Abstract The Sloan Extension for Galactic Understanding and Exploration 2 (SEGUE-2)
obtained 128,288 low-resolution spectra (R∼ 1800) of 118,958 unique stars in the first year …

Context. The mass and spin of massive black holes (BHs) at the centre of galaxies evolve
due to gas accretion and mergers with other BHs. Besides affecting the evolution of …

The orbits of the least chemically enriched stars open a window on the formation of our
Galaxy when it was still in its infancy. The common picture is that these low-metallicity stars …

Observations of 170 local (z≲ 0.08) galaxy clusters in the northern hemisphere have been
obtained with the Wendelstein Telescope Wide Field Imager (WWFI). We correct for …

We explore the galaxy–galaxy merger rate with the empirical model for galaxy formation,
emerge. On average, we find that between 2 per cent and 20 per cent of massive galaxies …

Tidal features provide signatures of recent mergers and offer a unique insight into the
assembly history of galaxies. The Vera C. Rubin Observatory's Legacy Survey of Space and …

Metal-poor stars are important tools for tracing the early history of the Milky Way, and for
learning about the first generations of stars. Simulations suggest that the oldest metal-poor …

Context. The identification and characterization of low surface brightness (LSB) stellar
structures around galaxies such as tidal debris of ongoing or past collisions is essential to …

Several detailed observations, such as those carried out at the Canada-France-Hawaii
Telescope (CFHT), have revealed prominent Low Surface Brightness (LSB) fine structures …

Stellar halos in early-type galaxies (ETGs) are shaped by their accretion and merger
histories. We use a sample of 1114 ETGs in the TNG100 simulation of the IllustrisTNG suite …