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
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.)
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).
Fast Facts for G352.7-0.1:
Category: Supernovas & Supernova Remnants
Coordinates (J2000): RA 17h 27m 41.00s | Dec -35° 06' 45.00"
Constellation: Scorpius
Observation Date: 06 Oct 2004
Observation Time: 12 hours 23 min
Obs. ID: 4652
Instrument: ACIS
References: Pannuti, T. et al. 2014, ApJ 782, 102; arXiv:1401.6603
Color Code: X-ray (Blue); Optical (Grayscale); Infrared (Orange); Radio (Pink)
Distance Estimate: 24,000 light years
Source: NASA’s Chandra X-ray Observatory