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Issue A&A
Volume 446, Number 3, February II 2006
Page(s) 839 - 845
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20053843

A&A 446, 839-845 (2006)
DOI: 10.1051/0004-6361:20053843

H$\alpha$ surface photometry of galaxies in nearby clusters

V. The survey completion
G. Gavazzi1, A. Boselli2, L. Cortese1, 2, I. Arosio1, A. Gallazzi3, P. Pedotti1 and L. Carrasco4

1  Università degli Studi di Milano-Bicocca, Piazza delle scienze 3, 20126 Milano, Italy
    e-mail: giuseppe.gavazzi@mib.infn.it
2  Laboratoire d'Astrophysique de Marseille, BP8, Traverse du Siphon, 13376 Marseille Cedex 12, France
3  Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching bei München, Germany
4  Instituto Nacional de Astrofísica, Optica y Electrónica, Apartado Postal 51. CP 72000 Puebla, Pue., México

(Received 18 July 2005 / Accepted 12 September 2005 )

Abstract
We present the H$\alpha$ imaging observations of 273 late-type galaxies in the nearby rich galaxy clusters Virgo, A 1367, Coma, Cancer, Hercules and in the Great Wall, carried out primarily with the 2.1 m telescope of the San Pedro Martir Observatory (SPM) and with the ESO/3.6 m telescope. We derived the H$\alpha$+[NII] fluxes and equivalent widths. The H$\alpha$ survey reached completion for an optically selected sample of nearby galaxies in and outside rich clusters. Taking advantage of the completeness of the data set, the dependence of H$\alpha$ properties on the Hubble type was determined for late-type galaxies in the Virgo cluster. Differences in the gaseous content partly account for the large scatter of the H$\alpha$ EW within each Hubble-type class. We studied the radial distributions of the H$\alpha$ EW around Coma+A 1367 and the Virgo clusters in two luminosity bins. Luminous galaxies show a decrease in their average H$\alpha$ EW in the inner ~1 virial radius, while low-luminosity galaxies do not show this trend.


Key words: galaxies: photometry -- galaxies: clusters: individual: Virgo, Coma, A 1367, Cancer

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© ESO 2006


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