Testing Web Feeding Model for star formation in galaxy clusters in the COSMOS field

It is yet to be understood what controls the star formation activity in high-redshift galaxy clusters. One recently proposed mechanism is that the star formation activity in galaxy clusters are fed by gas and galaxies in large-scale structures surrounding them, which we call as “Web Feeding Model”. Using galaxies in the COSMOS2015 catalog, with mass completeness at log⁡(M⁄M_⨀ )≥9.54 and reliable photometric redshift data σ_(δz⁄(1+z))≈0.01, we study the star formation activities of galaxy clusters and their surrounding environment to test the web feeding model. We first identify the overdense regions with number density exceeding the 4σ-level from photometric redshift data as galaxy clusters, and we find that they are well matched with clusters identified in the X-ray extended source catalog. Furthermore, we identify galaxy large scale structures and will present the anti-correlation between quiescent galaxy fraction, an indicator of star-forming activity, and the prevalence of galaxy large scale structures.