Understanding the evolution of galaxies is something that continues to develop. There is still no definitive statement, but with each analysis new details are discovered. One of them points to his shape.
According to research, galaxies, which have a spiral shape, They once had that of a lentil. Yes, like grains.
The study was published by Alister Graham in the magazine Monthly Notices of the Royal Astronomical Society. Its title: Resequencing of the Hubble sequence and the quadratic relationship (black hole mass) – (spheroid stellar mass) for elliptical galaxies.
“Spiral galaxies, including the Milky Way, appear to be built from gas accretion and minor mergers.” in what were initially lenticular galaxies”, notes Graham, from Swinburne University of Technology in Hawthorn, in his research.
“These connections are expressed as a new morphological sequence, called ‘Triangal’, “which includes elements of the Hubble sequence and Van den Bergh’s trident,” Graham notes, “revealing the often-overlooked bridging nature of elicular galaxies.”
According to Graham’s work, galaxies are born with lenticular options, that is, shaped like a lentil. With the passage of time, they change shape, acquiring spiral ones.
When two galaxies end up merging, their black holes do too. Graham determined this after studying more than 100 galaxies: except for lenticular galaxies, Black hole mass and stellar mass tended to be linked in predictable ways.
“The findings,” says the researcher, “have implications for the feedback of active galactic nuclei, mapping morphology in simulations and predicting gravitational wave signals from colliding supermassive holes.”
Therefore, a new model of galaxy speciation is presented, key to their study.