Speaker
Description
In this study, we explored the impact of isolated and group environments on stellar mass, star formation rate (SFR), and specific star formation rate (SSFR) using the catalogue of group and cluster extracted from the Sloan Digital Sky Survey Data Release 12 (SDSS DR12) for $0.02\leq z\leq0.2$. To mitigate the Malmquist bias, we partitioned the entire dataset into eighteen subsamples with a redshift bin size of $\Delta z = 0.01$ and examined the environmental dependencies of these properties within each redshift bin. A strong correlation between environment, stellar mass, SFR, and SSFR was observed across nearly all redshift bins, whereby the relation is much stronger at lower redshift than higher redshift. The proportional of isolated and group galaxies within the bins was observed to vary with redshift, where in the lower redshift bins $(z \lesssim 0.1)$, the proportion of galaxies within the group environment exceeded that within the isolated environment. On the other hand, in the higher redshift bins $(z\gtrsim 0.12)$, the isolated environment's galaxy fraction was found to be higher than that of the group environment. For the intermediate redshift bins $(0.1 \lesssim z \lesssim 0.12)$, an approximately equal proportion of galaxies was observed in both isolated and group environments.
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