Astronomy Magazine

Radio Galaxies

Posted on the 25 May 2011 by Gabe12logan
Radio galaxies are galaxies that are extremely bright in the radio part of the spectrum. In the majority of detected radio galaxies a strong emission of radio waves was found in the area near the center of  the galaxy, and often occurs the radio-bright halo. Discovered  radio waves are very often highly polarized, as astronomers have  interpreted as the radio show very high energy electrons, moving near the speed of light. It is believed that the cause was a very dramatic event, where the freed energy is equivalent to that which is released with annihilation of ten million stars.
Stronger sources are at greater distances from the weaker. Looking deeper into the universe at the same time we look further into the past, so the above findings suggest the evolution of radio galaxies from stronger to weaker sources. It is the big bang theory, unlike competing theories, based on the idea of evolution of the universe.
Radio galaxies form subspecies of galaxies with active galactic nucleus, which are particularly bright in radio wavelengths of the electromagnetic spectrum. In general they are very massive elliptical galaxies with supermassive black hole at the center. Radio galaxies are usually divided into two categories, Fanaroff - Riley type I (FR I) and Fanaroff-Riley type II (FR II). The categories are named by scientists in 1974th which proposed distribution of radio galaxies based on differences in morphology. FR I sources are the brightest in its central part (central core and inner jet region), while the largest part of the gloss FR II sources comes from the outer parts of radio galaxies (from an expanded area of diffuse radiation and hot spots).
Radio galaxies are of great importance in astrophysical and cosmological research as they are highly suitable for observation. A powerful radio sources can be detected in relatively short exposure time and at very large distances, for which observations in the optical or X-ray region is almost impossible because it scatters radiation passing through areas filled with dust and gas on the way to us.

You Might Also Like :

Back to Featured Articles on Logo Paperblog

These articles might interest you :

  • Dwarf Galaxies

    In the immediate neighborhood of our Galaxy system a few more small satellite galaxies was found, the so-called elliptical spheroids that can be considered as... Read more

    By  Gabe12logan
  • Local Group Of Galaxies

    The local group is relatively small cluster of galaxies and our galaxy is a part of local group. It consists of two dozen galaxies, but most are "dwarf"... Read more

    By  Gabe12logan
  • The Fastest Radio Controlled Jet Aircraft You've Ever Seen

    Hans Litjens from the Netherlands built this radio controlled jet aircraft powered by a Jetcat P160 SE. It has been lasered at 586 kph (366 mph). Read more

    By  Gerard
  • Outro’s Tips for 2011: Sounds Under Radio

    Outro’s Tips 2011: Sounds Under Radio

    Sounds under radioYou know the way all those English bands do the same generic rhythmic drumming, progressively escalating guitars before reaching a crecendo an... Read more

    By  Outroversion
  • Honesty in Radio

    Honesty Radio

    You’ve got to be honest with yourself when you write a script.Take out a stopwatch. Don’t rush your read. Allow for breathing room. Fix what’s not working. (Tha... Read more

    By  Happygrc
  • Our CBS Radio News Man in Berlin Endures an Air Raid

    Radio News Berlin Endures Raid

    One of the best sources of information about daily life in the Third Reich is Assignment to Berlin by Harry W. Flannery, a CBS Radio Correspondent sent to Berli... Read more

    By  Sfalcont
  • I Heard Alec Baldwin on My Radio This Morning During Michigan...

    Heard Alec Baldwin Radio This Morning During Michigan...

    I heard Alec Baldwin on my radio this morning during Michigan Radio’s Spring Pledge Drive. There is quite a collection of promos he has done- Alec Baldwin NPR... Read more

    By  Chelseajmartin

Paperblog Hot Topics