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Gallego Cano, Eulalia Instituto de Astrofísica e Ciências do Espaço Unveiling young stars near the supermassive black hole at the centre of our Galaxy. The presence of young massive stars near the Galactic Centre (GC) is puzzling because star formation is expected to be suppressed in the vicinity of a massive black hole. Due to observational challenges such as extreme extinction and crowding, our understanding of the stellar population around the massive black hole Sagittarius A* (Sgr A*) remains limited, with spectroscopic data available only for selected small and comparably bright sources. In a recent study, we aimed to enhance our understanding by using intermediate band imaging and meticulous data reduction techniques. Our analysis revealed a top-heavy initial mass function (IMF) for young stars near Sgr A*, indicating distinct star formation mechanisms at play in this region, possibly involving a disc around Sgr A*. This contrasts with the outer region (R>9’’), where a Salpeter/Kroupa IMF adequately accounts for the observed data. Furthermore, we are currently working on a new study aimed at identifying and characterising young O- and B-type stars within an area that has not been as extensively studied as the inner parsec (~3pc from SgrA*). This study employs a methodology similar to our previous research, ensuring consistency in our approach and facilitating comparison across different radial distances from the black hole. These photometric studies offer a significant advantage in detecting fainter stars within larger fields compared to spectroscopic studies. However, to validate the nature of these candidates, subsequent in-depth spectroscopic follow-up observations are essential. To this end, we are preparing a proposal to ESO to conduct spectroscopic analyses of our identified young stellar candidates for validation. In conclusion, our findings will provide valuable insights into how young massive stars form near Sagittarius A*, offering new perspectives on the formation history of the nuclear stellar cluster.
García Benito, Rubén National Astronomical Observatories (Beijing) 2. ACCRETION, STAR FORMATION, AND ENVIRONMENT AS DRIVERS OF GALAXY EVOLUTION, AND THEIR COSMOLOGICAL CONTEXT
Gómez Rivero, José Francisco Observatoire de la Côte D'Azur, Nice, France Searching for comet collisions on exoplanets with water maser observations at radio wavelengths
García Benito, Rubén National Astronomical Observatories (Beijing) 2. ACCRETION, STAR FORMATION, AND ENVIRONMENT AS DRIVERS OF GALAXY EVOLUTION, AND THEIR COSMOLOGICAL CONTEXT
Vílchez Medina, José Manuel Universidad de La Serena The nature of the galaxies that ionized the nearly metal free interstellar and intergalactic gas in the early Universe. Extreme emission line galaxies, as local analogs of the first galaxies: Interstellar medium metallicity and properties of the extremely hard ionizing sources.