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Астронет: Астрономическая картинка дня Рукава NGC 4258 http://variable-stars.ru/db/msg/1221503/eng |
Credit & Copyright: X-ray:
Andrew Wilson (UMCP)
et al.,
NASA,
CXC
Optical: DSS / IR: NASA, JPL-Caltech / Radio: NRAO, AUI, NSF
Explanation:
Better known as M106, bright
spiral galaxy
NGC 4258 is about 30 thousand light years across and
21 million light years away
toward the northern constellation
Canes Venatici.
The yellow and red hues in
this composite
image show the
galaxy's sweeping
spiral arms
as seen in visible and
infrared light.
But x-ray
and
radio data
(blue and purple) reveal two extra
spiral arms -- arms that don't align with the more familiar tracers
of stars, gas, and dust.
In fact,
an analysis
of the x-ray and radio data suggests
that the anamolous arms are composed of material heated
by shock waves.
Detected at radio wavelengths,
powerful jets originating in the
galaxy's core likely drive the shocks into the disk
of NGC 4258.
Optical: DSS / IR: NASA, JPL-Caltech / Radio: NRAO, AUI, NSF
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.