Volume 386, Number 2, May I 2002
|Page(s)||464 - 471|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 May 2002|
Multi-wavelength study of IRAS 19254-7245 – The Superantennae*
European Southern Observatory (ESO), Alonso de Cordova 3107, Santiago, Chile
2 present address CEA, Service d'Astrophysique, 91191 Gif-sur-Yvette, France
3 Osservatorio di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
4 Harvard Smithsonian Center for Astrophysics, 60 Garden St, MS 12, Cambridge, MA 02138, USA
Corresponding author: L. Vanzi, firstname.lastname@example.org
Accepted: 19 February 2002
We present observations in the optical, near-infrared and millimetre bands of the Ultraluminous Infrared galaxy IRAS 19254-7245, also known as “The Superantennae”. This galaxy is an interacting system with a double nucleus and long tails extending for about 350 kpc. We studied in detail the southern component of the system which is optically classified as a Sy2 galaxy. We have developed a method to determine the parameters of the emission lines in a spectrum in the case of multiple components and severe blending. Our data allow us to build a picture of the environment around the nucleus of the galaxy with unprecedented detail. The optical lines show a complex dynamical structure that is not observable in the near-infrared. In addition we find typical features of AGN such as the coronal lines of [FeVII]5721 and [SiVI]1.96. We also detect strong emission from [FeII]1.64 and H2.
Key words: galaxies: individual: IRAS 19254-7245 / infrared: galaxies / radio lines: galaxies / galaxies: Seyfert
© ESO, 2002
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