HI observations of nearby galaxies V. Narrow (HI) line galaxies^*

¹ Max-Plank-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
² Special Astrophysical Observatory, Russian Academy of Sciences, N.Arkhyz, KChR 369167, Russia
³ Astronomical Observatory of Kiev University, Observatorna, 3, 04053 Kiev, Ukraine

Corresponding author: W. K. Huchtmeier, huchtmeier@mpifr-bonn.mpg.de

Received: 17 December 2002
Accepted: 22 January 2003

Abstract

In this paper we present new HI observations with high velocity resolution for 104 nearby narrow-line galaxies with half power line widths smaller than 50 km s^-1 most of which are well approximated by a Gaussian. The FWHM line width of 30 of these integrated HI profiles is less than 25 km s^-1. We present global parameters of these nearby galaxies and discuss the size dependence, the luminosity dependence, and the dependence of these parameters with the observed line width. Our sample essentially is a subsample of the Local Volume (i.e. galaxies within 10 Mpc) with declinations ≥-30° and only a few galaxies at greater distances. It is described by the following median values of global physical parameters: total absolute blue magnitude ; linear diameter  kpc (this corresponds to the de Vaucouleurs diameter D₂₅); half power line width  km s^-1; total HI mass ; distance  Mpc; HI mass-to-luminosity ratio ; total mass-to luminosity ratio .