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The emission line galaxy TV Reticuli - Evidence for an ultraluminous supernova

2007; EDP Sciences; Volume: 461; Issue: 3 Linguagem: Inglês

1432-0746

L. Schmidtobreick, C. Tappert, H. Horst, I. Saviane, C. Lidman,

Astrophysics and Cosmic Phenomena

Aims. TV Ret was classified as a cataclysmic variable due to an outbu rst observed in 1977. We intended to confirm this classificati on and derive some basic properties of the system. Methods. Low resolution optical spectra were obtained for a spectral classification of the object. Results. We find that the object is not a cataclysmic variable but an emi ssion line galaxy with a redshift z = 0.0964. An R‐image taken in very good seeing conditions shows that the object is extended. Conclusions. We show that TV Ret is a blue dwarf galaxy, probably compact, with an absolute magnitude of MB =−17.5, a metallicity of 0.12 solar, and an average temperature of 1.3� 10 4 K. The line ratios place it among the H II galaxies, although close to the border of the Seyfert 2s. The outburst, which was observed in 1977, could thus be explained by a supernova explosion. However, with an absolute magnitude around MB =−21, it was an extremely bright one.