2013A&A...550A.113W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST02:03:28

2013A&A...550A.113W - Astronomy and Astrophysics, volume 550A, 113-113 (2013/2-1)

Kinematics of the compact symmetric object OQ 208 revisited.

WU F., AN T., BAAN W.A., HONG X.-Y., STANGHELLINI C., FREY S., XU H.-G., LIU X. and WANG J.-Y.

Abstract (from CDS):

A long-timeline kinematic study of the archetypal compact symmetric object (CSO) OQ 208 sheds light on the physical properties of the most compact radio sources. Archival data from the Very Long Baseline Array (VLBA) at 15GHz over a time span of 13.6yr were used to investigate the kinematics of the radio source. The flux density monitoring data obtained at the Michigan 26-m radio telescope were also used as supplementary information for analyzing the geometry of the radio structure. At 2.3-GHz, the radio emission is dominated by two mini-lobes separated by ∼10pc in a northeast-southwest (NE-SW) direction. At 8.4 and 15GHz, each lobe is further resolved into two subcomponents, which are identified as hotspots. A knotty jet is linked with the NE hotspot and traces back toward the geometric center. The core is too weak to be detected. Significant flux density variation is found in the primary hotspots with a maximum level of 62% (NE1) and 19% (SW1). The flare epoch of NE1 is earlier than that of SW1 by approximately 5.00yr, suggesting that the northeast lobe is advancing and the southwest lobe is receding. This light travel difference indicates a radial distance difference between the two hotspots of 1.53pc, which indicates an inclination angle of about 80.8 degrees between the radio jet and the line of sight. The angular separation rate between NE1 and SW1 is 0.027mas/yr, corresponding to a projected speed of 0.133c. The inner jet knot (J1) moves at 0.047mas/yr (or 0.230c), about 3.5 times the hotspot advancing speed. The large viewing angle and the modest jet speed suggest a mildly relativistic jet. The jet axis is close to the plane of the sky. The separation rate and the distance between the two primary hotspots result in a kinematic age of 255±17yr, confirming that OQ 208 is indeed a young radio source. In addition to the hotspot advancing motions, sideways motions provide evidence that the lobes are obstructed by the external interstellar medium.

Abstract Copyright:

Journal keyword(s): radio continuum: galaxies - galaxies: active

CDS comments: Fig. 1 components not in Simbad.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 20 Sy2 00 43 09.6 +52 03 35   19.0       ~ 200 0
2 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 235 1
3 ICRF J013220.4+562040 Bz? 01 32 20.44728196 +56 20 40.3705467           ~ 13 0
4 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2496 2
5 QSO B0710+439 QSO 07 13 38.16412910 +43 49 17.2071530   20.7       ~ 226 0
6 ICRF J094336.9-081930 LIN 09 43 36.94438939 -08 19 30.8134537   19.401   18.100   ~ 106 2
7 [VV98] J132412.0+404812 BLL 13 24 12.09560728 +40 48 11.7633699     19.50 19.4   ~ 34 0
8 ICRF J134733.3+121724 Sy2 13 47 33.36161542 +12 17 24.2402572   19.28 18.44 15.718   ~ 524 3
9 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 674 2
10 ICRF J151141.2+051809 Sy1 15 11 41.26654675 +05 18 09.2597600   18.49 17.80 13.95   ~ 82 0
11 ICRF J235509.4+495008 Sy2 23 55 09.45814510 +49 50 08.3395036   21.101   18.400   ~ 247 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-02:03:28

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