eBook - ePub

Galaxies

Name: Galaxies
Author: Francoise Combes

Formation and Evolution

Francoise Combes,

English
ePUB (mobile friendly)
Available on iOS & Android

eBook - ePub

Galaxies

Formation and Evolution

Francoise Combes,

About this book

Galaxies are vast ensembles of stars, gas and dust, embedded in dark matter halos. They are the basic building blocks of the Universe, gathered in groups, clusters and super-clusters. They exist in many forms, either as spheroids or disks. Classifications, such as the Hubble sequence (based on mass concentration and gas fraction) and the colormagnitude diagram (which separates a blue cloud from a red sequence) help to understand their formation and evolution. Galaxies spend a large part of their lives in the blue cloud, forming stars as spiral or dwarf galaxies. Then, via a mechanism that is still unclear, they stop forming stars and quietly end in the red sequence, as spheroids. This transformation may be due to galaxy interactions, or because of the feedback of active nuclei, through the energy released by their central super-massive black holes. These mechanisms could explain the history of cosmic star formation, the rate of which was far greater in the first half of the Universes life.

Galaxies delves into all of these surrounding subjects in six chapters written by dedicated, specialist astronomers and researchers in the field, from their numerical simulations to their evolutions.

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Yes, you can access Galaxies by Francoise Combes in PDF and/or ePUB format, as well as other popular books in Physical Sciences & Space Science. We have over one million books available in our catalogue for you to explore.