A search for steep low-frequency radio spectra among quasars and clusters of galaxies

Details A search for steep low-frequency radio spectra among quasars and clusters of galaxies A search for steep low-frequency radio spectra among quasars and clusters of galaxies

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..46..429g&link_type=abstract

Astrophysics and Space Science, vol. 46, Feb. 1977, p. 429-441.

Astronomy and Astrophysics

Astronomy

6

Galactic Clusters, Quasars, Radio Sources (Astronomy), Radio Spectra, Cosmology, Luminous Intensity, Radiant Flux Density, Radio Galaxies, Red Shift

Scientific paper

Using published flux densities at low frequencies, radio spectra were constructed for 3C, 4C, and 4CT radio sources in Abell clusters of galaxies, radio galaxies outside Abell clusters, and quasars with known redshifts. About half the sources in rich Abell clusters have steep spectra between 38 and 178 MHz with spectral indices greater than 1.2. However, radio galaxies outside clusters have spectral indices not exceeding 1.2, and no steep spectra were found among 170 quasars. The radio sources in rich clusters are probably confined by intergalactic gas, and the steep spectra develop over a period of the order of 1 billion yr as relativistic electrons lose energy. The absence of steep spectra among quasars does not necessarily mean that quasars never occur in rich clusters of galaxies, since quasars are probably being observed only in their early high-luminosity phases. The possibility that some quasar events occur in the nuclei of the dominant cD galaxies in clusters is discussed, but quasar events may occur in more than one type of galaxy.

Affiliated with

Also associated with

No associations

Rating

A search for steep low-frequency radio spectra among quasars and clusters of galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A search for steep low-frequency radio spectra among quasars and clusters of galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A search for steep low-frequency radio spectra among quasars and clusters of galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-799148