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PFS group/protocluster catalogs

 

PFS survey

The next generation of massively-multiplexed optical and near-infrared spectrometer, PFS, offers an unique oppotunitue to address fundamental and important questions in cosmology, galaxy evolution and the origin of the Milky Way Galaxy. For the survey strategy, PFS selects its spectroscopic targets from deep multi-color imaging taken with HSC-SSP. Though PFS instrument has not been operating yet, HSC-SSP is almost finished.

CLAUDS and HSC-SSP group and protocluster candidate catalogs

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 Δz ≤ 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 ≤ z < 3, 3 ≤ z < 4 and z ≥ 4, respectively. Below we provide the resulting catalog containing 3D coordinates, richness, halo masses, and total group luminosities.

Shown in the following plot is the projected galaxy distribution in terms of sky coverage in the CLAUDS and HSC-SSP joint deep fields. The sky coverage are drawn from four equal-sized (∼4-6 deg2) areas: E-COSMOS, XMM-LSS, ELAIS-N1 and DEEP2-3. The galaxy number count in each bin with an area about 1.4 × 10-4 deg2 is coded with a color bar. The empty circles inside galaxies coverage correspond to the masked areas.

CLAUDS and HSC-SSP (DR2) deep fields

Readme

Galaxy catalogue

Group catalogue

Protocluster candidates catalogue

Member ID

 

redshift Galaxies Groups Ng ≥ 1 Ng ≥ 2 Ng ≥ 3 Ng ≥ 5 Ng ≥ 10
0 < z < 6 5,607,052 2,232,134 669,209 402,947 204,099 68,711
z ≥ 1 2,549,143 1,617,926 379,346 178,326 65,034 13,576
z ≥ 2 1,167,268 955,893 132,022 41,815 8,993 919
z ≥ 3 409,723 374,688 28,284 5,403 404 5
z ≥ 4 61,279 59,997 1,125 89 4 0
z ≥ 5 6,586 6,553 32 1 0 0

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.

References

An Extended Halo-based Group/Cluster Finder: Application to the DESI Legacy Imaging Surveys DR8
Yang, X., Xu, H., He, M., et al. 2021, ApJ, 909, 143

The CFHT large area U-band deep survey (CLAUDS)
Sawicki, M., Arnouts, S., Huang, J., et al. 2019, MNRAS, 489, 5202

Groups and protocluster candidates in the CLAUDS and HSC-SSP joint deep surveys
Li, Qingyang; Yang, Xiaohu; Liu, Chengze; Jing, Yipeng; He, Min; Huang, Jia-Sheng; Dai, Y. Sophia; Sawicki, Marcin; Arnouts, Stephane; Gwyn, Stephen; Moutard, Thibaud; Mo, H.J.; Wang, Kai; Katsianis, Antonios; Cui, Weiguang; Han, Jiaxin; Chiu, I-Non; Gu, Yizhou; Xu, Haojie,

Comments to:  xyang@sjtu.edu.cn, qingyli@sjtu.edu.cn