Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p...4a&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
We present new results on the star-formation history (SFH) of NGC 1569, derived using the synthetic Color-Magnitude Diagram method (CMD). The data have been obtained using Hubble Space Telescope NICMOS/NIC2 in the F110W and F160W near-infrared filters. The best fit to the data is obtained assuming 3 episodes of activity in the last 1 - 2 Gyr and a Salpeter IMF. The most recent and strongest (3.2 M&sun; yr-1 kpc-2) episode started 37 Myr ago and ended 13 Myr ago. A previous episode produced stars between ˜ 150 Myr and ˜ 40 Myr ago, with a mean star-formation rate (SFR) about 2/3 lower than the mean SFR of the youngest episode. An older star-formation episode occurred about 1 Gyr ago. All of these SFRs are 2-3 orders of magnitude higher than those derived for late-type dwarfs in the Local Group. We cannot rule out a low SFR in the past > 1 Gyr but we can safely conclude that the last 1-2 Gyr have been peculiar.
Aloisi Alessandra
Angeretti L.
Greggio Laura
Leitherer Claus
Sabbi Elena
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