Experimental basis of radio galaxies

In the 20th century, due to the application of the most advanced science and technology in astronomical observation, many new phenomena were discovered, which may be the evidence of "BIGBANG". Through spectral observation, it is found that distant galaxies are retreating from each other at high speed. This shows that the galaxy system is in an expanding state. Astronomers further calculated that the age of the universe is about 20 billion light years. On the cosmic time scale, the moon rocks and the oldest meteorites are 4.6 billion years old. The age of the oldest star in the galaxy deduced from the stellar evolution model is 65.438+0.5 billion years. So far, the time scales of different celestial bodies measured by various independent methods are all within 20 billion years determined by the speed-distance relationship of galaxies, which shows that the age of the universe is limited. Helium and Deuterium in the Universe Through the observation of relatively primitive interstellar gas, it is found that in the Milky Way and many extragalactic galaxies, the isotope deuterium of light elements helium and hydrogen is basically evenly distributed relative to the amount of hydrogen. This is in sharp contrast to the uneven distribution of many heavy elements, which is explained by the big bang theory: because the expected high temperature and high density in the first few minutes after the big bang easily lead to the synthesis of light elements; However, heavy elements are synthesized in the depths of many stars' cores, and they are not dispersed in large quantities until a supernova explosion occurs, and the amount relative to hydrogen will not be evenly distributed. A large number of observations of radio galaxies with synthetic aperture radio telescope in 1960s show that the number of dark and weak radio sources with galaxy-level energy is much more than expected under the assumption that radio galaxies are evenly distributed in space, that is, radio galaxies are not actually evenly distributed in space. It can be inferred that on the cosmic time scale, radio galaxies evolved from stronger sources to weaker sources.

Microwave background radiation 1965 It was first discovered that there is background radiation in the universe. It has a blackbody spectrum, which is blackbody radiation with a temperature equivalent to 274K, and is generally called 3K microwave background radiation. This radiation is only interpreted as the dim afterglow of the hot fireball in the early universe. According to the Big Bang theory, with the expansion of the universe, the hot blackbody radiation of the original fireball will inevitably lengthen the wavelength and lower the temperature, resulting in that no 3K background radiation can be observed in the microwave section today.

Tencent Technology News According to foreign media reports, recently, Australian astronomers released the image of the radio galaxy Centauri A, and they have successfully drawn the detailed image of the radio galaxy, which is conducive to our further understanding of the strange astronomical phenomena of the radio galaxy.

It is reported that the team led by Australian scientist Dr. Lena Finn publicly released their images at the Sagittarius Galaxy Diversity Conference held in Sydney last week. Scientists discovered through the National Astronomical Telescope of the Commonwealth Scientific and Industrial Research Organization of Australia: "Only a few galaxies are of this shape. They are like blue whales in the vast space.

In order to draw this detailed image, scientists used the Australian small array and Parker Radio Telescope to observe 1 0,200 hours, took 406 pictures, and spent 1 0,000 hours processing these pictures by computer.

Centauri A is a galaxy in the Centauri Cluster, which is 0/40,000 light-years away from Earth and surrounded by radio nebulae. The new image shows that the structure of the nebula is formed by the accumulation of ray particles from a supermassive black hole with a new center. When a particle stream releases energy in a galaxy, it forms two different halves. Professor Ken Freeman from Mount Matrix University in Canberra said: "This detailed picture gives us an overall impression and view of this nebula. Nebulae are like clouds in the sky, just as clouds have different shapes, so are radio galaxies. "

According to scientists, the study of radio galaxies must study a series of spectra, such as visual spectrum and X-ray spectrum, and understanding the differences between them is exactly what astronomy pays attention to.

According to foreign media reports, recently, Australian astronomers released an image of the radio galaxy Centauri A, and they have successfully drawn a detailed image of the radio galaxy, which is conducive to our further understanding of the strange astronomical phenomena of the radio galaxy.

It is reported that the team led by Australian scientist Dr. Lena Finn publicly released their images at the Sagittarius Galaxy Diversity Conference held in Sydney last week. Scientists discovered through the National Astronomical Telescope of the Commonwealth Scientific and Industrial Research Organization of Australia: "Only a few galaxies are of this shape. They are like blue whales in the vast space.

In order to draw this detailed image, scientists used the Australian small array and Parker Radio Telescope to observe 1 0,200 hours, took 406 pictures, and spent 1 0,000 hours processing these pictures by computer.

Centauri A is a galaxy in the Centauri Cluster, which is 0/40,000 light-years away from Earth and surrounded by radio nebulae. The new image shows that the structure of the nebula is formed by the accumulation of ray particles from a supermassive black hole with a new center. When a particle stream releases energy in a galaxy, it forms two different halves. Professor Ken Freeman from Mount Matrix University in Canberra said: "This detailed picture gives us an overall impression and view of this nebula. Nebulae are like clouds in the sky, just as clouds have different shapes, so are radio galaxies. "

According to scientists, the study of radio galaxies must study a series of spectra, such as visual spectrum and X-ray spectrum, and understanding the differences between them is exactly what astronomy pays attention to.