The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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Testing Web Feeding Model for Star Formation in Galaxy Clusters in the COSMOS Field

  • Ko, Eunhee (Astronomy program, Dept. of Physics & Astronomy, Seoul National University) ;
  • Im, Myungshin (Astronomy program, Dept. of Physics & Astronomy, Seoul National University) ;
  • Lee, Seong-Kook (Astronomy program, Dept. of Physics & Astronomy, Seoul National University) ;
  • Hyun, Minhee (Astronomy program, Dept. of Physics & Astronomy, Seoul National University)
  • Published : 2021.04.13
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Abstract

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 (σΔz/(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 correlation or anti-correlation between quiescent galaxy fraction, an indicator of star-forming activity, and the prevalence of galaxy large scale structures.

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