VLBI measurement of the secular aberration drift

@article{Titov2011VLBIMO,
  title={VLBI measurement of the secular aberration drift},
  author={O. Titov and S{\'e}bastien B. Lambert and A. M. Gontier},
  journal={Astronomy and Astrophysics},
  year={2011},
  volume={529}
}
Aims. While analyzing decades of very long baseline interferometry (VLBI) data, we detected the secular aberration drift of the extragalatic radio source proper motions caused by the rotation of the Solar System barycenter around the Galactic center. Our results agree with the predicted estimate to be 4–6 micro arcseconds per year (μas/yr) towards α = 266 ◦ and δ = −29 ◦ . In addition, we tried to detect the quadrupole systematics of the velocity field. Methods. The analysis method consisted of… 

Figures and Tables from this paper

The Secular Aberration Drift and Future Challenges for VLBI Astrometry

The centrifugial acceleration of the Solar system, resulting from the gravitational attraction of the Galaxy centre, causes a phenomenon known as 'secular aberrration drift'. This acceleration of the

Direct estimation of the Solar acceleration using geodetic/astrometric VLBI observations

The secular aberration drift observed as the apparent proper motion of extragalactic radio sources is caused by the acceleration of the coordinate origin, the Solar System barycenter. So, the

Galactocentric acceleration in VLBI analysis

Aims. The IVS Working Group on Galactic Aberration (WG8) was established to investigate issues related to incorporating the effect of Galactic aberration in IVS analysis. The circular motion of the

The solar acceleration obtained by VLBI observations

Aims. The three-dimensional acceleration vector of the solar system barycenter was estimated from VLBI delay observations. We also provide a first physical explanation for this acceleration vector.

VLBI: A fascinating technique for geodesy and astrometry

Probing the Properties of Gaia-CRF2 Quasars at the Faintest Magnitudes

Gaia data release 2 (DR2) provides the best non-rotating optical frame aligned with the radio frame (ICRF) thanks to the inclusion of about half-million quasars in the five-parameter astrometric

Absolute kinematics of radio-source components in the complete S5 polar cap sample. IV. Proper motions of the radio cores over a decade and spectral properties

We have carried out a high-precision astrometric analysis of two very-long-baseline-interferometry (VLBI) epochs of observation of the 13 extragalactic radio sources in the complete S5 polar cap

Cosmology with extragalactic proper motions: harmonic formalism, estimators, and forecasts

  • A. Hall
  • Physics
    Monthly Notices of the Royal Astronomical Society
  • 2019
We conduct a thorough study into the feasibility of measuring large-scale correlated proper motions of galaxies with astrometric surveys. We introduce a harmonic formalism for analysing proper

The Effect of Galactic Aberration on the CRF

TLDR
It is shown that the deformation of a CRF estimated with the whole set of VLBI observations can be described by a systematic dipole displacement with an amplitude of about 35 μas.
...

References

SHOWING 1-10 OF 34 REFERENCES

Astrometric Effects of Secular Aberration

One of the main endeavors of fundamental astrometry is to establish a practical realization of a nonrotating, inertial reference frame anchored to celestial objects whose positions are defined in the

Aberration in proper motions

Approved space astrometric missions (SIM, GAIA) are aiming at a few microarcseconds per year precision in yearly proper motions and even less than a microarcsecond in the definition of an

Astrometry and geodesy with radio interferometry: experiments, models, results

Interferometry at radio frequencies between Earth-based receivers separated by intercontinental distances has made significant contributions to astrometry and geophysics during the past three

TRIGONOMETRIC PARALLAXES OF MASSIVE STAR-FORMING REGIONS. VI. GALACTIC STRUCTURE, FUNDAMENTAL PARAMETERS, AND NONCIRCULAR MOTIONS

We are using the Very Long Baseline Array and the Japanese VLBI Exploration of Radio Astronomy project to measure trigonometric parallaxes and proper motions of masers found in high-mass star-forming

VLBA Observations of Radio Reference Frame Sources. III. Astrometric Suitability of an Additional 225 Sources

We present simultaneous dual-frequency Very Long Baseline Array 2 and 8 GHz observations of 225 of the 560 extragalactic sources for which positions were reported by Johnston and coworkers and which

Dipole Anisotropy in the COBE Differential Microwave Radiometers First-Year Sky Maps

We present a determination of the cosmic microwave background dipole amplitude and direction from the COBE Differential Microwave Radiometers (DMR) first year of data. Data from the six DMR channels

Determination of the red shifts of selected IVS program objects. I

The spectroscopic red shifts of seven optical objects whose coordinates coincide with those of radio sources in the IVS (International VLBI Service for Geodesy and Astrometry) program list are

Stability of the extragalactic VLBI reference frame

The qualication and the maintenance of the International Celestial Reference Frame (ICRF) source directions are currently based on global statistics regarding the complete data set of VLBI

Effect of asymmetry of the radio source distribution on the apparent proper motion kinematic analysis

Context. Information on physical characteristics of astrometric radio sources, such as magnitude and redshift, is of great importance for many astronomical studies. However, data usually used in

Radio-source structure in astrometric and geodetic very long baseline interferometry

An algorithm to calculate source structure corrections for bandwidth synthesis delays and delay rates is used to refer the position of extragalacitc radio sources to a specific feature of each