Publications by authors named "X Haubois"
Tight relationships exist in the local Universe between the central stellar properties of galaxies and the mass of their supermassive black hole (SMBH). These suggest that galaxies and black holes co-evolve, with the main regulation mechanism being energetic feedback from accretion onto the black hole during its quasar phase. A crucial question is how the relationship between black holes and galaxies evolves with time; a key epoch to examine this relationship is at the peaks of star formation and black hole growth 8-12 billion years ago (redshifts 1-3).
View Article and Find Full Text PDFRed supergiants are the most common final evolutionary stage of stars that have initial masses between 8 and 35 times that of the Sun. During this stage, which lasts roughly 100,000 years, red supergiants experience substantial mass loss. However, the mechanism for this mass loss is unknown.
View Article and Find Full Text PDFArticle Synopsis
- The star S2, orbiting the black hole Sagittarius A*, undergoes notable changes in gravitational potential, which researchers use to test the local position invariance (LPI) part of the Einstein equivalence principle.
- By analyzing the redshift of hydrogen and helium absorption lines in the star's spectrum during its closest approach to the black hole, the study aims to establish an upper limit on LPI violations.
- The research findings suggest that the tested gravitational potential variation is six times greater than what can be measured on Earth and ten times larger than previous experiments with white dwarfs, marking a new testing regime for the LPI.