Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-06-21
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
5 pages, 3 figures, A&A letter accepted on 17/06/2010
Scientific paper
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 18 cm, and the Multi-Element Radio Linked Interferometer Network (MERLIN) at 18 cm and 6 cm. We detect two compact radio sources, with brightness temperatures above 10e5 K, 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_solar) of 12.4 M_solar/yr. These results are in line with the hypothesis that the ionisation nebula "Hanny's Voorwerp" at a distance of approx. 15-25 kpc from the galaxy is ionised by the radiation cone of the AGN.
Arkel Hanny van
Beswick Rob
Garrett Mike A.
Jozsa Gyula I. G.
Keel William C.
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