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A major milestone in stellar X-ray astronomy happened on April 5, 1974, with the detection of the strongest emission of X-rays up to that time [54] from Capella, measured at more than 10,000 times the x-ray luminosity of the Sun. [55] A rocket flight on that date briefly calibrated its attitude control system when a star sensor pointed the ...
The area of brightest X-ray emission is red. Such X-rays are not dangerous because they are absorbed by lower parts of the Earth's atmosphere. In this sample of images from 2004, bright X-ray arcs of low energy (0.1 – 10 keV) are generated during auroral activity. The images are superimposed on a simulated image of Earth.
GRB 221009A was an extraordinarily bright and very energetic gamma-ray burst (GRB) jointly discovered by the Neil Gehrels Swift Observatory and the Fermi Gamma-ray Space Telescope on October 9, 2022.
X-ray emission can easily penetrate moderate absorption from molecular clouds, and can be used to identify candidate cluster members. ... Pollux is the brightest star ...
Bright halos around 18 distant quasars [49] The Chandra X-ray image is of the quasar PKS 1127-145, a highly luminous source of X-rays and visible light about 10 billion light-years from Earth. An enormous X-ray jet extends at least a million light-years from the quasar. Image is 60 arcseconds on a side. RA 11h 30m 7.10s Dec −14° 49' 27" in ...
The galaxy NGC 1275 is located at the centre of the cluster, where the X-ray emission is brightest. The first detection of X-ray emission from the Perseus cluster (astronomical designation Per XR-1) occurred during an Aerobee rocket flight on March 1, 1970. The X-ray source may be associated with NGC 1275 (Per A, 3C 84), and was reported in ...
There is a small X-ray source 16″ from Cygnus X-3 that varies with the same period by a phase lag of about 2.7 h. This is thought to be a Bok globule at approximately the same distance as Cygnus X-3. Using molecular line emission from this object, two possible distances are found to be 6.1 ± 0.6 kpc and 7.8 ± 0.6 kpc.
Canopus is a source of X-rays, which are likely being emitted from its corona. The prominent appearance of Canopus means it has been the subject of mythological lore among many ancient peoples. Its proper name is generally considered to originate from the mythological Canopus , who was a navigator for Menelaus , king of Sparta .