W49B
Encyclopedia
W49B or SNR G043.3-00.2 or 3C 398 is a nebula
and is thought to be a remnant of a gamma-ray burster. If so, it is the first one found.
W49B is barrel-shaped and located roughly 35,000 light-years from Earth. Recent findings indicate infrared
"rings" (about 25 light-years in diameter) around the "barrel", and also indicate intense X-ray
radiation coming from nickel
and iron
along its axis. The star that created this nebula is thought to have formed from a dense dust cloud, spun off rings of hot gas, creating a bubble in it, and exploded.
Nebula
A nebula is an interstellar cloud of dust, hydrogen gas, helium gas and other ionized gases...
and is thought to be a remnant of a gamma-ray burster. If so, it is the first one found.
W49B is barrel-shaped and located roughly 35,000 light-years from Earth. Recent findings indicate infrared
Infrared
Infrared light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light at 0.74 micrometres , and extending conventionally to 300 µm...
"rings" (about 25 light-years in diameter) around the "barrel", and also indicate intense X-ray
X-ray
X-radiation is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz and energies in the range 120 eV to 120 keV. They are shorter in wavelength than UV rays and longer than gamma...
radiation coming from nickel
Nickel
Nickel is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile...
and iron
Iron
Iron is a chemical element with the symbol Fe and atomic number 26. It is a metal in the first transition series. It is the most common element forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust...
along its axis. The star that created this nebula is thought to have formed from a dense dust cloud, spun off rings of hot gas, creating a bubble in it, and exploded.