Ultraviolet and optical view of galaxies in the Coma Supercluster
  The Coma supercluster (100 Mpc) offers an unprecedented contiguous range of
environments in the nearby Universe. In this paper we present a catalogue of
spectroscopically confirmed galaxies in the Coma supercluster detected in the
ultraviolet (UV) wavebands. We use the arsenal of UV and optical data for
galaxies in the Coma supercluster covering ~ 500 square degrees on the sky to
study their photometric and spectroscopic properties as a function of
environment at various scales. We identify the different components of the
cosmic-web: large-scale filaments and voids using Discrete Persistent
Structures Extractor, and groups and clusters using Hierarchical Density-based
spatial clustering of applications with noise, respectively. We find that in
the Coma supercluster the median emission in Halpha inclines, while the g-r and
FUV-NUV colours of galaxies become bluer moving further away from the spine of
the filaments out to a radius of around 1 Mpc. On the other hand, an opposite
trend is observed as the distance between the galaxy and centre of the nearest
cluster or group decreases. Our analysis supports the hypothesis that
properties of galaxies are not just defined by its stellar mass and large-scale
density, but also by the environmental processes resulting due to the
intrafilament medium whose role in accelerating galaxy transformations needs to
be investigated thoroughly using multi-wavelength data.
