Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-03
Astron.Astrophys. 414 (2004) 23-43
Astronomy and Astrophysics
Astrophysics
28 pages, 19 figures. Accepted for publication in Astronomy and Astrophysics. FITS-format R-band and H alpha plus [NII] images
Scientific paper
10.1051/0004-6361:20031568
We discuss the selection and observations of a large sample of nearby galaxies, which we are using to quantify the star formation activity in the local Universe. The sample consists of 334 galaxies across all Hubble types from S0/a to Im and with recession velocities of between 0 and 3000 km/s. The basic data for each galaxy are narrow band H alpha plus [NII] and R-band imaging, from which we derive star formation rates, H alpha plus [NII] equivalent widths and surface brightnesses, and R-band total magnitudes. A strong correlation is found between total star formation rate and Hubble type, with the strongest star formation in isolated galaxies occurring in Sc and Sbc types. More surprisingly, no significant trend is found between H alpha plus [NII] equivalent width and galaxy R-band luminosity. More detailed analyses of the data set presented here will be described in subsequent papers.
Beckman John E.
Cardwell Andrew
Collins Charles Aloysius
de Jong Roelof S.
Etherton Jason
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