The dwarf galaxy duty cycle: Measurements from a complete sample of the local volume

Details The dwarf galaxy duty cycle: Measurements from a complete sample of the local volume The dwarf galaxy duty cycle: Measurements from a complete sample of the local volume

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..37l&link_type=abstract

Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.

Astronomy and Astrophysics

Astrophysics

Scientific paper

With the goal of fully characterizing the star-formation properties of complete samples of galaxies in the local Universe, we have carried out an Hα and R-band imaging survey of a volume-limited sample of 340 spiral and irregular galaxies within a distance of 11 Mpc. In particular, we are using this dataset to understand the importance of starbursts in dwarf galaxies. We present preliminary results regarding the duty cycle of starbursts in low-luminosity galaxies through an analysis of the Scalo birth-rate ``b'' parameter, and constrain the fractional stellar mass formed during burst phases. General properties of the overall sample, with an emphasis on the survey's completeness, are also discussed. The snapshots of the ongoing star formation provided by our Hα imaging will be complemented by UV imaging through a recently approved GALEX Legacy program. The combined Hα and UV volume complete dataset, which will be built up over the next year, will provide a more robust measurement of the duty cycle, powerful constraints on the systematic errors in the inferred star formation related quantities, and also allow for the systematic investigation of the poorly understood star formation propagation mechanism in dwarf irregular galaxies.

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