Look-alike galaxies: HI observations for look-alike galaxies of four calibrators

We present a programme aiming at applying the Tully-Fisher relation for galaxies with the same mor phological type and the same inclination (look-alike galaxies or sosie galaxies) as calibrating galaxies. The advantage of sosie galaxies is discussed. In particular, it is shown that using sosies of bright calibrators will allow us to explore the universe deeper and more efficiently than the classical TF method applied to different morphological types and different inclinations. As a preliminary part, we report in this paper new HI observations performed with the radiotelescope of Nancay (France) for sosies of four calibrators NGC 224, NGC 3031, NGC 253 and NGC 5457. 82 galaxies were detected.