Astron. Astrophys. Suppl. Ser. 141, 469-490

HI observations of nearby galaxies

I. The first list of the Karachentsev catalog

W.K. Huchtmeier ¹ - I.D. Karachentsev ² - V.E. Karachentseva ³ - M. Ehle ⁴

Send offprint request: W.K. Huchtmeier,
e-mail: huchtmeier@mpifr-bonn.mpg.de

1 - Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
2 - Special Astrophysical Observatory, Russian Academy of Sciences, N. Arkhyz, KChR, 357147, Russia
3 - Astronomical Observatory of Kiev University, Kiev, Ukraine
4 - Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstraße, D-85740 Garching bei München, Germany

Received September 14; accepted November 16, 1999

Abstract:

We present HI observations of the galaxies in the first list of the Karachentsev catalog of previously unknown nearby dwarf galaxies (Karachentseva & Karachentsev 1998). This survey covers all known nearby galaxy groups within the Local Volume (i.e. within 10 Mpc) and their environment, that is about 25% of the total sky. A total of 257 galaxies have been observed with a detection rate of 60%. We searched a frequency band corresponding to heliocentric radial velocities from -470 kms^-1 to $\sim$+4000 kms^-1. Non-detections are either due to limited coverage in radial velocity, confusion with Local HI (mainly in the velocity range -140kms^-1 to +20 kms^-1), or lack of sensitivity for very weak emission. 25% of the detected galaxies are located within the Local Volume. Those galaxies are dwarf galaxies judged by their optical linear diameter (1.4 $\pm$0.2 kpc on the average), their mean total HI mass (4.6 10⁷$M_{\odot}$), and their observed linewidths (39 kms^-1).

Key words: galaxies: distances and redshifts; dwarf; fundamental parameters; general