Kinematics of the Local Universe XIII. 21-cm line measurements of 452 galaxies with the Nan\c{c}ay radiotelescope, JHK Tully-Fisher relation and preliminary maps of the peculiar velocity field

TL;DR

This study presents extensive 21-cm hydrogen line measurements of 452 galaxies, applying the Tully-Fisher relation across multiple bands to map the local universe's velocity field and improve distance estimates.

Contribution

It provides new HI data for 452 galaxies, enhances the Tully-Fisher relation application in three bands, and offers preliminary detailed maps of the local universe's peculiar velocity field.

Findings

New HI measurements for 452 galaxies

Derived galaxy distances using Tully-Fisher in JHK bands

Produced preliminary velocity field maps of the local universe

Abstract

This paper presents 452 new 21-cm neutral hydrogen line measurements carried out with the FORT receiver of the meridian transit Nan\c{c}ay radiotelescope (NRT) in the period April 2003 -- March 2005. This observational programme is part of a larger project aiming at collecting an exhaustive and magnitude-complete HI extragalactic catalogue for Tully-Fisher applications (the so-called KLUN project, for Kinematics of the Local Universe studies, end in 2008). The whole on-line HI archive of the NRT contains today reduced HI-profiles for ~4500 spiral galaxies of declination delta > -40° (http://klun.obs-nancay.fr). As an example of application, we use direct Tully-Fisher relation in three (JHK) bands in deriving distances to a large catalog of 3126 spiral galaxies distributed through the whole sky and sampling well the radial velocity range between 0 and 8000 km/s. Thanks to an iterative method accounting for selection bias and smoothing effects, we show as a preliminary output a detailed and original map of the velocity field in the Local Universe.