AAS Journals
Published May 4, 2022 | Version v1.0
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Galaxy groups and protocluster candidates in the CLAUDS and HSC-SSP joint deep surveys

Creators

  • 1. Department of Astronomy, School of Physics and Astronomy, and Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, Shanghai 200240, China

Description

Using the extended halo-based group finder developed by Yang et al. 2021, which is able to deal with galaxies via spectroscopic and photometric redshifts simultaneously, we (Li et al. 2022) construct galaxy group and candidate protocluster catalogs in a wide redshift range (\(0 < z < 6\)) from the joint CFHT Large Area U-band Deep Survey (CLAUDS) and Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) deep data set. Based on a selection of 5,607,052 galaxies with i-band magnitude mi < 26 and a sky coverage of 34.41 deg2, we identify a total of 2,232,134 groups, within which 402,947 groups have at least three member galaxies. By checking the galaxy number distributions within a 5-7 h-1Mpc  projected separation and a redshift difference \(\Delta z \leq 0.1\) around those richest groups at redshift \(z > 2\), we identified a list of 761, 343 and 43 protocluster candidates in the redshift bins \(2 \leq z < 3\), \(3 \leq z < 4\) and \(z > 4\), respectively. 

 

More details can be found in our paper (arXiv: 2205.05517). Our catalogs are also shared at https://gax.sjtu.edu.cn/data/PFS.html.

Notes

As the sky area used to study the science theme Galaxy Evolution in PFS is completely overlapped by the CLAUDS and HSC-SSP data set, once PFS starts operating, we will continuously update our group catalogs using the massive spectroscopic data once they are available.

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