SIMBAD references

We present high- and intermediate resolution radio observations of the central region in the spiral galaxy IC 2497, performed using the European VLBI Network (EVN) at 18cm, and the Multi-Element Radio Linked Interferometer Network (MERLIN) at 18cm and 6cm. We detect two compact radio sources, with brightness temperatures above 10⁵K, suggesting that they are related to AGN activity. We show that the total 18 cm radio emission from the galaxy is dominated neither by these compact sources nor large-scale emission, but extended emission confined within a sub-kpc central region. IC 2497 therefore appears as a typical luminous infrared galaxy that exhibits a nuclear starburst with a massive star formation rate (M>5M_☉) of 12.4M_☉/yr. These results are in line with the hypothesis that the ionisation nebula ``Hanny's Voorwerp'' at a distance of ∼15-25kpc from the galaxy is ionised by the radiation cone of the AGN.