Astron. Astrophys. Suppl. Ser. 135, 429-436

Look-alike galaxies:

HI observations for look-alike galaxies of four calibrators

L. Bottinelli¹² - L. Gouguenheim¹² - G. Theureau³ - N. Coudreau² - G. Paturel⁴

Send offprint request: G. Paturel

1 - 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

Received August 17; accepted November 16, 1998

Abstract:

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