HI observations for look-alike galaxies of four calibrators
Université Paris-Sud, F-91405 Orsay, France
2 Observatoire de Paris-Meudon, URA 1757, F-92195 Meudon Principal Cedex, France
3 Osservatorio di Capodimonte, via Moiariello 16, I-80131 Napoli, Italy
4 CRAL-Observatoire de Lyon, UMR 5574, F-69230 Saint-Genis Laval, France
Send offprint request to: G. Paturel
Accepted: 16 November 1998
We present a programme aiming at applying the Tully-Fisher relation for galaxies with the same morphological 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 Nançay (France) for sosies of four calibrators NGC 224, NGC 3031, NGC 253 and NGC 5457. 82 galaxies were detected.
Key words: galaxies: general / radio lines: galaxies / astronomical data bases: miscellaneous / cosmology: distance scale
These observations made use of Nançay radiotelescope. The Nançay Radio Observatory is the Unité scientifique de Nançay of the Observatoire de Paris,associated as Unité de Service et de Recherche (USR) No. B704 to the French Centre National de la Recherche Scientifique (CNRS). The Nançay Observatory also acknowledges the financial support of the Conseil Régional of the Région Centre in France.
© European Southern Observatory (ESO), 1999