2005A&A...437.1135C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.04CET20:51:47

2005A&A...437.1135C - Astronomy and Astrophysics, volume 437, 1135-1146 (2005/7-3)

Near-infrared astrometry and photometry of Southern ICRF quasars.

CAMARGO J.I.B., DAIGNE G., DUCOURANT C. and CHARLOT P.

Abstract (from CDS):

We present high quality astrometry, along with J, H, and Ks photometry, for 30 southern ICRF quasars observed with the ESO NTT/SOFI at La Silla. Our main purpose is to document the optical counterpart of ICRF quasars, by reporting their position in a stellar reference frame and their near-infrared photometry. Our investigation lies within the scope of extending the (radio) extragalactic reference frame into the optical range. An internal precision generally better than 10mas was obtained in positioning the near-infrared counterpart of these quasars within their stellar surroundings. The actual astrometric accuracy is estimated from the departure between the observed and the radio (VLBI) positions of quasars, and is about 35mas, mainly due to the statistical uncertainties of the stellar reference catalogue (UCAC2). The positional accuracy was improved to 25mas for a subset of 14 quasars observed with extended fields of view, as obtained from mosaics of overlapping images. The 3-band photometry was achieved with a precision most often better than 0.04mag, based on calibration with the 2MASS magnitudes. A spectral index α (Fν∝να) was derived from the observed quasar fluxes in the near-infrared. With a mean value <α≥-1, this spectral index does not show any significant correlation with the radio spectral index.

Abstract Copyright:

Journal keyword(s): astrometry - infrared: general - methods: numerical - reference systems

VizieR on-line data: <Available at CDS (J/A+A/437/1135): position.dat table2.dat table3.dat table4.dat>

CDS comments: Table 2 : objects ICRF are IERS B

Simbad objects: 30

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Number of rows : 30

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 QSO J0311-7651 BLL 03 11 55.2500768688 -76 51 50.846014733 15.27 16.09 16.10 15.33   ~ 210 1
2 QSO B0431-512 QSO 04 32 21.1790279259 -51 09 25.180337636     18 17.3   ~ 51 1
3 QSO B0511-220 QSO 05 13 49.1143160 -21 59 16.091337   19.95 19.5 19.58   ~ 95 1
4 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 738 2
5 ICRF J052930.0-724528 QSO 05 29 30.04217690 -72 45 28.5072742   19.61   17.895   ~ 81 1
6 QSO B0528-2505 QSO 05 30 07.96279681 -25 03 29.8994010   18.17 17.34 17.7   ~ 406 0
7 QSO B0537-286 QSO 05 39 54.28147645 -28 39 55.9478122   19.70 20.0 18.789   ~ 250 1
8 ICRF J061635.9-345616 PaG 06 16 35.9807286 -34 56 16.568415   19.98 18.0     ~ 55 1
9 QSO B0622-4411 QSO 06 23 31.7859902210 -44 13 02.541036781   17.15 16.93     ~ 59 1
10 QSO B0629-418 QSO 06 31 11.99803381 -41 54 26.9465039   18.78 19.3 18.9   ~ 55 1
11 QSO J0635-7516 QSO 06 35 46.5080299 -75 16 16.815501   15.96 15.75 15.82   ~ 521 1
12 QSO B0646-306 QSO 06 48 14.09647071 -30 44 19.6596827   19.53 20.4 18.75   ~ 89 1
13 [VV2006] J070134.6-463436 QSO 07 01 34.5454295555 -46 34 36.626145667   18.82 19.5 19.44   ~ 63 1
14 QSO J0743-6726 QSO 07 43 31.61163970 -67 26 25.5464081   16.71 16.37     ~ 139 1
15 ICRF J081108.8-492943 QSO 08 11 08.80318 -49 29 43.5101   21.57       ~ 26 1
16 ICRF J082526.8-501038 QSO 08 25 26.86900 -50 10 38.4877   20.94       ~ 110 1
17 QSO B0823-223 BLL 08 26 01.57293454 -22 30 27.2032544   16.11 16.20     ~ 188 1
18 QSO B0834-201 QSO 08 36 39.21525294 -20 16 59.5040953   19.45 19.4 18.76   ~ 176 1
19 ICRF J084127.0-754027 Sy1 08 41 27.0352023464 -75 40 27.874557775   18.03 18.9     ~ 56 1
20 QSO B0919-260 QSO 09 21 29.3546683923 -26 18 43.380586532   18.46 18.41 18.01   ~ 124 1
21 QSO B0920-397 QSO 09 22 46.41826064 -39 59 35.0683561   18.12 18.8     ~ 103 1
22 ICRF J092751.8-203451 Sy1 09 27 51.8243946391 -20 34 51.233118162   16.59 16.40 16.00   ~ 144 1
23 QSO J1051-3138 QSO 10 51 04.77752781 -31 38 14.3074730   18.5 19.4 19   ~ 52 1
24 CTS 10 Sy1 11 03 31.5267293120 -32 51 16.692763487   16.29 16.30 16.4   ~ 107 1
25 MRC 1101-536 BLL 11 03 52.22167 -53 57 00.6964   18.30 17.9     ~ 66 1
26 QSO B1104-445 QSO 11 07 08.6939954176 -44 49 07.617187122   17.84 18.2 17.37   ~ 198 1
27 QSO B1105-680 QSO 11 07 12.6945911742 -68 20 50.723538693   18.47 18.4     ~ 46 1
28 QSO B1116-462 QSO 11 18 26.9571887658 -46 34 15.003704198   17.54 17.00     ~ 115 1
29 ICRF J113143.2-581853 QSO 11 31 43.2885173823 -58 18 53.444244302   19.06       ~ 19 0
30 QSO B1144-3755 BLL 11 47 01.37070177 -38 12 11.0234199   19.03 16.2 16.72   ~ 270 1

    Equat.    Gal    SGal    Ecl

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2021.03.04-20:51:47

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