Mapping Diffuse Emission in Lyman UV band
  The CAFE (Census of warm-hot intergalactic medium, Accretion, and Feedback
Explorer) and LyRIC (Lyman UV Radiation from Interstellar medium and
Circum-galactic medium) have been proposed to the space agencies in China
respectively. CAFE was first proposed in 2015 as a joint scientific CAS-ESA
small space mission. LyRIC was proposed in 2019 as an independent external
payload operating on the Chinese Space Station. Both missions are dedicated to
mapping the Lyman UV emission (ionized oxygen (O VI) resonance lines at 103.2
and 103.8 nm, and Lyman series) for the diffuse sources in our Galaxy and the
circum-galactic mediums of the nearby galaxies. We present the primary science
objectives, mission concepts, the enabling technologies, as well as the current
status.
