The density maps of the HS47.5-22 field

We study the reconstruction of overdensity maps of galaxies as function of redshift in the range 0 < z < 0.8 using data from 1-m Schmidt Telescope of Byurakan Astrophysical Observatory (Armenia) in 16 medium band (∼ 250 Å) and four broad band (u,g,r,i) filters. The data used in this work homogeneously cover 2.39 sq. deg with accurate photometric redshifts, down to R < 23 mag (AB). We reconstructed the density contrast maps for the whole galaxy sample of the HS 47.5-22 ROSAT field in narrow slices for full range of redshifts. We select groups and clusters of galaxies with adaptive kernel based on density peaks which are larger than two times the mean density. The reconstructed overdensity field of galaxies consists of cluster-like structures outlining void-like regions for full redshift range 0 ≤ z ≤ 0.8. We detect known galaxy clusters in this field with software specially developed for this project. This gives us a possibility to study how star formation properties and galaxy morphology depend on the environments of the galaxies in this field.