Details

Autor(en) / Beteiligte

• Fey, A. L.
• Gordon, D.
• Jacobs, C. S.
• Ma, C.
• Gaume, R. A.
• Arias, E. F.
• Bianco, G.
• Boboltz, D. A.
• Böckmann, S.
• Bolotin, S.
• Charlot, P.
• Collioud, A.
• Engelhardt, G.
• Gipson, J.
• Gontier, A.-M.
• Heinkelmann, R.
• Kurdubov, S.
• Lambert, S.
• Lytvyn, S.
• MacMillan, D. S.
• Malkin, Z.
• Nothnagel, A.
• Ojha, R.
• Skurikhina, E.
• Sokolova, J.
• Souchay, J.
• Sovers, O. J.
• Tesmer, V.
• Titov, O.
• Wang, G.
• Zharov, V.

Titel

THE SECOND REALIZATION OF THE INTERNATIONAL CELESTIAL REFERENCE FRAME BY VERY LONG BASELINE INTERFEROMETRY

Ist Teil von

• The Astronomical journal, 2015-08, Vol.150 (2), p.1-16

Ort / Verlag

The American Astronomical Society

Erscheinungsjahr

2015

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• ABSTRACT We present the second realization of the International Celestial Reference Frame (ICRF2) at radio wavelengths using nearly 30 years of Very Long Baseline Interferometry observations. ICRF2 contains precise positions of 3414 compact radio astronomical objects and has a positional noise floor of ∼40 as and a directional stability of the frame axes of ∼10 as. A set of 295 new "defining" sources was selected on the basis of positional stability and the lack of extensive intrinsic source structure. The positional stability of these 295 defining sources and their more uniform sky distribution eliminates the two greatest weaknesses of the first realization of the International Celestial Reference Frame (ICRF1). Alignment of ICRF2 with the International Celestial Reference System was made using 138 positionally stable sources common to both ICRF2 and ICRF1. The resulting ICRF2 was adopted by the International Astronomical Union as the new fundamental celestial reference frame, replacing ICRF1 as of 2010 January 1.