Revealing Hanny's Voorwerp : radio observations of IC 2497

@article{Jzsa2009RevealingHV,
  title={Revealing Hanny's Voorwerp : radio observations of IC 2497},
  author={Gyula I. G. J{\'o}zsa and Michael A. Garrett and Tom Oosterloo and H Rampadarath and Zsolt Paragi and Hanny van Arkel and Chris J. Lintott and William C. Keel and Kevin Schawinski and Edd Edmondson},
  journal={Astronomy and Astrophysics},
  year={2009},
  volume={500}
}
We present multi-wavelength radio observations in the direction of the spiral galaxy IC 2497 and the neighbouring emission nebula known as "Hanny's Voorwerp". Our WSRT continuum observations at 1.4 GHz and 4.9 GHz reveal the presence of extended emission at the position of the nebulosity, although the bulk of the emission remains unresolved at the centre of the galaxy. e-VLBI 1.65 GHz observations show that on the milliarcsecond-scale, a faint central compact source is present in IC 2497 with a… 

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