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Астронет: Астрономическая картинка дня Новые ударные волны СН 1987A http://variable-stars.ru/db/msg/1162717/eng |
Credit & Copyright: P. Challis and R. Kirshner
(CfA),
P. Garnavich
(Univ. Notre Dame),
SINS
Collaboration,
NASA
Explanation:
In February of 1987, astronomers witnessed the brightest
supernova
of modern times -
supernova 1987A in the
Large Magellanic Cloud.
Mysterious rings of material
surrounding the
expanding stellar debris
were soon emitting a visible glow excited by intense
light from the explosion.
After fading over the intervening years, the interior ring
has just been seen to
sprout four new hotspots, as illustrated in
these two versions of a
Hubble Space Telescope image recorded
on February 2nd.
The abrupt appearance of the new features suggests that
matter from the stellar blast wave itself has begun to
slam into the ring in earnest, shock-heating the gas and producing
the bright hotspots.
The left-hand picture shows the glowing ring, initially excited
by light from the explosion, along with the
shocked hotspots.
The right-hand picture has been further computer enhanced
to emphasize the hotspots.
The brightest spot at the right
was first observed in 1997, while the
four spots on the left half of the ring are new.
Astronomers now eagerly anticipate a dramatic
rejuvenation
of the glowing ring as the bulk of the blast wave material,
traveling at about 60 million kilometers per hour,
continues to plow into it.
Authors & editors:
Robert Nemiroff
(MTU) &
Jerry Bonnell
(USRA)
NASA Web Site Statements, Warnings,
and Disclaimers
NASA Official: Jay Norris.
Specific
rights apply.
A service of:
LHEA at
NASA /
GSFC
& Michigan Tech. U.