Triggered star formation and the creation of the supergiant h i shell in IC 2574

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

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

Triggered star formation and the creation of the supergiant h i shell in IC 2574

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

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

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.

Original language	English (US)
Pages (from-to)	L59-L62
Journal	Astrophysical Journal
Volume	691
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/691/1/L59
State	Published - 2009

Keywords

Galaxies: ISM
Galaxies: dwarf
Galaxies: individual (IC 2574)
Galaxies: irregular
Stars: formation

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

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title = "Triggered star formation and the creation of the supergiant h i 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.",

keywords = "Galaxies: ISM, Galaxies: dwarf, Galaxies: individual (IC 2574), Galaxies: irregular, Stars: formation",

author = "Weisz, {Daniel R.} and Skillman, {Evan D.} and Cannon, {John M.} and Fabian Walter and Elias Brinks and J{\"u}rgen Ott and Dolphin, {Andrew E.}",

year = "2009",

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T1 - Triggered star formation and the creation of the supergiant h i shell in IC 2574

AU - Weisz, Daniel R.

AU - Skillman, Evan D.

AU - Cannon, John M.

AU - Walter, Fabian

AU - Brinks, Elias

AU - Ott, Jürgen

AU - Dolphin, Andrew E.

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

KW - Galaxies: ISM

KW - Galaxies: dwarf

KW - Galaxies: individual (IC 2574)

KW - Galaxies: irregular

KW - Stars: formation

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VL - 691

SP - L59-L62

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Triggered star formation and the creation of the supergiant h i shell in IC 2574

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Keywords

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