2012ApJS..198....5A


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST03:32:57

2012ApJS..198....5A - Astrophys. J., Suppl. Ser., 198, 5 (2012/January-0)

VLBI observations of 10 compact symmetric object candidates: expansion velocities of hot spots.

AN T., WU F., YANG J., TAYLOR G.B., HONG X., BAAN W.A., LIU X., WANG M., ZHANG H., WANG W., CHEN X., CUI L., HAO L. and ZHU X.

Abstract (from CDS):

Observations of 10 Compact Symmetric Object (CSO) candidates have been made with the Very Long Baseline Array (VLBA) at 8.4 GHz in 2005 and with a combined Chinese and European Very Long Baseline Interferometry (VLBI) array at 8.4 GHz in 2009. The 2009 observations incorporate for the first time the two new Chinese telescopes at Miyun and Kunming for international astrophysical observations. The observational data, in combination with archival VLBA data from previous epochs, have been used to derive the proper motions of the VLBI components. Because of the long time baseline of ∼16 years of the VLBI data sets, the expansion velocities of the hot spots can be measured at an accuracy as high as ∼1.3 µas/yr. Six of the ten sources are identified as CSOs with a typical double or triple morphology on the basis of both spectral index maps and their mirror symmetry of proper motions of the terminal hot spots. The compact double source J1324+4048 is also identified as a CSO candidate. Among the three remaining sources, J1756+5748 and J2312+3847 are identified as core-jet sources with proper motions of their jet components relating to systemic source expansion. The third source J0017+5312 is likely also a core-jet source, but a robust detection of a core is needed for an unambiguous identification. The kinematic ages of the CSOs derived from proper motions range from 300 to 2500 years. The kinematic age distribution of the CSOs confirm an overabundance of compact young CSOs with ages less than 500 years. CSOs with known kinematic ages may be used to study the dynamical evolution of extragalactic radio sources at early stages.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: jets - galaxies: nuclei - radio continuum: galaxies

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ICRF J001751.7+531219 QSO 00 17 51.7591727327 +53 12 19.121224807           ~ 19 1
2 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 243 1
3 ICRF J013220.4+562040 Bz? 01 32 20.4473504 +56 20 40.370031           ~ 17 0
4 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2585 2
5 NVSS J051812+473056 Rad 05 18 12.0898222 +47 30 55.528297           ~ 12 0
6 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 477 2
7 QSO B0646+600 QSO 06 50 31.2543062 +60 01 44.554767   18.9 18.6 19.65   ~ 108 1
8 ICRF J092703.0+390220 Sy1 09 27 03.0139516273 +39 02 20.847968628   17.17 17.00 16.486   ~ 939 1
9 ICRF J115825.7+245017 Sy1 11 58 25.78753020 +24 50 17.9640837   20.27 19.40 16.58   ~ 72 1
10 [VV98] J132412.0+404812 BLL 13 24 12.0956043 +40 48 11.762252     19.50 19.4   ~ 37 0
11 4C 58.26 Bz? 13 35 25.9285191 +58 44 00.291595       21.91   ~ 48 1
12 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 699 2
13 ICRF J151141.2+051809 Sy1 15 11 41.2664270 +05 18 09.259581   18.49 17.80 13.95   ~ 94 0
14 ICRF J173458.3+092658 Bla 17 34 58.3768027 +09 26 58.265118       20.8   ~ 56 1
15 7C 1755+5749 QSO 17 56 03.6268378209 +57 48 47.986168938     18.00 18.4   ~ 48 1
16 QSO B1946+708 BLL 19 45 53.5195839 +70 55 48.727414   18.726 16.70 17.199   ~ 132 2
17 ICRF J220330.9+100742 Bz? 22 03 30.9525909 +10 07 42.586730       21.38   ~ 35 0
18 QSO B2310+385 QSO 23 12 58.7939802 +38 47 42.660885     17.5     ~ 39 0

    Equat.    Gal    SGal    Ecl

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2021.05.17-03:32:57

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