Author/s: Esteban, C., Fang, X., García-Rojas, J., Toribio San Cipriano, L.
Reference: 2017 MNRAS 471 987 | Link
Using the OSIRIS spectrograph attached to the Gran Telescopio CANARIAS (GTC), it has been possible to determine -for the first time- the temperature and oxygen abundance of several nebulae (HII regions) located in the outer zones of the disc of the Milky Way. The results show that the radial distribution of the amount of oxygen does not show a flattening in this zone, something that was not clear and that several previous studies suggested. The observed behavior indicates that the mechanisms that produce the star formation and the chemical evolution of the gas are similar along the disc of the Galaxy and discard the existence of exotic phenomena in the outer zones. The results imply that the most accepted models for the formation and evolution of the Milky Way, such as the so-called inside-out models, can be applied to at least most of the Galactic disk.