- Active Galactic Nuclei
This site contains images, spectra, light curves, resources and references for active galactic nuclei.
http://heasarc.gsfc.nasa.gov/docs/objects/agn/agn.html
(Added: Tue Oct 29 2002)
- Active Galaxies
Some galaxies exhibit evidence of extremely violent processes taking place within them. The most common signatures are non-thermal emission from the rf to X-ray region of the spectrum, and/or jets and unusual structure associated with the visual appearance of the galaxy.
http://csep10.phys.utk.edu/astr162/lect/active/active.html
(Added: Sat Oct 26 2002)
- Active Galaxies and Quasars
For "normal" galaxies, we can think of the total energy they emit as the sum of the emission from each of the stars found in the galaxy. For the "active" galaxies, this is not true. There is a great deal more emitted energy than there should be.
http://imagine.gsfc.nasa.gov/docs/science/know_l1/active_galaxies.html
(Added: Tue Oct 29 2002)
- Blazars
Blazars are a special kind of active galaxy characterized by very rapid variability, high and variable polarization, superluminal motion, and very high luminosities - in short they are the most ``active'' kind of Active Galactic Nuclei.
http://nedwww.ipac.caltech.edu/level5/Urry/Urry1.html
(Added: Sat Oct 26 2002)
- Frequently Asked Questions About Quasars
Get answers to frequently asked questions about Quasars from Dr. John Simonetti of the Department of Physics at Virginia Tech.
http://www.phys.vt.edu/~jhs/faq/quasars.html#q1
(Added: Tue Oct 29 2002)
- Gravitational Lensing
One important consequence of the influence of Einstein's gravitation on light is that gravitational masses can alter the direction of light and cause lensing effects.
http://csep10.phys.utk.edu/astr162/lect/galaxies/lensing.html
(Added: Sat Oct 26 2002)
- Quasars
These objects were named Quasistellar Radio Sources (meaning "star-like radio sources") which was soon contracted to quasars.
http://csep10.phys.utk.edu/astr162/lect/active/quasars.html
(Added: Sat Oct 26 2002)
- Quasars - Hubble Space Telescope
This site contains images of Quasars from the Hubble Space Telescope.
http://oposite.stsci.edu/pubinfo/quasars.html
(Added: Tue Oct 29 2002)
- Quasars and Active Galactic Nuclei
This site covers quasars and active galactic nuclei and contains image galleries.
http://www.astr.ua.edu/keel/agn/
(Added: Sat Oct 26 2002)
- Radio Galaxies
Radio galaxies are usually elliptical. They often exhibit jet structure from a compact nucleus. They typically exhibit two lobes of radio frequency emission that are often approximately aligned with the jets observed in the visible spectrum and that may extend for millions of light years.
http://csep10.phys.utk.edu/astr162/lect/active/radio.html
(Added: Sat Oct 26 2002)
- Seyfert Galaxies
Seyfert galaxies are usually (but not always) spirals with very bright (almost starlike) nuclei. They exhibit a strong continuum from IR through X-ray regions of the spectrum, with emission lines that are sometimes variable.
http://csep10.phys.utk.edu/astr162/lect/active/seyfert.html
(Added: Sat Oct 26 2002)
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