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.
Description
Hanny's Voorwerp: Evidence of AGN activity and a
nuclear starburst in the central regions of IC 2497
%0 Generic
%1 rampadarath-hannys-voorwerp-2010
%A Rampadarath, H.
%A Garrett, M. A.
%A Józsa, G. I. G.
%A Muxlow, T.
%A Oosterloo, T. A.
%A Paragi1, Z.
%A Beswick, R.
%A van Arkel, H.
%A Keel, W. C.
%A Schawinski, K.
%D 2010
%K astronomy astrophysics galaxy hannys voorwerp zoo
%T Hanny's Voorwerp: Evidence of AGN activity and a
nuclear starburst in the central regions of IC 2497
%U http://arxiv.org/abs/1006.4096
%X 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.
@misc{rampadarath-hannys-voorwerp-2010,
abstract = {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.},
added-at = {2013-09-18T16:58:42.000+0200},
author = {Rampadarath, H. and Garrett, M. A. and Józsa, G. I. G. and Muxlow, T. and Oosterloo, T. A. and Paragi1, Z. and Beswick, R. and van Arkel, H. and Keel, W. C. and Schawinski, K.},
biburl = {https://www.bibsonomy.org/bibtex/220412c8865e70e08054172375098beb4/mhwombat},
description = {Hanny's Voorwerp: Evidence of AGN activity and a
nuclear starburst in the central regions of IC 2497},
interhash = {8b845c8a7d0dd8a5d284b99c606cb188},
intrahash = {20412c8865e70e08054172375098beb4},
keywords = {astronomy astrophysics galaxy hannys voorwerp zoo},
note = {cite arxiv:1006.4096Comment: 5 pages, 3 figures, A\&A
letter accepted on 17/06/2010},
timestamp = {2016-07-12T19:25:30.000+0200},
title = {Hanny's Voorwerp: Evidence of {AGN} activity and a
nuclear starburst in the central regions of {IC} 2497},
url = {http://arxiv.org/abs/1006.4096},
year = 2010
}