Triggered star formation and the creation of the supergiant H 1 in shell in IC 2574
Abstract
Based on deep imaging from the Advanced Camera for Surveys aboard the Hubble Space Telescope (HST), we present new evidence that stellar feedback created a ~1 kpc supergiant H I shell (SGS) and triggered star formation (SF) around its rim in the M81 Group dwarf irregular galaxy IC 2574. Using photometry of the resolved stars from the HST images, we measure the star formation history of a region including the SGS, focusing on the past 500 Myr, and employ the unique properties of blue helium-burning stars to create a movie of SF in the SGS. We find two significant episodes of SF inside the SGS from 200-300 Myr and ~25 Myr ago. Comparing the timing of the SF events to the dynamic age of the SGS and the energetics from the H I and SF, we find compelling evidence that stellar feedback is responsible for creating the SGS and triggering secondary SF around its rim.
Additional Information
© 2009. The American Astronomical Society. Received 2008 November 17; accepted 2008 December 10; published 2009 January 7. Print publication: Issue 1 (2009 January 20). Support for this work was provided by NASA through grants GO-9755 and GO-10605 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555. Support is also provided by NRAO, which is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation. D.R.W. is grateful for support from a Penrose Fellowship. E.D.S. is grateful for partial support from the University of Minnesota. This research has made use of NASA's Astrophysics Data System Bibliographic Services and the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Jürgen Ott is a Jansky Fellow of the National Radio Astronomy Observatory.Attached Files
Published - WEIapjl09.pdf
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Additional details
- Eprint ID
- 12955
- Resolver ID
- CaltechAUTHORS:WEIapjl09
- GO-9755
- NASA
- GO-10605
- NASA
- NAS5-26555
- NASA
- National Radio Astronomy Observatory
- NSF
- University of Minnesota
- Space Telescope Science Institute
- Created
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2009-01-10Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field