Evidence of the impact of quasar driven outflows on recent star formation
Left panel: the young stellar population (YSP) distribution overlaid with contours showing the advancing side (blue) and receding side (red) of the outflow. Right panel: the same YSP but with contours of W80 (i.e. the width of the 5007 [OIII] line).
Stellar ages are key to several fields of astrophysics such as exoplanet research, galactic-archeology, and of course stellar physics. Obtaining the ages of stars is however not straightforward and requires stellar modeling. The most widely used technique only requires stellar colors or temperature and surface gravity, but the uncertainties are quite large. This technique is most efficient for stars belonging to clusters, as they were born from the same molecular cloud and share the same ages. In the last decades, based on the study of stellar acoustic waves, asteroseismology became the most
CaII Kgrains, i.e., intermittent, short-lived (about 1 minute), periodic (2-4 minutes), pointlike chromospheric brightenings, are considered to be the manifestations of acoustic waves propagating upward from the solar surface and developing into shocks in the chromosphere. After the simulations of Carlsson and Stein, we know that hot shocked gas moving upward interacting with the downflowing chromospheric gas (falling down after having been displaced upward by a previous shock) nicely reproduces the spectral features of the CaII K profiles observed in such grains, i.e., a narrowband emission
An international study, carried out by the James Webb Space Telescope (JWST) in which the Instituto de Astrofísica de Canarias (IAC) has participated, shows that the universe could produce extremely luminous galaxies at very early epochs, when it was only some 3% of its present age. This result implies that these galaxies formed stars before, and more quickly than predicted by current theoretical models. The study also reveals an unusual galaxy that “imitates” the emission from a very distant galaxy. The results are published in the journal Nature. During the first months of scientific