Veil Nebula

The Veil Nebula (also known as the Cygnus Loop or Veil Nebula, Veil nebula English, referred to ) is a collection of emission and reflection nebulae, which are located at a distance of about 1,500 light-years in the constellation Cygnus. They are together the remnant of a supernova that occurred about 18,000 years ago. Various parts of the remnant have different NGC and IC numbers. So are the objects NGC 6960, NGC 6974, NGC 6979, NGC 6992, NGC 6995 and IC 1340 all the same structure.

The nebula was discovered on September 5, 1784 by William Herschel. He described him as " Extended; passes thro ' 52 Cygni ... near 2 degree in length "; the eastern part as " Branching nebulosity ... The Following part divides into several streams uniting again towards the south. "

Investigations

First photographs have already been prepared and published at the end of the 19th century by Isaac Roberts. The fog is but despite its overall brightness of approximately 7 may not be easily observed because of its large surface area of 230 ' x 160' for amateur astronomers; are helpful line filter for ionized gases to separate him from the light of background stars. In scientific studies, especially in the short wavelength spectral range, the fog comes out clearly.

Ultraviolet absorption with GALEX

For scientists, it is an ideal target, since it is not obscured by foreground objects. There have been and are on him numerous studies on the gas structure and gas dynamics of supernova remnants carried out, for example, detailed studies with the Hubble Space Telescope. Investigations by the ROSAT satellite show that the entire nebula in X-rays similar to a light bulb lit. However, the compact remnant ( neutron star, pulsar or black hole ) of the supernova is not known.

Filament, were studied on the speed and ionized gases ( OV, NV, CIV, HeII ).