Low X-Ray Luminosity Galaxy Clusters: Main Goals, Sample Selection, Photometric and Spectroscopic Observations

Abstract

We present our study of 19 low X-ray luminosity galaxy clusters (LX 0.5-45×10 43 erg s −1 ), selected from the ROSAT Position Sensitive Proportional Counters Pointed Observations and the revised version of Mullis et al. in the redshift range of 0.16-0.7. This is the introductory paper of a series presenting the sample selection, photometric and spectroscopic observations, and data reduction. Photometric data in different passbands were taken for eight galaxy clusters at Las Campanas Observatory; three clusters at Cerro Tololo Interamerican Observatory; and eight clusters at the Gemini Observatory. Spectroscopic data were collected for only four galaxy clusters using Gemini telescopes. Using the photometry, the galaxies were defined based on the star-galaxy separation taking into account photometric parameters. For each galaxy cluster, the catalogs contain the pointspread function and aperture magnitudes of galaxies within the 90% completeness limit. They are used together with structural parameters to study the galaxy morphology and to estimate photometric redshifts. With the spectroscopy, the derived galaxy velocity dispersion of our clusters ranged from 507 km s −1 for [VMF98]022 to 775 km s −1 for [VMF98]097 with signs of substructure. Cluster membership has been extensively discussed taking into account spectroscopic and photometric redshift estimates. In this sense, members are the galaxies within a projected radius of 0.75 Mpc from the X-ray emission peak and with clustercentric velocities smaller than the cluster velocity dispersion or 6000 km s −1 , respectively. These results will be used in forthcoming papers to study, among the main topics, the red cluster sequence, blue cloud and green populations, the galaxy luminosity function, and cluster dynamics.

Low X-Ray Luminosity Galaxy Clusters. IV. SDSS galaxy clusters at z < 0.2

“…We intend to contribute to galaxy formation and evolution studying a sample of low X-ray luminosity galaxy clusters at intermediate redshifts. The main goals of the project and the galaxy cluster sample is described in Nilo Castellón et al (2016). We have been interested mainly in the cluster galaxy populations and the assignment of the cluster membership at redshift range 0.16 < z < 0.7.…”