| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 1,762,326,818 visitors served. |
|
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
Seyfert galaxy |
Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson | 0.03 sec. |
|
Seyfert galaxy [′zī·fərt ‚gal·ik·sē] (astronomy) A galaxy that has a small, bright nucleus from which violent explosions may occur. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
|
| ? Mentioned in | ? References in periodicals archive | |
|---|---|---|
Scientists have generally agreed that radiation pouring out of active galactic nuclei (AGNs) - quasars, Seyfert galaxies, and other compact sources - accounts for at least half the low-energy portion of the X-ray background. For years, astronomers have suspected that relatively small black holes fuel the energetic activity found at the core of M51 and several other galaxies, called LINERs (for low-ionization narrow emission-line region), just as larger black holes may power the more luminous cores of Seyfert galaxies. The parent galaxies would therefore appear to emit only the narrow bands of light characteristic of certain radio or Type II Seyfert galaxies. |
| Encyclopedia |
| Free Tools: |
For surfers:
Free toolbar & extensions |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|