Credit: Courtesy
BeppoSAX Team
Explanation:
This sequence of three false color X-ray pictures
from the
Italian/Dutch BeppoSAX satellite
follows the fading glow from
a gamma-ray burster.
This burster triggered orbiting gamma-ray observatories
on December 14, 1997
and within 6.5 hours the sensitive
X-ray cameras onboard BeppoSAX had been turned to
record the first image (left) of the afterglow.
Each image covers a field about the size of the full moon with the
position of the afterglow indicated by the white circle.
The first two pictures were taken 6 hours apart, while the final
picture was made 2 days after the gamma-ray burst.
Initiated by an unknown but immensely powerful explosive event,
gamma-ray bursts
are thought to be caused by blast waves
of particles moving at nearly the speed of light.
The expanding cosmic fireball produces seconds-long bursts of
gamma-rays and then as it slows and sweeps up surrounding material,
generates an afterglow visible for many days at X-ray, optical,
and radio energies.
Evidence indicates that this burst
originated at a distance
of 12 billion light-years requiring a fantastic and extreme energy source.
What could power a gamma-ray burst?
1999 2000 2001 2002 2003 2004 2005 2006 2007 |
Январь Февраль Март Апрель Май Июнь Июль Август Сентябрь Октябрь Ноябрь Декабрь |
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
|
Публикации с ключевыми словами:
gamma-ray burst - afterglow - X-ray - гамма-всплески - послесвечение - рентгеновское излучение - оптическое послесвечение - Радиоизлучение
Публикации со словами: gamma-ray burst - afterglow - X-ray - гамма-всплески - послесвечение - рентгеновское излучение - оптическое послесвечение - Радиоизлучение | |
См. также:
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