| Nebula | |
|---|---|
 Image of the Slug nebula. The bright circular blue-white for is the quasar UM 287 while the blue haze is the nebula itself. | |
| Observation data | |
| Distance | z=2.283 |
| Physical characteristics | |
| Radius | 450 kpc pc |
| Notable features | One of the largest and luminous Lyman-alpha nebula |
The Slug nebula is one of the largest and most luminous Lyman-alpha nebula discovered so far extending over 450 kpc. The nebula sits at a distance of z=2.283 surrounds a bright quasar named UM287. [1]
It has a high surface brightness and is filimentary. This high surface brightness implies two things: (1) very large densities of cold and ionized gas, (2) very large colum densities of neutral hydrogen. [2]
