Multifrequency VLA observations of PKS 0745 - 191 - The archetypal 'cooling flow' radio source?

Details Multifrequency VLA observations of PKS 0745 - 191 - The archetypal 'cooling flow' radio source? Multifrequency VLA observations of PKS 0745 - 191 - The archetypal 'cooling flow' radio source?

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..737b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, June 15, 1991, p. 737-749.

Astronomy and Astrophysics

Astrophysics

53

Cooling Flows (Astrophysics), Radio Sources (Astronomy), Very Large Array (Vla), Centimeter Waves, Galactic Clusters

Scientific paper

Ninety-, 20-, 6- and 2-cm VLA observations of the high-radio-luminosity cooling-flow radio source PKS 0745 - 191 are presented. The radio source was found to have a core with a very steep spectrum (alpha is approximately -1.5) and diffuse emission with an even steeper spectrum (alpha is approximately -1.5 to -2.3) without clear indications of the jets, hotspots, or double lobes found in the other radio sources of comparable luminosity. It is inferred that the energy to power the radio source comes from the central engine, but the source's structure may be heavily influenced by the past history of the galaxy and the inflowing intracluster medium. It is shown that, while the radio source is energetically unimportant for the cluster as a whole, it is important on the scale of the cooling flow. The mere existence of cosmic rays and magnetic fields within a substantial fraction of the volume inside the cooling radius has important consequences for cooling-flow models.

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