Japanese VLBI Network observations of radio-loud narrow-line Seyfert 1 galaxies

Abstract

We performed phase-reference very long baseline interferometry (VLBI) observations on five radio-loud narrow-line Seyfert 1 galaxies (NLS1s) at 8.4 GHz with the Japanese VLBI Network (JVN). Each of the five targets (RXS J08066+7248, RXS J16290+4007, RXS J16333+4718, RXS J16446+2619, and B3 1702+457) in milli-Jansky levels were detected and unresolved in milli-arcsecond resolutions, i.e., with brightness temperatures higher than 10^7 K. The nonthermal processes of active galactic nuclei (AGN) activity, rather than starbursts, are predominantly responsible for the radio emissions from these NLS1s. Out of the nine known radio-loud NLS1s, including the ones chosen for this study, we found that the four most radio-loud objects exclusively have inverted spectra. This suggests a possibility that these NLS1s are radio-loud due to Doppler beaming, which can apparently enhance both the radio power and the spectral frequency.

8 pages, 2 figures, accepted for publication in PASJ

References in corpus (23)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio-Loud and Radio-Quiet QSOs
• Radio-loud Narrow-Line Type 1 Quasars
• Slim Disk Model for Soft X-Ray Excess and Variability of Narrow-Line Seyfert 1 Galaxies
• X-Ray and Optical Variability in NGC 4051 and the Nature of Narrow-Line Seyfert 1 Galaxies
• M-BH - sigma relation for a Complete Sample of Soft X-ray Selected AGNs
• The Parsec-scale Radio Structure of NGC 1068 and the Nature of the Nuclear Radio Source
• VLBA Imaging of Central Engines in Radio Quiet Quasars
• Narrow-Line Seyfert 1s: 15 Years Later
• Motion and Properties of Nuclear Radio Components in Seyfert Galaxies Seen with VLBI
• The Radio Quiescence of Active Galaxies with High Accretion Rates
• Extreme Slim Accretion Disks and Narrow Line Seyfert 1 Galaxies: the Nature of the soft X-ray Hump
• The central engines of radio-quiet quasars
• NGC 5506 Unmasked as a Narrow Line Seyfert 1: A Direct View of the Broad Line Region using Near-IR Spectroscopy
• VLBI observations of the most radio-loud, narrow-line quasar SDSS J094857.3+002225
• Optical Properties of Radio-selected Narrow Line Seyfert 1 Galaxies
• SN1993J VLBI (I): The Center of the Explosion and a Limit on Anisotropic Expansion
• Milliarcsec-scale radio structure of a matched sample of Seyfert 1 and Seyfert 2 galaxies
• Radio Properties of NLS1s
• Bigradient Phase Referencing
• A Rapid X-ray Flare in the Radio-loud Narrow Line Quasar PKS 0558-504
• The radio loud narrow-line quasar SDSSJ172206.03+565451.6
• Was the Narrow Line Seyfert 1 RGB J0044+193 ever radio loud?

Cited by in corpus (32)

• A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
• Properties of flat-spectrum radio-loud Narrow-Line Seyfert 1 Galaxies
• Are the black hole masses in Narrow Line Seyfert 1 galaxies actually small?
• Kiloparsec-scale Radio Structures in Narrow-line Seyfert 1 Galaxies
• Radio-emitting narrow-line Seyfert 1 galaxies in the JVLA perspective
• Radio-loud Narrow Line Seyfert 1 under a different perspective: a revised black hole mass estimate from optical spectropolarimetry
• VLBI Monitoring of 3C 84 (NGC 1275) in Early Phase of the 2005 Outburst
• Collimation, Acceleration and Recollimation Shock in the Jet of Gamma-Ray-emitting Radio-Loud Narrow-Line Seyfert 1 Galaxy 1H 0323+342
• Parent population of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies
• The Radio Properties of Radio-Loud Narrow-Line Seyfert 1 Galaxies on Parsec Scales
• The host-galaxy of the gamma-ray Narrow-line Seyfert 1 galaxy 1H~0323+342
• Very Long Baseline Array Imaging of Parsec-scale Radio Emissions in Nearby Radio-quiet Narrow-line Seyfert 1 Galaxies
• Very Long Baseline Array Imaging of Parsec-scale Jet Structures in Radio-loud Narrow-line Seyfert 1 Galaxies
• HI absorption towards nearby compact radio sources
• Investigating kpc-scale radio emission properties of narrow-line Seyfert 1 galaxies
• The compact radio structure of radio-loud narrow line Seyfert 1 galaxies
• [O III] line properties in two samples of radio-emitting 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
• X-ray observational signature of a black hole accretion disc in an active galactic nucleus RXJ1633+4718
• Capabilities and prospects of the East Asia Very Long Baseline Interferometry Network
• A Fanaroff-Riley Type I Candidate in Narrow-Line Seyfert 1 Galaxy Mrk 1239
• VLBI Detections of Parsec-Scale Nonthermal Jets in Radio-Loud Broad Absorption Line Quasars
• Coexistence of a non thermal jet and a complex ultra fast X-ray outflow in a moderately luminous AGN
• A Radio Quasi-periodic Oscillation of 176 day in the Radio-loud Narrow-line Seyfert 1 Galaxy J0849+5108
• Variable optical polarization during high state in gamma-ray loud narrow line Seyfert 1 galaxy 1H 0323+342
• A Radio Detection Survey of Narrow-Line Seyfert 1 Galaxies using Very-Long-Baseline Interferometry at 22 GHz
• Compact radio emission from z~0.2 X-ray bright AGN
• Evidence of galaxy interaction in the Narrow-line Seyfert 1 galaxy IRAS17020+4544 seen by NOEMA
• Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020+4320: Recently Restarted Jet Activity?
• The radio structure of the $\gamma$-ray narrow-line Seyfert 1 galaxy SDSS J211852.96$-$073227.5
• The Parsec-scale Structure, Kinematics, and Polarization of Radio-Loud Narrow-Line Seyfert 1 Galaxies
• Unravelling the origin of extended radio emission in narrow-line Seyfert 1 galaxies with the JVLA