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Title:
Spatialy Resolved Star Formation History Movies of 9 Dwarf Irregular Galaxies In The M81 Group.
Authors:
Weisz, Daniel R.; Skillman, E.; Cannon, J.; Dolphin, A.; Kennicutt, R.; Lee, J.; Walter, F.
Affiliation:
AA(Univ. of Minnesota), AB(Univ. of Minnesota), AC(Macalester College), AD(Raetheyon Coropration), AE(Univ. of Cambridge, United Kingdom), AF(OCIW), AG(MPIA-Heidelberg, Germany)
Publication:
American Astronomical Society, AAS Meeting #211, #95.19; Bulletin of the American Astronomical Society, Vol. 39, p.897
Publication Date:
12/2007
Origin:
AAS
Bibliographic Code:
2007AAS...211.9519W

Abstract

The role of 'feedback' i.e., supernovae, stellar winds, outflows, in the process of star formation (SF), interstellar medium (ISHM) structure alteration, and galaxy evolution remains an interesting and open question. One way to help define the role of feedback is through observational constraints. Recent HST/ACS observations of 9 dwarf irregular galaxies (dIrrs) in the M81 group will help characterize the spatial and temporal components of feedback in a set of diverse dIrrs, spanning a factor of 6 magnitudes in luminosity, 1000 in current star formation rate, and 0.5 dex in metallicity. Here, I present movies that trace the star formation activity in the recent ( 0.5 Gyrs) history of each M81 dI in our sample. I am able to see how star formation events relate to one another both in time and space. We are able to clearly see the SF duty cycle, periods of activity and quiescence, as well as how events may serve to trigger future events by their spatial and temporal proximity. The M81 dIrr SF movies provide us with unique insight into how stars form and how they impact the evolution of each galaxy. Support for this work is provided by NASA/HST grant GO-10605.01.
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