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Astronomers Precisely Measured Velocity Of Supernova Shockwave

14 August, 2013


MessageToEagle.com - A research team led by Tomoro Sashida and Tomoharu Oka (Keio University) has succeeded in precisely measuring the expansion velocity of a shockwave of the supernova remnant W44.

The remnant is located in the constellation of Aquila, approximately 10,000 light-years away from our solar system.

The team observed the high-temperature and high-density molecular gas in the millimeter/submillimeter wave ranges.

The analysis shows that the expansion velocity of the W44 shockwave is 12.90.2 km/sec.


Image illustration of propagation W44 shockwaves in the molecular cloud.


It also became clear that the supernova explosion released kinetic energy of (1-3)1050 erg into the interstellar medium. The energy emitted from the Sun is approximately 3.6 1033 ergs/sec.

Can you image how enormous amount of energy is released from the supernova explosion? Furthermore, other molecular gas with an extremely high velocity of higher than 100 km/sec was also detected.

The origin of this super-high-velocity molecular gas remains unclear at the present time.

A star with a mass of more than eight times of the Sun releases tremendous energy when it is dying and undergoes a supernova explosion.

The shockwave caused by the supernova explosion expands, having a strong impact on the composition and physical state of surrounding interstellar materials. It also emits kinetic energy into interstellar space.

"Galactic winds" blasting out a large amount of gas are often observed in galaxies where explosively active star formations take place. The energy source of such galactic wind is also thought to be many supernova explosions.

In addition, the observations detected a molecular gas component with an extremely high velocity (>100 km/sec). These positions of super-high-velocity molecular gas are the exact locations where the sources of continuum radiation and a molecular hydrogen oscillation emission line are also detected.

This indicates that very strong shockwaves existed locally. The origin of the super-high-velocity component remains a mystery at the present time.

The research team plans to plow ahead this research to uncover the nature of the mysterious component. Furthermore, the team will observe a larger number of shocked gases surrounding the supernovae to confront these observational results with theoretical models of a supernova shockwave.

The scientific paper on which this article in based will appear in the Astrophysical Journal that will be issued on August 20, 2013.

Paper.

MessageToEagle.com

See also:
Extraordinary Phoenix Galaxy Cluster - One Of The Largest Objects In The Universe With Record-Breaking Star Formation

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