Library of Congress Cataloging-in-Publication Data Third reference catalogue of bright galaxies / Gerard de Vaucouleurs ... [et al.].p. cm. Includes bibliographical references. Contents: v. 1. Introduction, references, notes, and appendicesv.2. Data for galaxies between Oh and 12h -v.3. Data for galaxies between 12h and 24h.

Library of Congress Cataloging-in-Publication Data Third reference catalogue of bright galaxies / Gerard de Vaucouleurs ... let al.l. p. cm. Includes bibliographical references. Contents: v. 1. Introduction, references, notes, and appendicesv.2. Data for galaxies between Oh and 12h -v.3. Data for galaxies between 12h and 24h.

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Abstract. We present the new catalog of principal galaxies (PGC2003). It constitutes the framework of the HYPERLEDA database that supersedes the LEDA one, with more data and more capabilities. The catalog is still restricted to confirmed galaxies, i.e. about one million galaxies, brighter than ≈18 B-mag. In order to provide the best possible identification for each galaxy we give: accurate coordinates (typical accuracy better than 2 arcsec), diameter, axis ratio and position angle. Diameters and axis ratios have been homogenized to the RC2 system at the limiting surface brightness of 25B − mag arcsec −2 , using a new method, the EPIDEMIC method. In order to provide the best designation for each galaxy, we collected the names from 50 catalogues. The compatibility of the spelling is tested against NED and SIMBAD, and, as far as possible we used a spelling compatible with both. For some cases, where no consensus exists between NED, SIMBAD and LEDA, we propose some changes that could make the spelling of names fully compatible. The full catalog is distributed through the CDS and can be extracted from HYPERLEDA.

Abstract. This paper presents 2112 new 21-cm neutral hydrogen line measurements carried out with the meridian transit Nançay radiotelescope. Among these data we give also 213 new radial velocities which complement those listed in three previous papers of this series. These new measurements, together with the HI data collected in LEDA, put to 6 700 the number of galaxies with 21-cm line width, radial velocity, and apparent diameter in the so-called KLUN sample.

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Abstract. After a compilation of HI data from 611 references and new observations made in Nançay, we produce a catalog of homogenized HI data for 16781 galaxies. The homogenization is made using the EPIDEMIC method from which all data are progressively converted into the adopted standard. The result is a catalog giving: 1) the logarithm of twice the maximum rotation velocity, log 2V

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