Tycho-supernova-xray
Autor:
NASA/CXC/Rutgers/J.Warren & J.Hughes et al.
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2400 x 2400 Pixel (623759 Bytes)
Popis:
Tycho's Supernova Remnant. In 1572, the Danish astronomer Tycho Brahe observed and studied the explosion of a star that became known as Tycho's supernova. More than four centuries later, Chandra's image of the supernova remnant shows an expanding bubble of multimillion degree debris (green and red) inside a more rapidly moving shell of extremely high energy electrons (filamentary blue). As a huge ball of exploding plasma, it was Irving Langmuir who coined the name plasma because of its similarity to blood plasma, and Hannes Alfvén who noted its cellular nature. The filamentary blue outer shell of X-ray emitting high-speed electrons is also a characteristic of plasmas. This is a false-colour x-ray image in which the energy levels (in keV) of the x-rays have been assigned colours as follows: Red 0.95-1.26 keV, Green 1.63-2.26 keV, Blue 4.1-6.1 keV. All x-rays images must use processed colours since x-rays (as are radio waves, infra-red) are invisible to the human eye. But they are not invisible to suitable equipment, such as x-ray telescopes. The red and green bands highlight the expanding cloud of plasma with temperatures in the millions of degrees.
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Public domain
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Relevantní články
SN 1572SN 1572 nebo Supernova 1572 nebo Tychonova nova byla supernova v souhvězdí Kasiopea, jedna z mála supernov viditelných pouhým okem. Obecně se říká, že ji jako první objevil Tycho Brahe 11. listopadu 1572. V době objevu byla jasnější než Venuše. Na vrcholu své jasnosti dosáhla −4,1 mag. V březnu 1574 se její jas snížil pod hranici viditelnosti pouhým okem. Byla známá pod názvem „podivná hvězda“ nebo „hvězda poutník“. Své současné jméno získala až o dvě století později. .. pokračovat ve čtení