Baryon content of massive galaxy clusters at 0.57 < z < 1.33

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: Chiu, I., Mohr, J., McDonald, M., Bocquet, S., Ashby, M. L. N., Bayliss, M., Benson, B. A., Bleem, L. E., Brodwin, M., Desai, S., Dietrich, J. P., Forman, W. R., Gangkofner, C., Gonzalez, A. H., Henning, C., Lui, J., Reichardt, C. L., Saro, A., Stalder, B., Stanford, S. A., Song, J., Schrabback, T., Suhada, R., Strazzullo, V., Zenteno, A.
• Language: unknown
• Published: 2022
• Subjects: 79 ASTRONOMY AND ASTROPHYSICS; South Pole; South pole
• Online Access: http://www.osti.gov/servlets/purl/1247532; https://www.osti.gov/biblio/1247532; https://doi.org/10.1093/mnras/stv2303

Here, we study the stellar, Brightest Cluster Galaxy (BCG) and intracluster medium (ICM) masses of 14 South Pole Telescope (SPT) selected galaxy clusters with median redshift z = 0.9 and median mass M 500 = 6 x 10 14 M ⊙ . We estimate stellar masses for each cluster and BCG using six photometric bands spanning the range from the ultraviolet to the near-infrared observed with the VLT, HST and Spitzer. The ICM masses are derived from Chandra and XMM-Newton X-ray observations, and the virial masses are derived from the SPT Sunyaev-Zel'dovich Effect signature. At z = 0.9 the BCG mass M * BCG constitutes 0.12 ± 0.01% of the halo mass for a 6 x 10 14 M ⊙ cluster, and this fraction falls as M 500 -0.58±0.007 . The cluster stellar mass function has a characteristic mass M 0 = 10 11.0±0.1 M ⊙ , and the number of galaxies per unit mass in clusters is larger than in the field by a factor 1.65 ± 0.2. Both results are consistent with measurements on group scales and at lower redshift.