2011A&A...529A..70L


Query : 2011A&A...529A..70L

2011A&A...529A..70L - Astronomy and Astrophysics, volume 529A, 70-70 (2011/5-1)

Improved determination of γ by VLBI.

LAMBERT S.B. and LE PONCIN-LAFITTE C.

Abstract (from CDS):

This study revisits the estimate of the post-Newtonian relativistic parameter γ reported previously. We use (i) improved geophysical and astronomical modeling in the analysis software package, and (ii) a higher number of observations, a large part of which come from a relatively small number of VLBA experiments at 8 GHz. We analyzed more than seven million group delays measured by very long baseline interferometry between August 1979 and August 2010. The parameter γ was least squares fitted to delays as a global parameter over the entire observational time period. The most complete solution of this study yielded γ=0.99992±0.00012, whereas it was 0.99984±0.00015 in our 2009 paper. The item (i), which is recognized as important for geodesy and reference frame realization, provides estimates of |γ-1| that are smaller than 10–4. As expected, the formal error in γ decreases when additional sessions are processed. In particular, we demonstrate that the inclusion of more than 1.7 million observations from the VLBA (mainly from the RDV and VLBA calibrator survey experiments) in the analysis decreases the formal error in the estimate of γ by about 15% with respect to our previous determination.

Abstract Copyright:

Journal keyword(s): astrometry - techniques: interferometric - gravitation

Simbad objects: 5

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Number of rows : 5
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 RORF 0218+35A LeI 02 21 05.4667 +35 56 13.730           ~ 34 0
2 6C 021803+354230 BLL 02 21 05.4920852208 +35 56 13.848581904   20.0 20.0 19.60   ~ 559 3
3 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5797 1
4 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3040 2
5 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 671 1

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