Even after the two gamma-ray flashes observed, the scientists therefore searched for evidence of a supernova. But as carefully as they searched the sky region with the Keck Telescope in Hawaii and the Very Large Telescope of the European Southern Observatory (ESO), there were no traces of such a spectacular explosion.
After the gamma-ray flashes came from a dwarf galaxy teeming with heavy stars, the researchers believe in lightning the consequences of a relatively silent death of such a star. The black hole created by the collapse of the star produced the high-energy radiation as it absorbed the remaining matter of the star, the scientists said. However, how this quiet collapse happens exactly is still unclear. "Any previously unknown process is at work, " explains Italian astrophysicist Massimo Della Valle, one of the scientists involved. Now the researchers want to search for more gamma-ray flashes to find out the background of the unspectacular death of heavy stars.Neil Gehrels (NASA Goddard Spaceflight Center, Greenbelt) et al: Nature, Vol. 444, p. 1044 Massimo Della Valle (Astrophysical Observatory, Firenze) et al .: Nature, Vol. 444, p.1050 Johan Fynbo (University of Copenhagen, Dark Cosmology Center, ) et al .: Nature, Vol. 444, p. 1047 Avishay Gal-Yam (California Institute of Technology, Pasadena) et a .: Nature, Vol. 444, p. 1053 ddp / science.de? Ulrich Dewald ad