Mysterious supernova remnant puzzles astronomers

June 10th, 2009 - 12:13 pm ICT by ANI  

Washington, June 10 (ANI): Astronomers have been puzzled about the origin of a supernova remnant in space, which has a very different look.

This object, known as SNR 0104-72.3 (SNR 0104 for short), is in the Small Magellanic Cloud, a small neighboring galaxy to the Milky Way, and was found by NASA’s Chandra X-ray Observatory.

Astronomers think that SNR 0104 is the remains of a so-called Type Ia supernova caused by the thermonuclear explosion of a white dwarf.

While objects such as the Kepler and Tycho supernova remnants appear circular, the shape of SNR 0104 in X-rays is not.

Instead, the image is dominated by two bright lobes of emission. The large amount of iron in these lobes indicates that SNR 0104 was likely formed by a Type Ia supernova.

One possible explanation for this structure is that the explosion of the white dwarf itself was strongly asymmetrical and produced two jets of iron.

Another possibility is that the complicated environment seen in the image is responsible.

The green shells on the left and right side of SNR 0104 correspond to surrounding material that has been swept up by the explosion.

So, the unusual shape of the remnant might be caused by a lack of material to the north and south of the star to interrupt the outward path of the stellar debris.

This explanation, however, is still in question and scientists hope more data from Chandra and other telescopes will help settle the debate.

The presence of a nearby massive star and the shells of gas and dust seen in the wide-field view from Spitzer shows that SNR 0104 might be located within a star-forming region.

This suggests that SNR 0104 may belong to a little-studied class of so-called “prompt” Type Ia supernovas caused by the demise of younger, more massive stars than average.

Again, more data will be needed to test this theory. (ANI)

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