Alignment of Radio Galaxy Axes using FIRST Catalogue
  We study the alignment of radio galaxies axes using the FIRST catalogue. we
impose several cuts in order to select the candidates which are most likely to
be free of systematic bias. In our study we primarily focus on testing for
alignment among sources within a certain angular separation from one another
since for most sources redshift information is not available. We find a very
significant effect for angular distances less than 1 degrees. The distance
scale of alignment is found to be roughly 28 Mpc, in agreement with earlier
estimates, assuming that these sources are dominantly at redshift of 0.8.
However we are not able to entirely rule out the possibility of systematic bias
in data. We also perform a full three dimensional analysis using a smaller data
sample for which redshift information is available. In this case we only find a
very weak signal at much larger distances.
