Specialists from the Institute of Astronomy them. Max Planck (Germany), National Accelerator Laboratory. Fermi, Raytheon Company and the University of Michigan (all - USA) estimated the parameters 240 thousand stars and created a chart of volume distribution of stellar matter in our galaxy.
We used data collected as part of the project SEGUE - large-scale spectroscopic investigations of stars of the Milky Way, because other sources of primary information, the authors have not been on mapping shows only the northern celestial hemisphere.
Vertical lines mark the intervals of latitude for different values of longitude, which were investigated in the framework of the project SEGUE (an illustration of The Astrophysical Journal).
To determine the position of the star, it is necessary, as is known, to establish its absolute magnitude, knowing how much it differs from the apparent magnitude, we can calculate the distance that separates the observer from the object. Rate the absolute magnitude helps Hertzsprung - Russell, linking this option with the color of the star. Computer program used by the authors to submit data as Hess diagrams, which are easily obtained after determining the position of stars in the Hertzsprung - Russell.
When you create maps of astrophysics into account two characteristics of celestial bodies: the mass and Metallicity. In other words, the card allows you to estimate the change of density and metallicity of stellar material in the volume of the Milky Way.
Researchers have identified several previously unknown areas of increased density of matter in different parts of the galaxy, which require further study.
The distribution of stellar matter in the Milky Way. Corresponding to each image of galactic longitude listed below, black color indicates the highest density, with the transition to a lighter shade points lower density of 10 times.
Full report published edition of The Astrophysical Journal; preprint articles can be downloaded from arXiv.
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