A Recollimation Shock in a Stationary Jet Feature with Limb-brightening in the Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxy 1H 0323+342

We report the discovery of a local convergence of a jet cross section in the quasi-stationary jet feature in the γ-ray-emitting narrow-line Seyfert 1 galaxy (NLS1) 1H 0323+342. The convergence site is located at ∼7 mas (corresponding to the order of 100 pc in deprojection) from the central engine. We also found limb-brightened jet structures at both the upstream and downstream of the convergence site. We propose that the quasi-stationary feature showing the jet convergence and limb-brightening occurs as a consequence of recollimation shock in the relativistic jets. The quasi-stationary feature is one of the possible γ-ray-emitting sites in this NLS1, in analogy with the HST-1 complex in the M87 jet. Monitoring observations have revealed that superluminal components passed through the convergence site and the peak intensity of the quasi-stationary feature, which showed apparent coincidences with the timing of observed γ-ray activities.

[1]  G. Bodo,et al.  Recollimation shocks and radiative losses in extragalactic relativistic jets , 2017, 1710.06713.

[2]  Caltech,et al.  On the black hole mass of the γ-ray emitting narrow-line Seyfert 1 galaxy 1H 0323+342 , 2016, 1609.08002.

[3]  E. Ros,et al.  MOJAVE. XIII. PARSEC-SCALE AGN JET KINEMATICS ANALYSIS BASED ON 19 YEARS OF VLBA OBSERVATIONS AT 15 GHz , 2016, 1603.03882.

[4]  L. Rezzolla,et al.  RECOLLIMATION SHOCKS IN MAGNETIZED RELATIVISTIC JETS , 2015, 1505.00933.

[5]  S. Komossa,et al.  Radio jet emission from GeV-emitting narrow-line Seyfert 1 galaxies , 2015, 1501.02158.

[6]  E. Ros,et al.  MOJAVE. XII. ACCELERATION AND COLLIMATION OF BLAZAR JETS ON PARSEC SCALES , 2014, 1410.8502.

[7]  C. D. Ravikumar,et al.  FERMI MONITORING OF RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES , 2014, 1410.0755.

[8]  D. Grupe,et al.  Properties of flat-spectrum radio-loud Narrow-Line Seyfert 1 Galaxies , 2014, 1409.3716.

[9]  A. Fabian,et al.  THE PECULIAR RADIO-LOUD NARROW LINE SEYFERT 1 GALAXY 1H 0323+342 , 2014, 1405.0715.

[10]  K. Wajima,et al.  SHORT-TERM RADIO VARIABILITY AND PARSEC-SCALE STRUCTURE IN A GAMMA-RAY NARROW-LINE SEYFERT 1 GALAXY 1H 0323+342 , 2013, 1312.3118.

[11]  Masanori Nakamura,et al.  DISCOVERY OF SUB- TO SUPERLUMINAL MOTIONS IN THE M87 JET: AN IMPLICATION OF ACCELERATION FROM SUB-RELATIVISTIC TO RELATIVISTIC SPEEDS , 2013, 1311.5709.

[12]  A. Readhead,et al.  Multifrequency studies of the narrow-line Seyfert 1 galaxy SBS 0846+513 , 2013, 1308.3709.

[13]  K. Asada,et al.  THE PARABOLIC JET STRUCTURE IN M87 AS A MAGNETOHYDRODYNAMIC NOZZLE , 2013, 1308.1436.

[14]  M. Kino,et al.  KILOPARSEC-SCALE RADIO STRUCTURES IN NARROW-LINE SEYFERT 1 GALAXIES , 2012, 1210.1303.

[15]  S. Iguchi,et al.  The parsec-scale jet of PKS 1749+096 , 2012, 1204.4150.

[16]  N. P. Lee,et al.  The kinematic of HST-1 in the jet of M 87 , 2012, 1202.0013.

[17]  Masanori Nakamura,et al.  THE STRUCTURE OF THE M87 JET: A TRANSITION FROM PARABOLIC TO CONICAL STREAMLINES , 2011, 1110.1793.

[18]  K. Asada,et al.  VERY LONG BASELINE ARRAY IMAGING OF PARSEC-SCALE JET STRUCTURES IN RADIO-LOUD NARROW-LINE SEYFERT 1 GALAXIES , 2011, 1107.5117.

[19]  Paul S. Smith,et al.  LOCATION OF γ-RAY FLARE EMISSION IN THE JET OF THE BL LACERTAE OBJECT OJ287 MORE THAN 14 pc FROM THE CENTRAL ENGINE , 2010, 1011.6454.

[20]  Paul S. Smith,et al.  PROBING THE INNER JET OF THE QUASAR PKS 1510−089 WITH MULTI-WAVEBAND MONITORING DURING STRONG GAMMA-RAY ACTIVITY , 2010, 1001.2574.

[21]  R. M. Campbell,et al.  The kinematics in the pc-scale jets of AGN - The case of S5 1803+784 , 2010, 1001.1973.

[22]  J. Chiang,et al.  RADIO-LOUD NARROW-LINE SEYFERT 1 AS A NEW CLASS OF GAMMA-RAY ACTIVE GALACTIC NUCLEI , 2009, 0911.3485.

[23]  I. Browne,et al.  The colour of the narrow line Sy1-blazar 0324+3410 , 2008, 0907.2400.

[24]  A. Levinson,et al.  RECOLLIMATION AND RADIATIVE FOCUSING OF RELATIVISTIC JETS: APPLICATIONS TO BLAZARS AND M87 , 2008, 0810.0562.

[25]  Paul S. Smith,et al.  The inner jet of an active galactic nucleus as revealed by a radio-to-γ-ray outburst , 2008, Nature.

[26]  M. Lister,et al.  The Inner Jet of the Radio Galaxy M87 , 2007, 0708.2695.

[27]  D. E. Harris,et al.  Superluminal Radio Features in the M87 Jet and the Site of Flaring TeV Gamma-Ray Emission , 2007, 0705.2448.

[28]  S. Komossa,et al.  A Narrow-Line Seyfert 1-Blazar Composite Nucleus in 2MASX J0324+3410 , 2007, astro-ph/0702329.

[29]  K. Wajima,et al.  VLBI Observations of the Most Radio-Loud, Narrow-Line Quasar SDSS J094857.3 + 002225 , 2006, astro-ph/0608507.

[30]  F. Aharonian,et al.  Dynamics and high-energy emission of the flaring HST-1 knot in the M 87 jet , 2006, astro-ph/0602220.

[31]  M. Cohen,et al.  MOJAVE: MONITORING OF JETS IN ACTIVE GALACTIC NUCLEI WITH VLBA EXPERIMENTS. XI. SPECTRAL DISTRIBUTIONS , 2014, 1404.0014.

[32]  William B. Sparks,et al.  HUBBLE SPACE TELESCOPE Observations of Superluminal Motion in the M87 Jet , 1999 .

[33]  A. Marscher,et al.  Hydrodynamical Models of Superluminal Sources , 1997 .