SPNEW · Ages of Galaxies and Constraints on Galaxy Formation
6РП — Действия „Мария Кюри“
- Период
- 2005-04-01 → 2007-03-31
- Финансиране от ЕС
- 161 428 €
- Участници
- 1
- Схема
- EIF
Линиите свързват координатора с партньорите. За проекти отпреди 2014 г. CORDIS не винаги дава точни координати. Тези точки са на ниво град или държава.
Накратко на български
Възрастта на далечните галактики се определя чрез сравняване на светлината от звездите им със специални физични модели. Това помага за по-точното разбиране на процесите по формиране на галактиките и еволюцията на Вселената.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - SPNWE (Ages of Galaxies and Constraints on Galaxy Formation)
The aim of the project was to develop a modelling of astronomical data that could ensure precision in the derivation of the ages of distant galaxies. The age of a galaxy is an extremely important property that can set constraints to galaxy formation models, that in turn are strictly connected to our modern view of evolution in the Universe in a cosmological context. The age of a distant galaxy is obtained by the age of its stars, which in turn is obtained by comparing the luminous emission by the stars themselves with so-called stellar population models. These models exploit robust knowledge of the physics of the stellar interiors to make predictions of the energy emitted by an ensemble of stars such as a galaxy. The fellow is a well-recognised expert of such models and together with her collaborators has contributed substantially to the improvement in the field. In particular, in 2005 while at Oxford she has published a paper describing innovative models that for the first time incorporate the energy contribution by red giant stars evolving through the last giant phase of stellar evolution. The inclusion of these stars has dramatically improved the interpretation of galaxy data, noticeably of the primeval galaxies populating the extreme Universe whose data can be acquired only with modern satellites. Previous models failed to describe the energetic emission of these galaxies and could not provide reliable estimates of the galaxy formation epochs and masses. The original modelling by the fellow in 2005 has definitively opened a new era in this type of study. In 2007, the major competitors of the fellow have publicly agreed that the new models are superior.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
We propose to put quantitative constraints on hierarchical galaxy formation models, by determining the ages and the detailed chemical compositions of the largest sample of galaxy data available nowadays, and to correlate those properties with galaxy enviro nment. The size of the sample ensures statistically significant results. The determination of the ages and chemical abundances will be performed with up-to-date stellar population models, that allow for the first time to quantify the two key properties of the galaxy stellar populations, that are: a) the fraction of truly young stars; b) the relative proportions of chemical elements like magnesium and iron, that are the key to understand the past history of star formation. With our approach we are in the pos ition at constraining the global star formation history of galaxies. This is a very important goal, since the understanding of the baryonic component of galaxies is the biggest challenge to modern models of galaxy formation. Therefore the results achieve d with the present project are expected to provide a strong push forward to these theories and to our understanding of the cosmological formation of structures in the Universe.
Оригинален текст от CORDIS (на английски).
Участници
- CHANCELLOR, MASTERS & SCHOLARS OF THE UNIVERSITY OF OXFORD · OXFORDКоординаторНиво градОбединеното кралство
Връзки
Данни: CORDIS, © Европейски съюз