Extended stellar Counter-Rotation in Disk Galaxies

Studying stellar counter-rotation disks can provide valuable insights into the formation, evolutionary history of these galaxies. Aims, search the present day literature with idea of building a data base of all stellar counter-rotation disk galaxies, and we selected the best studied case with the age of two components from SDSS-IV MaNGA ID survey for the most of them are S0 type galaxies to understand why some galaxies have stellar counter-rotating disks and update the plot, and the differentiate between the ages of young and old components of stars in the counter-rotating disk and the overall galaxy. This can help classify the evolutionary stage of the counter-rotating structures. Methods, we have presented a summary of general information related to stellar counter-rotating disks. Specifically, our attention has been directed towards the analysis of 18 galaxies selected for their distinctive dual stellar counter-rotating disks, as found in existing literature. The data utilized for this investigation was also extracted from literary sources, where we compiled a table containing data for all 18 galaxies. Furthermore, we create three graphical plots: the first one illustrates the correlation between age and metallicity, while the second one portrays the relationship between metallicity and all 18 galaxies, along with the correlation between the luminosity fraction for each galaxy in its counter-rotating disk and their metallicities. The third plot represents the relationship between the age of the two components and all 18 galaxies, with the data sorted based on the age of the secondary component. Results, the most of the secondary disk is younger than the primary disk except for the M 136248 galaxy, the scenario varies in all other cases. The metallicity range of the counter-rotating disk is narrower compared to the primary disk for all 18 galaxies, and it is independent of the metallicity in the primary disk. Data indicated the higher metallicity in stellar counter-rotating disks are the ones of represent a small fraction of whole galaxy. Analyzing the metallicity and luminosity fraction of counter-rotating disks in stellar systems provides insights into their formation and eventual destiny.