Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf...51c&link_type=abstract
SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present high quality astrometry, along with J, H and Ks photometry, for 30 southern ICRF quasars with 11.5 < Ks < 17.5, observed with the ESO NTT/SOFI at la Silla. Internal precisions of the magnitudes in the three photometric filters are better than 0.04 mags, and spectral indices of the observed quasars have been derived. To attenuate statistical errors from the reference catalogue (UCAC2) within the astrometric tasks, mosaics of overlapping images around the positions of fourteen quasars were observed. The rms of the positional differences Radio (VLBI) minus Observations of the quasars, as obtained from the treatment of these mosaics, is better than 30 mas. Corrections for the field distortion pattern were previously applied. Internal positional precisions, to measurements near the centre of the image, are better than 10 mas. One of the objectives of this ongoing project is to provide a selection of candidates to the optical/near-IR extension of the ICRF.
Camargo I. B. J.
Charlot Patrick
Daigne Gerard
Ducourant Ch.
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