1999A&AS..139..297C


Query : 1999A&AS..139..297C

1999A&AS..139..297C - Astron. Astrophys., Suppl. Ser., 139, 297-304 (1999/October-2)

CCD astrometry of faint compact extragalactic radio sources. I. First results and description of the program.

COSTA E. and LOYOLA P.

Abstract (from CDS):

Optical positions relative to the Hipparcos Catalogue (ESA 1997) have been obtained for the optical counterparts of 15 faint (B∼20-23) southern compact extragalactic radio sources (CERS). Most of these sources are not adequately observable (or simply not visible) by means of direct photography with a conventional wide-field telescope, so the positions were determined using a multi-step procedure involving CCD and photographic observations, a method which responded both to the need to attain small rms errors and the need to refer the positions to a standard astrometric system. Estimated precisions as good as 60 mas were achieved. For five of the above objects, namely 0936-853, 1221-829, 1604-333, 1647-296 and 1706+006, we are proposing a new optical identification. A comparison with VLBI radio positions available for these sources is presented. The residuals obtained are in most cases consistent with the precision of our optical data, and provide an evaluation of these faint objects as possible radio/optical link sources (or their identification as astrophysically interesting astrometric outliers). Twelve of the CERS observed are either defining or are candidate fiducial objects of the present realization of the International Celestial Reference System (ICRS, Ma et al., 1998AJ....116..516M), so the optical data obtained for them is potentially useful to help maintain and possibly improve the current link of the Hipparcos reference frame to the ICRS.

Abstract Copyright:

Journal keyword(s): astrometry - reference systems

Simbad objects: 24

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Number of rows : 24
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 B0826-373 QSO 08 28 04.78023133 -37 31 06.2815112   16       ~ 59 1
2 ICRF J093032.5-853359 QSO 09 30 32.5686067272 -85 33 59.686387272           ~ 24 1
3 ICRF J093334.4-113925 AGN 09 33 34.45355476 -11 39 25.4776765       24.04   ~ 26 2
4 PKS 1034-058 Rad 10 36 48.198 -06 05 51.24           ~ 7 0
5 QSO J1051-3138 QSO 10 51 04.77754627 -31 38 14.3076867   18.5 19.4 19   ~ 56 1
6 QSO B1133-681 Bla 11 36 02.09809349 -68 27 05.8223965   22.0       ~ 49 1
7 QSO B1213-172 QSO 12 15 46.75176509 -17 31 45.4031219     21.40 17.50   ~ 145 1
8 QSO B1221-829 Bla 12 24 54.38260236 -83 13 10.1020138   22.5   19.7   ~ 84 2
9 RORF 1234-504 Rad 12 37 15.28 -50 46 23.6           ~ 3 0
10 QSO B1251-713 QSO 12 54 59.92148599 -71 38 18.4366378   20.55       ~ 52 1
11 QSO B1313-333 QSO 13 16 07.98594757 -33 38 59.1726741   18.04 20.0 17.23   ~ 256 1
12 ICRF J133752.4-650924 QSO 13 37 52.44471 -65 09 24.8988   20.19       ~ 27 1
13 ICRF J144553.3-162901 BLL 14 45 53.37630149 -16 29 01.6191263   20.5   20.09   ~ 66 1
14 ICRF J155821.9-140959 Sy2 15 58 21.94812 -14 09 59.0519   19.0   12.15   ~ 74 1
15 3C 327.1 Sy1 16 04 45.4065607140 +01 17 50.317968747   20.5       ~ 135 1
16 ICRF J160734.7-333108 QSO 16 07 34.76234762 -33 31 08.9134699   20.5       ~ 37 1
17 ICRF J165039.5-294346 QSO 16 50 39.54413 -29 43 46.9548   19.01       ~ 38 1
18 ICRF J170844.6+003509 Sy2 17 08 44.64743906 +00 35 09.5151481   23.71 22.15 19.7   ~ 45 1
19 ICRF J170934.3-172853 QSO 17 09 34.34539302 -17 28 53.3650596     17.5 20.90   ~ 47 1
20 ICRF J174425.4-514443 AGN 17 44 25.45488279 -51 44 43.7403710     20.2     ~ 94 2
21 RORF 1813-241 Rad 18 16 49.7 -24 05 59           ~ 2 0
22 ICRF J181945.3-552120 QSO 18 19 45.39951531 -55 21 20.7453837   19.19 16.0 21.50   ~ 68 1
23 QSO B1908-202 QSO 19 11 09.65289294 -20 06 55.1090664   18.21   18.14   ~ 288 1
24 QSO B1925-610 QSO 19 30 06.16008387 -60 56 09.1841871   20.57   19.86   ~ 61 1

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