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Multifrequency VLA observations of PKS 0745 - 191 - The archetypal 'cooling flow' radio source?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.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Baum, S. A.
(Netherlands Foundation for Radio Astronomy Dwingelo, Netherlands)
O'Dea, C. P.
(ASTRON Dwingeloo, Netherlands)
Date Acquired
August 15, 2013
Publication Date
June 15, 1991
Publication Information
Publication: Royal Astronomical Society, Monthly Notices
Volume: 250
ISSN: 0035-8711
Subject Category
Accession Number
Funding Number(s)
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