Mysteries of the Cosmos
關於這本有聲書
Spheroidal galaxies produce incredibly challenging questions regarding our modelling of the cosmos development process. Our problem is heightened because elliptical galaxies grew far away and long ago. As a result, the data that can reveal their arrangement is obscure. Nevertheless, there are mild relations between measured characteristics of the galaxies that comprise hidden aspects. One such relationship is the central plane of elliptical galaxies. This plane combines three measured amounts the size, the expanse and velocities of the stars, and the mass of all the stars in the galaxy. A plot of those three measures and three dimensions reveals that they rest on a two-dimensional plane, indicating they are connected.
Furthermore, how this came about is a puzzle. What is certain is that elliptical galaxies, as observed today, are very gently growing and evolving systems. Any association in their characteristics must have been marked at birth. Galaxies now are very gradually developing systems. These mounting relations must have been marked long ago when the galaxies constituted. The associations provide observational restrictions on how the stellar mass was compiled. We would sincerely like to differentiate our snapshots of the past inferred from the scaling relations with development models. However, unlike disc galaxies, we have no underlying hypothesis of spheroidal galaxy uncertainty and star configuration. Instead, there are phenomenological ideas that propose the notion that consolidations control the gas reservoir for creating stars. Consolidations without gas are called dry consolidations. A consolidation with gas is wet. A wet consolidation involves star development and leads to multiple alterations in morphology. Modelling consolidations tells us that dry or dryish significant consolidations indeed performed a vital role at a redshift of one or two in valuing for the morphological properties of huge ellipticals.
