
• A narrow line Seyfert 1--blazar composite nucleus in 2MASX J0324+3410
• SBS 0846+513: a new gamma-ray emitting Narrow-Line Seyfert 1 galaxy
• The colour of the narrow line Sy1-blazar 0324+3410
• Kiloparsec-scale Radio Structures in Narrow-line Seyfert 1 Galaxies
• Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective
• The Relative Orientation of Nuclear Accretion and Galaxy Stellar Disks in Seyfert Galaxies
• The Physical Nature of Polar Broad Absorption Line Quasars
• The SPECFIND V2.0 catalogue of radio cross-identifications and spectra. SPECFIND meets the Virtual Observatory
• Collimation, Acceleration and Recollimation Shock in the Jet of Gamma-Ray-emitting Radio-Loud Narrow-Line Seyfert 1 Galaxy 1H 0323+342
• The Radio Properties of Radio-Loud Narrow-Line Seyfert 1 Galaxies on Parsec Scales
• Gamma-ray Emitting Narrow Line Seyfert 1 Galaxies in The Sloan Digital Sky Survey
• Compact steep-spectrum sources as the parent population of flat-spectrum radio-loud NLS1s
• The disc-like host galaxies of radio-loud Narrow-Line Seyfert 1s
• Very Long Baseline Array Imaging of Parsec-scale Jet Structures in Radio-loud Narrow-line Seyfert 1 Galaxies
• General Physical Properties of Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies
• A Comparison of Radio Axis with Host Galaxy Plane Axis in Seyfert Galaxies
• Radio-to-gamma-ray Monitoring of the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022 from 2008 to 2011
• Contemporaneous VLBA 5 GHz Observations of LAT-Detected Blazars
• The Relativistic Jet Dichotomy and the End of the Blazar Sequence
• New candidate GHz Peaked Spectrum and Compact Steep Spectrum Sources
• Investigating kpc-scale radio emission properties of narrow-line Seyfert 1 galaxies
• High Radio Frequency Properties and Variability of Brightest Cluster Galaxies
• Japanese VLBI Network observations of radio-loud narrow-line Seyfert 1 galaxies
• A 5 GHz Southern Hemisphere VLBI Survey of Compact Radio SOurces - I
• An Investigation into the Geometry of Seyfert Galaxies
• Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN J0948+0022
• The ordinary life of the gamma-ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036
• Near-infrared morphologies of the host galaxies of narrow-line Seyfert 1 galaxies
• Investigating powerful jets in radio-loud Narrow Line Seyfert 1s
• The unification of relativistic jets
• Absorbed relativistic jets in radio-quiet narrow-line Seyfert 1 galaxies
• Short-Term Radio Variability and Parsec-Scale Structure in a Gamma-Ray Narrow-Line Seyfert 1 Galaxy 1H 0323+342
• Observations and properties of candidate high frequency GPS radio sources in the AT20G survey
• SDSS J211852.96-073227.5: a new γ-ray flaring narrow-line Seyfert 1 galaxy
• Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array
• Evidence of bar--driven secular evolution in the gamma--ray narrow--line Seyfert 1 galaxy FBQS J164442.5+261913
• Multiwavelength observations of the gamma-ray emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011
• The host galaxies of active galactic nuclei with powerful relativistic jets
• Parsec-scale jet properties of the gamma-ray quasar 3C 286
• A Recollimation Shock in a Stationary Jet Feature with Limb-brightening in the Gamma-ray Emitting Narrow-line Seyfert 1 Galaxy 1H 0323+342
• Gamma-ray Emitting Narrow-Line Seyfert 1 Galaxies: Past, Present, and Future
• SDSS J211852.96-073227.5: The first non-local, interacting, late-type intermediate Seyfert galaxy with relativistic jets
• TXS 2116$-$077: A Gamma-ray Emitting Relativistic Jet Hosted in a Galaxy Merger
• Radio jet structures at ~100 parsec and larger scales of the $\gamma$-ray-emitting narrow-line Seyfert 1 galaxy PMN J0948+0022

Cited by in corpus (4)

• Probing the Heart of Active Narrow-line Seyfert 1 Galaxies with VERA Wideband Polarimetry
• Long-term Swift and Metsähovi monitoring of SDSS J164100.10+345452.7 reveals multi-wavelength correlated variability
• Superluminal Motion and Jet Parameters in the Gamma-ray-Emitting Narrow-Line Seyfert 1 Galaxy TXS 1206+549
• Intra-night optical variability and radio characteristics of extremely radio-loud narrow-line Seyfert 1 galaxies