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

D.R. Weisz; E.D. Skillman; J. Cannon; F. Walter; E. Brinks; J. Ott; A.E. Dolphin

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

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

D.R. Weisz, E.D. Skillman, J. Cannon, F. Walter, E. Brinks, J. Ott, A.E. Dolphin

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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.

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

Keywords

irregular galaxy sextans
Holmberg-II

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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 HI 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 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.",

keywords = "irregular galaxy sextans, Holmberg-II",

author = "D.R. Weisz and E.D. Skillman and J. Cannon and F. Walter and E. Brinks and J. Ott and A.E. Dolphin",

note = "Original article can be found at: http://www.iop.org/EJ/journal/apjl Copyright American Astronomical Society. DOI: 10.1088/0004-637x/691/1/L59 [Full text of this article is not available in the UHRA]",

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language = "English",

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

AU - Weisz, D.R.

AU - Skillman, E.D.

AU - Cannon, J.

AU - Walter, F.

AU - Brinks, E.

AU - Ott, J.

AU - Dolphin, A.E.

N1 - Original article can be found at: http://www.iop.org/EJ/journal/apjl Copyright American Astronomical Society. DOI: 10.1088/0004-637x/691/1/L59 [Full text of this article is not available in the UHRA]

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 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.

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 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.

KW - irregular galaxy sextans

KW - Holmberg-II

U2 - 10.1088/0004-637x/691/1/L59

DO - 10.1088/0004-637x/691/1/L59

M3 - Article

SN - 0004-637X

VL - 691

SP - L59-L62

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

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

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Keywords

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