EDP Sciences
Free access
Volume 386, Number 2, May I 2002
Page(s) 464 - 471
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20020291

A&A 386, 464-471 (2002)
DOI: 10.1051/0004-6361:20020291

Multi-wavelength study of IRAS 19254-7245 - The Superantennae

L. Vanzi1, S. Bagnulo1, E. Le Floc'h1, 2, R. Maiolino3, E. Pompei1 and W. Walsh4

1  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

(Received 13 November 2001 / 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 H 2.

Key words: galaxies: individual: IRAS 19254-7245 -- infrared: galaxies -- radio lines: galaxies -- galaxies: Seyfert

Offprint request: L. Vanzi, lvanzi@eso.org

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© ESO 2002