2011A&A...532A.115C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:47:52

2011A&A...532A.115C - Astronomy and Astrophysics, volume 532A, 115-115 (2011/8-1)

The influence of radio-extended structures on offsets between the optical and VLBI positions of sources in the ICRF2.

CAMARGO J.I.B., ANDREI A.H., ASSAFIN M., VIEIRA-MARTINS R. and DA SILVA NETO D.N.

Abstract (from CDS):

We investigate the differences between positions as determined by optical (direct imaging) and Very Long Baseline Interferometry (VLBI) techniques of extragalactic sources listed in the second realization of the International Celestial Reference Frame (ICRF2). We aim to verify the influence of the source's intrinsic structure on these differences. Instruments with mosaics of CCDs were used to acquire the optical positions presented here, which lead us to opt for overlapping techniques to build a virtual, continuous CCD over the whole angular size of the respective fields of view, whose translation of the resulting intrumental positions into positions that are consistent with those in the ICRF2 was obtained with the help of the UCAC2. The differences obtained between the optical and VLBI positions of the observed sources can reach more than 80 milliarsec for some measurements and, considering that they can hardly be explained by statistical fluctuations or systematic errors in the optical reference frame used here only, we argue that these differences can be related to the sources' X-band structure index (8.4GHz). In this context, the presence of the intrinsic structure should be considered when comparing the optical and VLBI positions of ICRF2 sources in the future.

Abstract Copyright:

Journal keyword(s): astrometry - reference systems - quasars: general

Simbad objects: 26

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Number of rows : 26

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 QSO B0138-097 BLL 01 41 25.83215547 -09 28 43.6741894   16.94 16.55 17.21   ~ 239 3
2 4C 13.14 QSO 02 31 45.89405431 +13 22 54.7162668   17.96 17.71 17.93   ~ 256 1
3 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1392 2
4 QSO B0237-2322 QSO 02 40 08.1742481040 -23 09 15.727160394   16.78 16.63     ~ 473 0
5 PKS 0405-123 Sy1 04 07 48.4309594137 -12 11 36.660481492   15.09 14.86 14.7   ~ 469 1
6 Mrk 1506 Sy1 04 33 11.0958197353 +05 21 15.617543663   15.72 15.05 10.08   ~ 1840 2
7 QSO B0440-003 QSO 04 42 38.66073910 -00 17 43.4203921   19.59 19.22 17.85   ~ 357 1
8 QSO B0506-612 QSO 05 06 43.9895985805 -61 09 40.990800300   17.16 16.85 16.9   ~ 165 2
9 QSO J0743-6726 QSO 07 43 31.61163970 -67 26 25.5464081   16.71 16.37     ~ 138 1
10 QSO B0754+10 BLL 07 57 06.64294682 +09 56 34.8523471   15.43 15.00 15.99   ~ 403 1
11 QSO B0808+019 BLL 08 11 26.70731189 +01 46 52.2202616   17.58 17.2 17.96   ~ 201 1
12 7C 082754.29+242103.00 QSO 08 30 52.08619070 +24 10 59.8204032   17.62 17.26 16.30   ~ 465 1
13 QSO B0829+047 BLL 08 31 48.8771360822 +04 29 39.086736269   17.10 16.4 14.55   ~ 417 2
14 4C 01.24B QSO 09 09 10.0921832543 +01 21 35.611559836   17.63 17.29 17.04   ~ 367 2
15 QSO B0920-397 QSO 09 22 46.41826064 -39 59 35.0683561   18.12 18.8     ~ 98 1
16 QSO J1130-1449 QSO 11 30 07.05259287 -14 49 27.3881476   17.17 16.90 16 16.97 ~ 625 1
17 QSO B1252+119 QSO 12 54 38.25561161 +11 41 05.8951798   16.99 16.64 16.76   ~ 242 1
18 3C 298.0 QSO 14 19 08.1804677481 +06 28 34.803573057   17.12 16.79     ~ 368 1
19 QSO B1445-161 QSO 14 48 15.05414424 -16 20 24.5488418   20.5 18.9 19.4   ~ 59 1
20 QSO B1532+016 QSO 15 34 52.45368142 +01 31 04.2065916   19.0 18.5 18.58   ~ 170 2
21 QSO B1546+0246 QSO 15 49 29.43684301 +02 37 01.1634197   17.57 17.42 15.53   ~ 316 1
22 4C 05.64 QSO 15 50 35.26924162 +05 27 10.4484262   19.10 18.73 19.02   ~ 284 1
23 QSO B1622-297 QSO 16 26 06.02083867 -29 51 26.9710860   18.41 20.5 17.6   ~ 364 0
24 QSO B1936-155 QSO 19 39 26.65774750 -15 25 43.0584183   19.44 19.4 18.80   ~ 145 1
25 QSO B1937-1009 QSO 19 39 57.2569480405 -10 02 41.525657493   18.800 19.0 17.188   ~ 167 1
26 ICRF J234636.8+093045 Sy1 23 46 36.83854476 +09 30 45.5148840   16.23 15.97 15.99   ~ 309 2

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2020.07.08-03:47:52

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