Electro Magnetic Spectrum. Electromagnetic Spectrum - Introduction. The electromagnetic (EM) spectrum is the range of all types of EM radiation.
Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation. The other types of EM radiation that make up the electromagnetic spectrum are microwaves, infrared light, ultraviolet light, X-rays and gamma-rays. Gamma-ray telescope (astronomy.
The History of Gamma-ray Astronomy - Introduction. Long before experiments could detect gamma-rays emitted by cosmic sources, scientists had known that the Universe should be producing such high energy photons.
Hard work by several brilliant scientists had shown us that a number of different processes which were occurring in the Universe would result in gamma-ray emission. These processes included cosmic ray interactions with interstellar gas, supernova explosions, and interactions of energetic electrons with magnetic fields. In the 1960s, we finally developed the ability to actually detect these emissions and we have been looking at them ever since! Crab pulsar dazzling gamma-ray beams. A thousand years ago, a brilliant beacon of light blazed in the sky, shining brightly enough to be seen even in daytime for almost a month.
Native American and Chinese observers recorded the eye-catching event. We now know that they witnessed an exploding star, which left behind a gaseous remnant known as the Crab Nebula. The same object that dazzled skygazers in 1054 C.E. continues to dazzle astronomers today by pumping out radiation at higher energies than anyone expected. Tycho's star shines in gamma rays. PICTURE OF THE DAYsee all » The Witch Head Nebula (IC 2118) is a faint reflection nebula in the constellation Eridanus the River.
It lies about 900 light-years from Earth. The nearby bright star Rigel (Beta Orionis) illuminates the nebula. Tycho’s star lives on in gamma rays. Tycho’s star lives on in gamma rays DR EMILY BALDWINASTRONOMY NOWPosted: 14 December 2011 Using the Fermi Gamma-Ray Space Telescope, astronomers have found that the shattered remains of the 1572 supernova event known as ‘Tycho’s supernova’ live on in high-energy gamma rays, providing vital insight into the generation of cosmic rays.
Tycho’s supernova is named after the Danish astronomer Tycho Brahe, who studied the exploded stellar remains extensively when the bright ‘star’ appeared in the skies in 1572. Now, after several years of data collection using the space-based Fermi satellite’s Large Area Telescope (LAT), astronomers have detected high energy gamma rays emanating from the supernova, providing clues into the origin of cosmic rays – subatomic particles that move through space at nearly the speed of light. Where and how cosmic rays gain their high energies is much debated; their sources are not readily identifiable since their paths are easily deflected by stellar magnetic fields.
S Fermi Shows That Tycho's Star Shines in Gamma Rays. NASA's Fermi Shows That Tycho's Star Shines in Gamma Rays › Larger image Gamma-rays detected by Fermi's LAT show that the remnant of Tycho's supernova shines in the highest-energy form of light.
This portrait of the shattered star includes gamma rays (magenta), X-rays (yellow, green, and blue), infrared (red) and optical data. (Credit: Gamma ray, NASA/DOE/Fermi LAT Collaboration; X-ray, NASA/CXC/SAO; Infrared, NASA/JPL-Caltech; Optical, MPIA, Calar Alto, O.