Books > Science & Mathematics > Astronomy, space & time > Galaxies, clusters, intergalactic matter
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Galaxies - Formation and Evolution (Hardcover)
Loot Price: R3,935
Discovery Miles 39 350
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Galaxies - Formation and Evolution (Hardcover)
Expected to ship within 12 - 17 working days
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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 Universe s 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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