We investigate the accuracy of the perturbative galaxy bias expansion in view of the forthcoming analysis of the Euclid spectroscopic galaxy samples. We compare the performance of a Eulerian galaxy bias expansion using state-of-the-art prescriptions from the effective field theory of large-scale structure (EFTofLSS) with a hybrid approach based on

The European Solar Telescope (EST) aims to significantly improve our capabilities to observe the solar chromosphere and understanding the solar chromosphere represents one of the most challenging tasks in solar physics. EST incorporates the most innovative technology, with a simple and efficient design, and the most advanced instrumentation to

Spiral arms, as those of our own Milky Way, are some of the most spectacular features in disc galaxies. It has been argued that star formation should proceed more efficiently in spiral arms as a result of gas compression. Yet, observational studies have so far yielded contradictory results. Here, we examine arm/interarm surface density contrasts at

Some ultra-diffuse galaxies (UDGs) are known to host very large globular cluster (GC) systems, clearly exceeding the expectations for galaxies with such low stellar mass and density and thereby challenging our understanding of star cluster formation and its connection to galaxy evolution. As bright point-sources, GCs in UDGs have been used as

Context: JWST has recently detected numerous disc galaxies at high-redshifts and there have been observations of cold disc galaxies at z > 4 with ALMA. In the Milky Way, recent studies highlight the presence of metal-poor stars in cold disc orbits, suggesting an ancient disc. This prompts a fundamental question: When did the Milky Way disc form

EMIR was shipped to the GTC on May 2016 and had its first light on June 2016. Since the beginning, the EMIR performances have been severely hampered by the many instabilities in the infrared detector, a 2048x2048 Hawaii2, built with the old original technology of the Teledyne Hawaii series. Despite of this, the instrument has proven to be powerful