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Mysterious infrared light from space detected
In a first, researchers using the Atacama Large Millimeter/submillimeter Array (ALMA) telescope have detected the faintest and mysterious infrared light ever from space. By accumulating millimetre-waves from faint objects like this throughout the universe, the team determined that such objects were 100 per cent responsible for the enigmatic infrared background light filling the universe.
Tokyo: In a first, researchers using the Atacama Large Millimeter/submillimeter Array (ALMA) telescope have detected the faintest and mysterious infrared light ever from space. By accumulating millimetre-waves from faint objects like this throughout the universe, the team determined that such objects were 100 per cent responsible for the enigmatic infrared background light filling the universe.
By comparing these to optical and infrared images, the team found that 60 per cent of them were faint galaxies whereas the rest had no corresponding objects in optical/infrared wavelengths and their nature was unknown. Astronomers have found that there was faint but uniform light, called the "cosmic background emission", coming from all directions.
This background emission consists of three main components: Cosmic Optical Background (COB), Cosmic Microwave Background (CMB) and Cosmic Infrared Background (CIB). The origins of the first two have been revealed. The COB comes from a huge number of stars and the CMB comes from hot gas just after the Big Bang. However, the origin of the CIB was still to be solved.
