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All-sky catalog of local radio galaxies

Published online by Cambridge University Press:  17 July 2013

S. van Velzen
Affiliation:
IMAPP, Radboud University, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands
H. Falcke
Affiliation:
IMAPP, Radboud University, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands ASTRON, Dwingeloo, The Netherlands Max-Planck-Institut für Radioastronomie Bonn, Germany
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Abstract

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The final episode in the history of black hole accretion and galaxy formation takes place in our cosmic backyard, the local universe. Within this volume must also reside the — until now unknown — sources of observed ultra-high energy cosmic rays (UHECRs). A thorough study of the local universe requires full-sky coverage to obtain a sizable sample and map the matter anisotropy. We recently constructed the first catalog of radio-emitting galaxies that meets this requirement. The sample contains all radio galaxies similar to Centaurus~A out to ~100 Mpc. Only 3% of the hosts of the powerful radio jets are classified as Spiral galaxies, while for non-radio galaxies of similar mass, this fraction is 34%. The energy injected by radio jets per unit volume indicates that Cen A-like radio galaxies have in principle sufficient power to accelerate cosmic rays to ultra-high energies. A significantly enhanced clustering of radio-loud galaxies compared to normal galaxies of the same luminosity is observed. This indicates a causal relation between galaxy environment and jet power, independent of black hole mass.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013 

References

van Velzen, S., Falcke, H., Schellart, P., & Nierstenhöfer, N., Kampert, K. H. 2012, A&A, 544, A18Google Scholar