EDP Sciences
Free access
Issue
A&A
Volume 384, Number 1, March II 2002
Page(s) 24 - 32
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011803


A&A 384, 24-32 (2002)
DOI: 10.1051/0004-6361:20011803

Large-scale star formation in galaxies

II. The spirals NGC 3377A, NGC 3507 and NGC 4394. Young star groupings in spirals
A. Vicari1, P. Battinelli2, R. Capuzzo-Dolcetta1, T. K. Wyder3 and G. Arrabito4

1  Dipart. di Fisica, Università La Sapienza, P.le A. Moro 5, Roma, Italy
2  Oss. Astronomico di Roma, Viale del Parco Mellini 84, Roma, Italy
3  California Inst. of Technology MC 405-47 1200 E. Cal. Blvd Pasadena, CA 91125, USA
4  Dipart. di Matematica, Università La Sapienza, P.le A. Moro 5, Roma, Italy

(Received 28 June 2001 / Accepted 23 November 2001 )

Abstract
The identification of young star groupings (YSG) in the three spiral galaxies NGC 3377A, NGC 3507, NGC 4394 is obtained by mean of the statistical method described in Paper I. We find 83, 90, 185 YSGs, respectively. An identification map of YSGs, as well as their size distribution, their B-luminosity function and their surface luminosity density radial behaviour are presented and compared. These data, in addition to those in Paper I, constitute a first sample suitable for seeking correlations among properties of galaxies and their YSGs, which we briefly discuss here.


Key words: galaxies: spiral -- galaxies: general -- galaxies: stellar content -- stars: formation -- methods: statistical

Offprint request: A. Vicari, alessandrovicari@uniroma1.it

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