CAVITY, Calar Alto Void Integral-field Treasury Survey and Project Extension

We have learnt in the last decades that the majority of galaxies belong tohigh density regions interconnected in a sponge-like fashion. This large-scalestructure is characterised by clusters, filaments, walls, where most galaxiesconcentrate, but also under-dense regions, called voids. The void regions andthe galaxies within represent an ideal place for the study of galaxy formationand evolution as they are largely unaffected by the complex physical processesthat transform galaxies in high-density environments. These void galaxies canhold the key as well to answer current challenges to the ΛCDM paradigm.The Calar Alto Void Integral-field Treasury surveY (CAVITY) is a Legacy projectapproved by the Calar Alto Observatory to obtain spatially resolvedspectroscopic information of ∼300 void galaxies in the Local Universe(0.005 < z < 0.050) covering from -17.0 to -21.5 in r band absolutemagnitude. It officially started in January 2021 and has been awarded 110useful dark observing nights at the 3.5 m telescope using the PMASspectrograph. Complementary follow-up projects including deep optical imaging,integrated, as well as resolved CO data, and integrated HI spectra, have jointthe PMAS observations and naturally complete the scientific aim ofcharacterising galaxies in cosmic voids. The extension data has beendenominated CAVITY+. The data will be available to the whole community indifferent data releases, the first of which is planned for July 2024, and itwill provide the community with PMAS data cubes for around 100 void galaxiesthrough a user friendly, and well documented, database platform. We presenthere the survey, sample selection, data reduction, quality control schemes,science goals, and some examples of the scientific power of the CAVITY andCAVITY+ data.