| Issue |
A&A
Volume 423, Number 1, August III 2004
|
|
|---|---|---|
| Page(s) | 57 - 64 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20035783 | |
| Published online | 29 July 2004 | |
Detection of a radio halo in the Virgo cluster*
1
CDS, Observatoire astronomique de Strasbourg, UMR 7550, 11 rue de l'université, 67000 Strasbourg, France e-mail: bvollmer@astro.u-strasbg.fr
2
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Received:
2
December
2003
Accepted:
25
March
2004
New Effelsberg 1.4 GHz observations of the central 
of the Virgo cluster
are presented. NVSS data are used to subtract point sources from our map.
During the data reduction process special care is taken (i) to disentangle emission from the
North Polar Spur from emission from the Virgo cluster, (ii) to disentangle emission from the strong
M 87 sidelobes
from emission from the Virgo cluster, and (iii) to correct for non-linear ground emission due to
the long scans. We detect a low surface brightness radio halo with a flux density of
Jy centered close to the
elliptical galaxy M 86. This halo is much weaker than that observed in the Coma cluster.
It is reminiscent of a past interaction between the intracluster medium of M 86 and
a low density gas, belonging most probably to the Virgo cluster.
Key words: galaxies: clusters: individual: Virgo / galaxies: intergalactic medium / radio continuum: general
© ESO, 2004
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