The Cosmic Web and galaxy evolution around the most luminous X-ray cluster: RX J1347.5−1145
Abstract
In this paper we study the large scale structures and their galaxy content around the most X-ray luminous cluster known, RX J1347.5-1145 at z = 0.45. We make use of u∗g′r′i′z ′ CFHT MEGACAM photometry together with VIMOS VLT spectroscopy to identify structures around the RXJ1347 on a scale of ∼20×20 Mpc2. We construct maps of the galaxy distribution and the fraction of blue galaxies. We study the pho-tometric galaxy properties as a function of environment, traced by the galaxy density. We identify group candidates based on galaxy overdensities and study their galaxy content. We also use available GALEX NUV imaging to identify strong unobscured star forming galaxies. We find that the large scale structure around RXJ1347 extends in the NE-SW direction for at least 20 Mpc, in which most of the group candidates are located, some of which show X-ray emission in archival XMM-Newton observations. As other studies, we find that the fraction of blue galaxies (Fblue) is a function of galaxy number density, but the bulk of the trend is due to galaxies belonging to mas-sive systems. The fraction of the UV-bright galaxies is also function of environment,