Un’Antica Supernova

About 3,700 years ago, people on Earth would have seen a brand-new bright star in the sky. As it slowly dimmed out of sight, it was eventually forgotten, until modern astronomers found its remains -- called Puppis A . Seen as a red dusty cloud in this image from NASA’s Wide-field Infrared Survey Explorer, or WISE, Puppis A is the remnant of a supernova explosion. Puppis A (pronounced PUP-pis) was formed when a massive star ended its life in an extremely bright and powerful explosion. The expanding shock waves from that explosion are heating up the dust and gas clouds surrounding the supernova, causing them to glow and creating the beautiful red cloud we see here. Much of the material from that original star was violently thrown out into space. However, some of the material remained in an incredibly dense object called a neutron star. This particular neutron star (too faint to be seen in this image) is moving inexplicably fast: over 3 million miles per hour! Astronomers are perplexed over its absurd speed, and have nicknamed the object, the “Cosmic Cannonball." Some of the green-colored gas and dust in the image is from yet another ancient supernova -- the Vela supernova remnant. That explosion happened around 12,000 years ago and was four times closer to us than Puppis A. If you had X-ray vision like the comic book hero Superman, both of these remnants would be among the largest and brightest objects you would see in the sky. This image was made from observations by all four infrared detectors aboard WISE. Blue and cyan (blue-green) represent infrared light at wavelengths of 3.4 and 4.6 microns, which is primarily from stars, the hottest objects pictured. Green and red represent light at 12 and 22 microns, which is primarily from warm dust.

Circa 3700 anni fa gli abitanti della Terra potrebbero avere visto una nuova stella brillare in cielo. Quando si è affievolita ed è scomparsa dalla vista, probabilmente è stata dimenticata, finché i moderni astronomi non hanno trovato i suoi resti, chiamati Puppis A.

Visibile in questa splendida immagine del telescopio WISE come una nube polverosa rossa, Puppis A è il residuo di un’esplosione di supernova.

Si è formata quando una stella massiccia ha terminato la sua vita con una detonazione estremamente brillante e potente. Le onde d’urto in espansione derivanti da quell’esplosione riscaldano le nubi di gas e polvere che circondano la supernova, facendole brillare.

Parte del gas e della polvere colorati in verde in questa immagine deriva da un’altra antica supernova, il resto di supernova delle Vele. Questa esplosione è avvenuta circa 12.000 anni fa ed è stata quattro volte più vicina a noi di Puppis A.

Blu e ciano rappresentano la luce a infrarossi a lunghezza d’onda di 3,4 e 4,6 micron, principalmente proveniente dalle stelle. Verde e rosso rappresentano la luce a 12 e 22 micron, emessa soprattutto dalla calda polvere.
[ Barbara Bubbi ]

http://wise.ssl.berkeley.edu/gallery_Puppis_A.html

Credit NASA/JPL-Caltech/WISE Team

Lascia un commento

Il tuo indirizzo email non sarà pubblicato. I campi obbligatori sono contrassegnati *