TRIGGERED STAR FORMATION AND THE CREATION OF THE SUPERGIANT Hi SHELL IN IC 2574

Daniel R. Weisz; Evan D. Skillman; John M. Cannon; Fabian Walter; Elias Brinks; Juergen Ott; Andrew E. Dolphin

doi:10.1088/0004-637X/691/1/L59

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TRIGGERED STAR FORMATION AND THE CREATION OF THE SUPERGIANT Hi SHELL IN IC 2574

Journal article

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TRIGGERED STAR FORMATION AND THE CREATION OF THE SUPERGIANT Hi SHELL IN IC 2574

Daniel R. Weisz, Evan D. Skillman, John M. Cannon, Fabian Walter, Elias Brinks, Juergen Ott and Andrew E. Dolphin

ASTROPHYSICAL JOURNAL LETTERS, Vol.691(1), pp.L59-L62

01/20/2009

DOI: 10.1088/0004-637X/691/1/L59

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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 similar to 1 kpc supergiant Hi 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 similar to 25 Myr ago. Comparing the timing of the SF events to the dynamic age of the SGS and the energetics from the Hi and SF, we find compelling evidence that stellar feedback is responsible for creating the SGS and triggering secondary SF around its rim.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: TRIGGERED STAR FORMATION AND THE CREATION OF THE SUPERGIANT Hi SHELL IN IC 2574
Creators: Daniel R. Weisz - University of Minnesota
Evan D. Skillman - University of Minnesota
John M. Cannon - Macalester College
Fabian Walter - Max Planck Institute for Astronomy
Elias Brinks - University of Hertfordshire
Juergen Ott - California Institute of Technology
Andrew E. Dolphin - RTX
Resource Type: Journal article
Publication Details: ASTROPHYSICAL JOURNAL LETTERS, Vol.691(1), pp.L59-L62
Publisher: Iop Publishing Ltd
DOI: 10.1088/0004-637X/691/1/L59
ISSN: 2041-8205
eISSN: 2041-8213
Number of pages: 4
Grant note: PP/D000920/1 / Science and Technology Facilities Council; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) ST/G002630/1 / STFC; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) NRAO Penrose Fellowship GO-9755; GO-10605 / Space Telescope Science Institute University of Minnesota; University of Minnesota System
Language: English
Date published: 01/20/2009
Academic Unit: Physics and Astronomy
Record Identifier: 9984627336602771

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