GALACTIC HALO

The term 'galactic halo' denotes a component of spiral galaxies, including our galaxy, the Milky Way, which extends farther out than the disk, which is the most visible part of a spiral galaxy.
'Galactic halo' may mean:

★ the galactic spheroid component - stars

★ the galactic corona - some hot gas (ie. a plasma)

★ the dark matter halo of a galaxy
The galactic spheroid and the dark matter halo are concentrated towards the centre of their galaxy, and are roughly spherically symmetric.
In an elliptical galaxy, there is no sharp transition between the body of the galaxy and the halo.

Contents

See also

References

External links

See also

★ Galaxy formation and evolution

★ Galactic coordinate system

★ Galactic bulge

★ Disc galaxy

★
★ Spiral arm

★ Galactic spheroid

★ Galactic corona

References

★ Diemand, J. & Moore, B. & Stadel, J. (2005, January 27). Earth-mass dark-matter haloes as the first structures in the early universe. In ''Nature, 433'', 389 – 391.

External links

★ http://chandra.harvard.edu/photo/2006/n5746/