Cosmic gamma-ray telescope Swift extremely lucky — the second time in a week his work rewarded by publications in a serious magazine. And the second time thanks to this tool astronomers have found something they've never seen before. It is a powerful flash of gamma-ray, which Swift observed on March 28.
Funeral gamma ringing
After initial outbreaks in the constellation Draco, scientists thought they saw a typical supernova explosion, and gave the gamma ray burst called GRB 110328A. However, on March 31 astrophysicist Joshua Bloom (Joshua Bloom) from the University of California at Berkeley (UC Berkeley) reported that the duration and nature of the flash does not give to take it to a typical gamma-ray burst. Astronomers intrigued that she had four flare maximum in the first four hours, and the source has not disappeared to this day. "It's really different from all the flashes that we saw earlier," — said Bloom. Source of the burst was identified with the center of the galaxy, located 4 billion light-years away. Based on the fact that at the center of this galaxy to be a massive black hole, astronomers have shown that long gamma-ray bursts could produce a long tear a hole close podletevshey star.
"This flare unleashed a wild amount of energy that continues to be released, even today, two and a half months later. Hole, tearing a star apart, its remains spins into a spiral, as the water in the cup, and this process is accompanied by a large energy ", — said Bloom.
Death in the cup
In a paper published in the journal Science, researchers assessed the scale disaster. According to their calculations, the time of the death star about 10% of its mass has become X-ray and gamma-radiation, carried away by the two rays emanating from the center hole. The path of one of these beams and happened to be the Earth and the satellite Swift.
Digging into the past observations of this part of the sky, the researchers did not find any evidence of the activity of the gamma-ray and concluded that witnessed a single phenomenon. "We see sitting quietly black hole, which does not absorb the gas, but suddenly explode! The same thing can happen in our galaxy. From a distance it seems that the hole is dormant until the star is not random flies close and will not be torn to pieces, "- said Bloom. Watch these "swan song" of stars scientists had before — though the X-ray, visible, and ultraviolet regions, but not in gamma rays. "Any one can observe this galaxy with a probability of once in a hundred million years", — said Bloom.