2010A&A...517L...8R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.09CEST06:51:43

2010A&A...517L...8R - Astronomy and Astrophysics, volume 517, L8-8 (2010/7-1)

Hanny's Voorwerp. Evidence of AGN activity and a nuclear starburst in the central regions of IC 2497.

RAMPADARATH H., GARRETT M.A., JOZSA G.I.G., MUXLOW T., OOSTERLOO T.A., PARAGI Z., BESWICK R., VAN ARKEL H., KEEL W.C. and SCHAWINSKI K.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: ISM - galaxies: individual: IC 2497 - galaxies: star formation

Nomenclature: Text, Figs 1-3, Table 2: [RGJ2010] CN (Nos C1-C2).

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 2497 G 09 41 04.076 +34 43 58.57           ~ 45 1
2 [RGJ2010] C1 Rad 09 41 04.090 +34 43 57.82           ~ 2 0
3 [RGJ2010] C2 Rad 09 41 04.100 +34 43 58.02           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.07.09-06:51:43

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