EDP Sciences logo
Subscriber Authentication Point
Search
Menu
Home All issues Volume 494 / No 2 (February I 2009) A&A, 494 2 (2009) 799-815 Full HTML
Free Access
   

Table 9:

Determination of the astrometric accuracy of the catalogues used in the LQAC.
  Mean (mas) $\sigma$ (mas)    
  $\Delta\alpha\cos{\delta}$ $\Delta \delta$ $\Delta\alpha\cos{\delta}$ $\Delta \delta$ N1 N2
VLBA -0.010 0.039 0.767 0.585 94 4
VLA -0.054 -0.009 1.025 1.391 63 10
JVAS -3.287 -0.081 9.793 12.629 90 5
SDSS 1.210 -12.203 52.022 51.728 96 4
2QZ 86.242 45.991 193.667 181.214 98 3
FIRST -30.282 0.010 286.750 319.342 96 3
HB 97.800 100.152 726.512 785.789 85 5
VV06 30.393 286.513 582.571 586.322 97 3
N1 stands for the percentage of quasars remaining after a $3\sigma$ rejection
threshold algorithm, and N2 for the number of necessary iterations.

Source LaTeX | All tables | In the text

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.