According to a team of astronomers conducting the Sloan Digital Sky Survey (SDSS-II), the intergalactic space seems to be filled with fuzzy smoke of tiny dust particles that blur the light. light from distant objects simultaneously transforms their colors subtly.
"The galaxies contain a lot of dust, most of the dust is formed in the outer regions of dying stars," said lead researcher Brice Ménard of the Canadian Institute of Theoretical Physics . The amazing thing is that we are seeing dust lying hundreds of thousands of light years away from galaxies, in the intergalactic space '.
To investigate the characteristics of dust, the team analyzed the colors of distant quasars. Their light passes through the vicinity of the close-up galaxies en route to Earth.
Green light-blocking dust particles are more effective than red light, explains astronomer Ryan Scranton of the University of California, Davis - another member of the research team. 'We see this when the sun goes down: light rays pass through the thick atmosphere, absorb more than blue light, making the sun seem to become redder. We also found that there is currently a red standard of similarity due to cosmic dust, and this phenomenon is 10 times stronger than the outer edge of galaxies'.
Spiral galaxies often have dark lines that are dust in space that prevents light from emitting stars from galaxies.In the figure is NGC 4565 galaxy captured by Sloan Digital Sky Survey (SDSS-II).Dust formed in the outer region of the stars is gradually fading, it floats and mingles with the gas in the universe.The color analysis of the quasar shows that galaxies also simultaneously expel dust within a few hundred thousand light-years, far more than 10 times the observed edge of the galaxy in the image.The thin smoke containing dust particles obscures and reduces light from quasars on the background.(Photo: Sloan digital sky survey).
The team analyzed the colors of about 100,000 distant quasars located behind 20 million galaxies, using images of SDSS-II. Members of the research team, Gordon Richards of Drexel University, said: 'Gathering and analyzing all data requires a clear idea from statistics and computer science. Finding the average number of many objects allows us to determine how small the impact is if we observe any particular quasar '.
Ménard explains supernova explosions and winds from massive stars blowing air away from a few galaxies. This gas may be accompanied by dust. Next, dust can be pushed directly by the stars.
Dust between planets may also affect pre-planned cosmic experiments that use supernova to explore the nature of dark energy - a mysterious component in the universe responsible for promoting the expansion process of the universe.
Scranton said: 'Like domestic dust, cosmic dust is very difficult for you. Our results imply that most distant quasars are seen through a thin smoke, which may affect their distance estimates. '
Ménard explains that cosmic dust does not replace the need for dark energy to explain supernova data, but it can complicate future process measurements with high accuracy in the future. 'These experiments have a lot of ambition for goals and difficult to observe is a factor worth considering'.
Refer
Đang xác định các galaxy-mass và cơ sở dữ liệu-cơ bản có sự xác định qua Magnification và reddening.Monthly Notices of the Royal Astronomical Society, (in press)