population III

population III

A hypothetical population of supermassive stars that could have existed before the galaxies formed. They could have produced the large helium content of the Universe and the microwave background radiation, both usually attributed to the early stages of the Big Bang. If population III stars did exist, cosmologists would need to severely modify current forms of the Big Bang theory.

population III

[‚päp·yə′lā·shən ′thrē]
(astronomy)
A class of stars that condensed from the gas formed in the nucleosynthesis of the big bang, and consist entirely of hydrogen and helium.
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Much of our 900 hours of guaranteed time will be spectroscopy of high redshift galaxies, and i am leading the deep tier of our survey to get accurate redshifts (vital for luminosity functions), measure the stellar populations (ages and star formation rates), assess the escape fractions of ionizing photons and determine the metal enrichment (potentially finding the long-sought ""population iii"", the first stars to form).
It would have taken several cycles of star-birth and supernova explosions for there to be enough oxygen to be detected by our instruments today, considering the fact that the oldest stars - called Population III stars - had extremely short lifespans of about 2 million years only.
These first-generation stars, called Population III, would have been responsible for churning out the heavier elements that shaped the evolution of second-generation stars and the galaxies they lived in.
Stars typical of the first stellar generation, known as Population III stars, are prime candidates as the source of all that energy.
Scientist Luigi Piro, the director of research at the Institute for Space Astrophysics said that one of the great challenges of modern astrophysics has been the quest to identify the first generation of stars to form in the universe, which they refer to as Population III stars.
Papers address high-mass star formation by gravitational collapse of massive cores, the binarity of Eta Carinae, metallicity-dependent Wolf-Rayet winds, and an overview of cosmic infrared background and Population III, among other topics.
The book concludes with the wider cosmological implications, including Population III stars, Lyman break galaxies, and gamma-ray bursts, for each of which massive stars are believed to play a crucial role.
360 Heads of the secondary schools were taken as population III of the study.
The three populations in this study were designated Population II, Population III, and Population VII.
Problem behavior and psychiatric impairment in a developmentally disabled population III: Psychotropic medication.
Over the past decade, a new type of star has emerged at the forefront of stellar astrophysics: Population III. These were the first stars born in the universe, when the cosmos was only a few hundred million years old (S&T: May 2006, page 30).

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