2.Data used and reduction procedures
Due to the unavailability of all the required data in one general catalogue for the present study, we have compiled data from dif- ferent sources.
We have taken photometric data from 2MASS cata- logue ( Cutri et al., 2003 ).
2MASS uniformly scanned the entire sky in three near-infrared bands ( J , H , K s ) to detect and characterize point sources brighter than 1 mJy in each band, with signal-to- noise ratio (SNR) greater than 10, using a pixel size of 2 .0.