Inner jet kinematics and the viewing angle towards the γ-ray narrow-line Seyfert 1 galaxy 1H 0323+342

Abstract

Near-Eddington accretion rates onto low-mass black holes are thought to be a prime driver of the multi-wavelength properties of the narrow-line Seyfert 1 (NLS1) population of active galactic nuclei (AGN). Orientation effects have repeatedly been considered as another important factor involved, but detailed studies have been hampered by the lack of measured viewing angles towards this type of AGN. Here we present multi-epoch, 15 GHz VLBA images (MOJAVE program) of the radio-loud and Fermi/LAT-detected NLS1 galaxy 1H 323+342. These are combined with single-dish, multi-frequency radio monitoring of the source's variability, obtained with the Effelsberg 100-m and IRAM 30-m telescopes, in the course of the F-GAMMA program. The VLBA images reveal 6 components with apparent peeds of ~1 to ~7 c, and one quasi-stationary feature. Combining the obtained apparent jet speed (${\beta }_{app}$) and variability Doppler factor ($D_{var}$) estimates together with other methods, we constrain the viewing angle towards 1H 0323+342 to $\theta \le 4-13$ deg. Using literature values of ${\beta }_{app}$ and $D_{var}$, we also deduce a viewing angle of $\le$ 8-9 deg towards another radio- and γ-ray-loud NLS1, namely SBS 0846+513.

16 pages, 3 figures, accepted for publication in Research in Astronomy and Astrophysics

References in corpus (17)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Doppler factors, Lorentz factors and viewing angles for quasars, BL Lacertae objects and radio galaxies
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
• 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
• On the nature of Seyfert galaxies with high [OIII]5007 blueshifts
• Detection of significant cm to sub-mm band radio and gamma-ray correlated variability in Fermi bright blazars
• A narrow line Seyfert 1--blazar composite nucleus in 2MASX J0324+3410
• Radio jet emission from GeV-emitting narrow-line Seyfert 1 galaxies
• Orientation dependency of broad-line widths in quasars and consequences for black-hole mass estimation
• Testing the inverse-Compton catastrophe scenario in the intra-day variable blazar S5 0716+71, III. Rapid and correlated flux density variability from radio to sub-mm bands
• The Peculiar Radio-Loud Narrow Line Seyfert 1 Galaxy 1H 0323+342
• Kiloparsec-scale jets in three radio-loud narrow-line Seyfert 1 galaxies
• Blazar nuclei in radio-loud narrow-line Seyfert 1?
• Jet Properties of GeV-Selected Radio-Loud Narrow-Line Seyfert 1 Galaxies and Possible Connection to Their Disk and Corona
• Fermi Monitoring of Radio-loud Narrow Line Seyfert 1 Galaxies
• Variable optical polarization during high state in gamma-ray loud narrow line Seyfert 1 galaxy 1H 0323+342

Cited by in corpus (11)

• The relativistic jet of the gamma-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342
• Radio morphology of southern narrow-line Seyfert 1 galaxies with Very Large Array observations
• Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)
• Radio jet structures at ~100 parsec and larger scales of the $\gamma$-ray-emitting narrow-line Seyfert 1 galaxy PMN J0948+0022
• The radio structure of the peculiar narrow-line Seyfert 1 galaxy candidate J1100+4421
• The relativistic jet of the $\gamma$-ray emitting narrow-line Seyfert 1 galaxy PKS J1222$+$0413
• Radio spectra of narrow-line Seyfert 1 galaxies observed with ATCA and VLASS
• The radio-loud narrow-line Seyfert 1 galaxy 1H 0323+342 in a galaxy merger
• Modelling the variable emission states of $\gamma$-ray emitting Narrow-Line Seyfert 1 galaxies
• Probing the Heart of Active Narrow-line Seyfert 1 Galaxies with VERA Wideband Polarimetry
• The Origin of X-ray Emission in the Gamma-ray emitting Narrow-Line Seyfert 1 1H 0323+342