Cassiopeia A (Cas A) (listen) is a supernova remnant (SNR) in the constellation Cassiopeia and the brightest extrasolar radio source in the sky at frequencies above 1 GHz. The supernova occurred approximately 11,000 light-years (3.4 kpc) away within the Milky Way; given the width of the Orion Arm, it lies in the next-nearest arm outwards, the Perseus Arm, about 30 degrees from the Galactic a… WebThe spectral indices of 68 radio shell supernova remnants show no correlation with supernova radius, supernova age or galactic height. This is interpreted as an indication of a repowering process active throughout most of the life of a supernova remnant. Bell's (1978) repowering mechanism is highly appropriate in this respect, since for each …
Radius of the Vela pulsar. - NASA/ADS
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On the spectral index distribution of supernova remnants
The most luminous supernova ever recorded is ASASSN-15lh, at a distance of 3.82 gigalight-years. It was first detected in June 2015 and peaked at 570 billion L☉, which is twice the bolometric luminosity of any other known supernova. [34] Visualizza altro A supernova (PL: supernovae or supernovas) is a powerful and luminous explosion of a star. A supernova occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into … Visualizza altro Compared to a star's entire history, the visual appearance of a supernova is very brief, sometimes spanning several months, so that the chances of observing one with the … Visualizza altro Astronomers classify supernovae according to their light curves and the absorption lines of different chemical elements that appear in their spectra. If a supernova's spectrum contains lines of hydrogen (known as the Balmer series in the visual … Visualizza altro Supernovae events generate heavier elements that are scattered throughout the surrounding interstellar medium. The expanding shock wave from a supernovae can trigger star formation. Galactic cosmic rays are generated by supernova explosions. Visualizza altro The word supernova has the plural form supernovae /-viː/ or supernovas and is often abbreviated as SN or SNe. It is derived from the Latin word nova, meaning "new", which … Visualizza altro Supernova discoveries are reported to the International Astronomical Union's Central Bureau for Astronomical Telegrams, which sends out a circular with the name it assigns to … Visualizza altro Supernova type codes, as summarised in the table above, are taxonomic: the type number is based on the light observed from the supernova, not necessarily its cause. For … Visualizza altro WebDonald G. York, in Encyclopedia of Physical Science and Technology (Third Edition), 2003 VII.A Supernova Rates. Supernovae are difficult to find because the visible supernovae occur only once per 30–300 years. Regions with higher rates are often shrouded in dust clouds or extinguished by nearby dust clouds. Thus, little is known about supernova … WebMostly, a typical supernova is a few kpc (kilo parsec) radius, but if it is a hypernova, then it is a completley different story, and the beam can reach all the way across the universe! If you would like to know more, then just e-mail me, … hoststar thai