Supernova Cleans Up Its Surroundings
Supernovas are the spectacular ends to the lives of many massive stars.
These explosions, which occur on average twice a century in the Milky Way, can
produce enormous amounts of energy and be as bright as an entire galaxy. These
events are also important because the remains of the shattered star are hurled
into space. As this debris field – called a supernova remnant – expands, it
carries the material it encounters along with it.
Astronomers have identified a supernova remnant that has several unusual
properties. First, they found that this supernova remnant – known as G352.7-0.1
(or, G352 for short) – has swept up a remarkable amount of material, equivalent
to about 45 times the mass of the Sun.
Another atypical trait of G352 is that it has a very different shape in radio
data compared to that in X-rays. Most of the radio emission is shaped like an
ellipse, contrasting with the X-ray emission that fills in the center of the
radio ellipse. This is seen in a new composite image of G352 that contains
X-rays from NASA’s Chandra X-ray Observatory in blue and radio data from the
National Science Foundation's Karl G. Jansky Very Large Array in pink. These
data have also been combined with infrared data from the Spitzer Space Telescope
in orange, and optical data from the Digitized Sky Survey in white. (The
infrared emission to the upper left and lower right are not directly related to
the supernova remnant.)
A recent study suggests that, surprisingly, the X-ray emission in G352 is
dominated by the hotter (about 30 million degrees Celsius) debris from the
explosion, rather than cooler (about 2 million degrees) emission from
surrounding material that has been swept up by the expanding shock wave. This is
curious because astronomers estimate that G352 exploded about 2,200 years ago,
and supernova remnants of this age usually produce X-rays that are dominated by
swept-up material. Scientists are still trying to come up with an explanation
for this behavior.
Although it does not produce a lot of X-ray emission, the amount of material
– the aforementioned 45 times the Sun’s mass – swept up by G352 is remarkably
high for a supernova remnant located in our Galaxy. This may indicate that a
special type of evolution has occurred, in which the massive star that exploded
to create G352 interacted with an extraordinary amount of dense surrounding
material.
Astronomers also conducted a search for a neutron star that may have been
produced by the supernova explosion. They did not find any hints of a neutron
star in G352, another astronomical puzzle involved with this system. One
possibility is simply that the neutron star is too faint to be detected or that
the supernova created a black hole instead.
G352 is found about 24,000 light years from Earth in the Milky Way galaxy. A
paper describing these enigmatic results was published in the February 20th,
2014 issue of The Astrophysical Journal, and is available online. The first
author of this paper is Thomas Pannuti from Morehead State University in
Morehead, Kentucky, with co-authors Oleg Kargaltsev (George Washington
University), Jared Napier (Morehead State), and Derek Brehm (George
Washington).
Image credit: X-ray: NASA/CXC/Morehead State Univ/T.Pannuti et al.; Optical:
DSS; Infrared: NASA/JPL-Caltech; Radio: NRAO/VLA/Argentinian Institute of
Radioastronomy/G.Dubner
NASA
Guillermo Gonzalo Sánchez Achutegui
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