Massive star formation and superwinds in IRAS 19254 - 7245 (the 'Superantennae')

Details Massive star formation and superwinds in IRAS 19254 - 7245 (the 'Superantennae') Massive star formation and superwinds in IRAS 19254 - 7245 (the 'Superantennae')

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..113c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 113-121. Research supported by CONICET.

Astronomy and Astrophysics

Astronomy

46

Infrared Sources (Astronomy), Interacting Galaxies, Massive Stars, Quasars, Seyfert Galaxies, Star Formation, Stellar Winds, Astronomical Spectroscopy, Cosmic Dust, Emission Spectra, Gas Ionization, Infrared Astronomy Satellite, Line Spectra, Molecular Gases

Scientific paper

Aperture spectroscopy and images are used to investigate the ultraluminous IRAS galaxy IRAS 19254 - 7245. It shows the spectral characteristics of a Seyfert 2-type galaxy with the emission lines split into four independent kinematical components separated by a velocity of 1491 km/s. The optical morphology shows a distorted main body composed of two differentiated nuclei separated by about 10 kpc while two long tails extending over a total size of 305 kpc in projection are also detected. The measured amounts of cold gas and dust together with the extraordinarily large size of the tails indicate that IRAS 19254 - 7245 is the merger of two almost equally massive gas-rich spiral galaxies and that the merger process started 10 to the 9th yr ago. The amount and energy distribution of the ionizing photons generated in the star formation process are found to be sufficient to account for the large infrared and H-alpha luminosities, while the shape of the spectrum is not hard enough to explain the Seyfert 2-type excitation conditions.

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