LOFAR and APERTIF Surveys of the Radio Sky: Probing Shocks and Magnetic Fields in Galaxy Clusters
Artikel i vetenskaplig tidskrift, 2011
At very low frequencies, the new pan-European radio telescope LOFAR is opening the last unexplored window of the electromagnetic spectrum for astrophysical studies. The revolutionary APERTIF-phased arrays that are about to be installed on the Westerbork radio telescope (WSRT) will dramatically increase the survey speed for the WSRT. Combined surveys with these two facilities will deeply chart the northern sky over almost two decades in radio frequency from similar to 15 up to 1400 MHz. Here we briefly describe some of the capabilities of these new facilities and what radio surveys are planned to study fun-damental issues related to the formation and evolution of galaxies and clusters of galaxies. In the second part we briefly review some recent observational results directly showing that diffuse radio emission in clusters traces shocks due to cluster mergers. As these diffuse radio sources are relatively bright at low frequencies, LOFAR should be able to detect thousands of such sources up to the epoch of cluster formation. This will allow addressing many question about the origin and evolution of shocks and magnetic fields in clusters. At the end we briefly review some of the first and very preliminary LOFAR results on clusters.
radio continuum:
abell 2256
galaxies
halos
intracluster medium
emission
1.4 ghz
Galaxies: clusters: general
radio telescopes
Författare
H. Rottgering
Universiteit Leiden
J. Afonso
Universidade de Lisboa
P. D. Barthel
Rijksuniversiteit Groningen
Fabien Batejat
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
P. Best
Royal Observatory
A. Bonafede
Jacobs University Bremen
M. Brüggen
Jacobs University Bremen
G. Brunetti
Istituto di Radioastronomia
K. Chyzy
Uniwersytet Jagiellonski w Krakowie
John Conway
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
F. De Gasperin
Max-Planck-Gesellschaft
C. Ferrari
Observatoire de la Cote d'Azur
M. Haverkorn
Universiteit Leiden
Radboud Universiteit
Netherlands Institute for Radio Astronomy (ASTRON)
G. Heald
Netherlands Institute for Radio Astronomy (ASTRON)
M. Hoeft
Thüringer Landessternwarte Tautenburg
N. Jackson
University of Manchester
M.J. Jarvis
University of Hertfordshire
L. Ker
Royal Observatory
M. Lehnert
Observatoire de Paris-Meudon
G. Macario
Istituto di Radioastronomia
J. McKean
Netherlands Institute for Radio Astronomy (ASTRON)
G. Miley
Universiteit Leiden
R. Morganti
Netherlands Institute for Radio Astronomy (ASTRON)
Rijksuniversiteit Groningen
T. Oosterloo
Netherlands Institute for Radio Astronomy (ASTRON)
Rijksuniversiteit Groningen
E. Orru
Radboud Universiteit
R. Pizzo
Netherlands Institute for Radio Astronomy (ASTRON)
D. Rafferty
Universiteit Leiden
A. Shulevski
Rijksuniversiteit Groningen
C. Tasse
Observatoire de Paris-Meudon
I. van Bemmel
Netherlands Institute for Radio Astronomy (ASTRON)
B. van der Tol
Universiteit Leiden
R. van Weeren
Universiteit Leiden
M. Verheijen
Rijksuniversiteit Groningen
G. White
Open University
M. Wise
Netherlands Institute for Radio Astronomy (ASTRON)
Journal of Astrophysics and Astronomy
0250-6335 (ISSN)
Vol. 32 4 557-566Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1007/s12036-011-9129-x