Galaxy evolution

Ebook "On the formation of the most massive stars in the galaxy" presents results of Submillimeter Array (SMA) and Very Large Array (VLA) studies of massive star formation regions in the early stages of ionization, as well as an analysis of numerical simulations of the evolution of these young HII regions. The results favor a picture in which very massive stars form in accretion flows that are partially ionized and that keep accreting material from their environment.

131p tachieuhoa 28-01-2024 9 2   Download

The paper "Origin and evolution of structure for galaxies in the local group" summarizes a review of recent attempts to reconstruct this complex evolution. We compare simulated properties with various observed properties of the Local Group. Among the generic features of simulated systems is the tendency for galactic halos to form within the dark matter filaments that define a supergalactic plane. Gravitational interaction along this structure leads to a streaming flow toward the two dominant galaxies in the cluster.

3p runordie3 27-06-2022 20 3   Download

Ebook Planets, stars and stellar systems – Volume 6: Extragalactic astronomy and cosmology present content star formation in galaxies, the cool ism in galaxies, the influence of environment on galaxy evolution, the large-scale structure of the universe, the distance scale of the universe...

707p thanghuynh1504 10-05-2020 27 2   Download

I present a study of spin vector orientations of 229,675zmagnitude SDSS (Sloan Digital Sky Survey) galaxies having red shift of 0.05 to 0.10. The z-magnitudes are observed through 913.3 nm CCD (charge coupled device) filter attached to SDSS telescope located at New Mexico, USA. We have converted two dimensional data to three dimensional by Godlowskian Transformation. Our aim is to find out non-random effects in the spatial orientation of galaxies. The expected isotropy distribution curves are obtained by removing the selection effects and performing a random simulation method.

16p nguathienthan1 27-11-2019 34 0   Download

The document Astronomy with Fundamental present the content: introduction, spherical astronomy, observations and instruments, photometric concepts and magnitudes, radiation mechanisms, celestial mechanics, the solar system, stellar spectra, binary stars and stellar masses, stellar structure, stellar evolution, the sun, variable stars, compact stars, the interstellar medium, star clusters and association, the milky way, galaxies, cosmology, astrobiology,

507p cao_duy_son 06-08-2019 40 1   Download

How galaxies � and yet larger structures � are formed remains one of the most interesting, topical and important questions facing astrophysicists and cosmologists today. This fully updated and revised edition of The Road to Galaxy Formation draws on the most recent observation of galaxies in the early universe obtained by the very latest ground- and space-based telescopes.

277p tom_123 14-11-2012 49 6   Download

The study of the formation and early evolution of stars has been an ever growing part of astrophysical research. Traditionally, often in the shadow of its big brothers (i.e., the study of stellar structure, stellar atmospheres and the structure of galaxies), it has become evident that early stellar evolution research contributes essentially to these classical fields. There are a few new items on the list of traditional astrophysical studies, some of which are more related to features known from the extreme late stages of stellar evolution.

409p tom_123 14-11-2012 55 10   Download

Water is one of the basic elements for life. It is even assumed that the evolution of life is only possible if there is liquid water present. A water molecule has some remarkable properties that make it quite unique in the universe. In the first chapter of this book we will review these basic properties of water and the role of water on Earth. All ancient civilizations realized the importance of water and their cities were constructed near great reservoirs of water.

249p tom_123 14-11-2012 69 8   Download