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Glossary term: Desvio para o vermelho

Description: Este termo pode se referir a três efeitos diferentes: desvio para o vermelho Doppler, cosmológico ou gravitacional. O desvio para o vermelho Doppler é o oposto do desvio para o azul; no caso do desvio para o vermelho, a fonte que emite a radiação eletromagnética está se afastando do observador, e assim o comprimento de onda da radiação eletromagnética é esticado para comprimentos de onda mais longos (mais avermelhados). Isso é semelhante ao efeito Doppler no contexto das ondas sonoras. O redshift ou desvio para o vermelho cosmológico é o resultado do alongamento para comprimentos de onda mais longos da radiação eletromagnética emitida por uma fonte devido à expansão física do espaço, ao contrário do redshift Doppler, que se deve ao movimento relativo. O redshift ou desvio para o vermelho gravitacional refere-se ao efeito em que o comprimento de onda da radiação eletromagnética emitida por uma fonte é alongado para comprimentos de onda maiores, ou seja, os fótons associados perdem energia ao tentarem sair de uma região (poço gravitacional) onde a gravidade é mais intensa.

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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of this term and its definition is still awaiting approval

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Galaxies map, each dot is a galaxy, forming a web-like structure, the outer circle marks a distance of 2 billion light years

SDSS Redshift Map

Caption: This image shows a map of the distribution of galaxies and is based on redshift data from the Sloan Digital Sky Survey (SDSS). Redshift measurements provides information on the distances, positions and motions of the galaxies. The Earth is located at the center of the image, and each dot represents a galaxy. The outer circle represents a ""distance"" of about 2 billion light years. The idea of distance in cosmology is complex because the usual measurement of distance is the separation between two points in space at the same time. However, because of the speed of light, the further a distance, the farther back in time we are observing. The numbers on the outer circle are Right Ascension coordinates mapped onto a flat circle, and provides information on the position of the galaxies on the sky. The colours used represent the ages of the stars in the galaxies, the redder, more strongly clustered points represent galaxies comprising of older stars. The dark wedges that do not contain any dots are regions that were not mapped by the SDSS due to dust from the Milky Way galaxy obscuring the view.
Credit: M. Blanton and Sloan Digital Sky Survey credit link

License: CC-BY-4.0 Creative Commons Attribution 4.0 International (CC BY 4.0) icons

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