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Quasar Radio Morphology and Environment at z ≃ 1/2

Published online by Cambridge University Press:  25 May 2016

Travis A. Rector
Affiliation:
Center for Astrophysics and Space Astronomy University of Colorado - Boulder Boulder, CO 80309-0389 USA
John Stocke
Affiliation:
Center for Astrophysics and Space Astronomy University of Colorado - Boulder Boulder, CO 80309-0389 USA
Erica Ellingson
Affiliation:
Center for Astrophysics and Space Astronomy University of Colorado - Boulder Boulder, CO 80309-0389 USA

Abstract

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The radio morphology of thirty radio-loud quasars at z ≃ 1/2 is studied as a function of cluster galaxy density using data available in the literature. While correlations between several morphological parameters of the radio emission are consistent with interactions with an intracluster medium (ICM), we do not see the correlation between galaxy density and quasar radio morphology expected from ICM interaction. Therefore, distorted radio morphology is not an indicator for the presence of a distant cluster as previously suggested. Because such correlations are found at z ≃ 0, these results are suggestive that the rich clusters containing quasars at z ≃ 1/2 have not yet developed a dense ICM. An inelastic collision with neighboring galaxies and intergalactic clouds can account for the morphology of several of the sources in this sample and is a viable alternative explanation.

Type
Radio Sources and their Environment
Copyright
Copyright © Kluwer 1996