The Determination of Structures and Locations of Clusters of Galaxies Through the Use of Statistical Techniques.
Photographic plates which are centered on the Corona Borealis cluster of galaxies, and which extend over an area of the sky somewhat larger than that which the cluster is suspected to encompass, were used to develop an alternative way to investigate clusters of galaxies. The raw data are the measured coordinates of galaxy images. Least-squares fits to theoretical models of the data are used to determine which models of the cluster-field combination best fit the data; Galaxies which have a high probability of belonging to the cluster are deleted from the region. This process is carried out for all of the clearly apparent clusters. The distribution of the remaining galaxies is then analyzed to see if there appear to be any additional clusters. If there are, these are also analyzed by the least-squares technique and then deleted. This procedure is continued until there are no more clusters apparent on the plate.
- Pub Date:
- Physics: Astronomy and Astrophysics;
- Galactic Clusters;
- Galactic Structure;
- Statistical Tests;
- Corona Borealis Constellation;
- Curve Fitting;
- Least Squares Method;
- Pattern Recognition;
- Photographic Plates;