2004A&A...428..847P


Query : 2004A&A...428..847P

2004A&A...428..847P - Astronomy and Astrophysics, volume 428, 847-866 (2004/12-4)

Absolute kinematics of radio source components in the complete S5 polar cap sample. II. First and second /session define format EPOCH1 = maps at 15 GHz.

PEREZ-TORRES M.A., MARCAIDE J.M., GUIRADO J.C. and ROS E.

Abstract (from CDS):

We observed the thirteen extragalactic radio sources of the complete S5 polar cap sample at 15.4GHz with the Very Long Baseline Array, on 27 July 1999 (1999.57) and 15 June 2000 (2000.46). We present the maps from those two epochs, along with maps obtained from observations of the 2cm VLBA survey for some of the sources of the sample, making a total of 40 maps. We discuss the apparent morphological changes displayed by the radio sources between the observing epochs. Our VLBA observations correspond to the first two epochs at 15.4GHz of a program to study the absolute kinematics of the radio source components of the members of the sample, by means of phase delay astrometry at 8.4GHz, 15.4GHz, and 43GHz. Our 15.4GHz VLBA imaging allowed us to disentangle the inner milliarcsecond structure of some of the sources, thus resolving components that appeared blended at 8.4GHz. For most of the sources, we identified the brightest feature in each radio source with the core. These identifications are supported by the spectral index estimates for those brightest features, which are in general flat, or even inverted. Most of the sources display core-dominance in the overall emission, as given by the core-to-extended ratio in the 15.4GHz frame, Q. We find that three of the sources have their most inverted spectrum component shifted with respect to the origin in the map, which approximately coincides with the peak-of-brightness at both 15.4GHz and 8.4GHz.

Abstract Copyright:

Journal keyword(s): astrometry - techniques: interferometric - galaxies: quasars: general - galaxies: BL Lacertae objects: general - radio continuum: general

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 QSO B0016+73 QSO 00 19 45.78637230 +73 27 30.0176020     19.00 18.26   ~ 297 1
2 QSO B0153+744 BLL 01 57 34.9650498168 +74 42 43.225049844   16 16.0 16.7   ~ 212 1
3 6C 021252+733537 BLL 02 17 30.81335327 +73 49 32.6217355     19.00 18.97   ~ 460 1
4 QSO B0454+844 BLL 05 08 42.36351222 +84 32 04.5441733     16.5 18.95   ~ 243 1
5 6C 061543+820331 QSO 06 26 03.00623818 +82 02 25.5679443   17.5 17.5 18.52   ~ 158 1
6 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1307 1
7 4C 71.07 Bla 08 41 24.36528508 +70 53 42.1730435     17.30 16.8   ~ 782 1
8 6C 103912+811006 QSO 10 44 23.06257022 +80 54 39.4430485     16.5 18.29   ~ 218 1
9 8C 1150+812 QSO 11 53 12.49922322 +80 58 29.1545718     19.40 18.54   ~ 238 1
10 7C 1749+7006 BLL 17 48 32.8402992264 +70 05 50.768819304   17.46 17.01 15.48   ~ 434 1
11 8C 1803+784 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 15.90 15.46   ~ 746 1
12 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     16.06 15.11   ~ 536 2
13 8C 2007+777 BLL 20 05 30.9987913056 +77 52 43.248139536     16.5 17.36   ~ 450 1

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