A team of researchers from the Institute of Astrophysics and Science from Spain has found interesting information regarding a spherical compound in the spiral galaxies. It is called the bulge and it is present as well in our galaxy. The results offer insight in the formation of the universe and were published in the Astronomy and Astrophysics journal.
The study was complete only after a couple of years of analysis utilizing top-of-the-line technology. The research is composed of 500.000 spectra which comprises any morphologic spiral galaxies that is known until now. The first measurements were characterized by the age of the stars present in the bulge. The primary focus of this analysis is to determine how the age can influence the inner working of the galaxy such as the presence of active galactic nuclei, or the mass of the present stars.
Therefore, the researchers discovered that in the case of massive spiral galaxies the total mass in the center of the galaxy is older as going further to the edges of the bulge. What is even more intriguing is that the opposite happens for the less massive galaxies. Consequently, the astrophysicists assume that both types of galaxies were formed in the same manner. The difference is stated in the fact that high-mass galaxies pass the formation stages easier than the low-mass galaxies.
These measurements are the key factors to calculate the estimated impact of active galactic nuclei on the bulge. To understand the evolution of supermassive black holes it is essential to determine the particularities of the bulge formation.
The fine detail brought by these studies are bringing humanity one step closer to determining the formation and evolution of the Universe. The researchers are aiming to install state-of-the-art equipment with a powerful spectrograph, named MOONS, to facilitate their future studies.