Position Angle Variation of the Major Axis of some Galaxies

The variation in the direction of the major axis in three ellipticals, five lenticulars and three spirals has been studied using B or V isophotic maps. It is noticed that there is a turn point in most of the curves especially for spirals and lenticulars. This turn point can be used to define the galaxy nucleus region. There seems to be a correlation between the rotation curve and the position angle curve especially for NGC 2784 and NGC 3640