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Title: THE NATURE OF STARBURSTS. III. THE SPATIAL DISTRIBUTION OF STAR FORMATION

Abstract

We map the spatial distribution of recent star formation over a few Multiplication-Sign 100 Myr timescales in 15 starburst dwarf galaxies using the location of young blue helium burning stars identified from optically resolved stellar populations in archival Hubble Space Telescope observations. By comparing the star formation histories from both the high surface brightness central regions and the diffuse outer regions, we measure the degree to which the star formation has been centrally concentrated during the galaxies' starbursts, using three different metrics for the spatial concentration. We find that the galaxies span a full range in spatial concentration, from highly centralized to broadly distributed star formation. Since most starbursts have historically been identified by relatively short timescale star formation tracers (e.g., H{alpha} emission), there could be a strong bias toward classifying only those galaxies with recent, centralized star formation as starbursts, while missing starbursts that are spatially distributed.

Authors:
;  [1]; ; ;  [2];  [3];  [4];  [5]
  1. Minnesota Institute for Astrophysics, School of Physics and Astronomy, 116 Church Street, S.E., University of Minnesota, Minneapolis, MN 55455 (United States)
  2. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States)
  3. Department of Physics and Astronomy, Macalester College, 1600 Grand Avenue, Saint Paul, MN 55105 (United States)
  4. Raytheon Company, 1151 E. Hermans Road, Tucson, AZ 85756 (United States)
  5. Department of Astronomy, New Mexico State University, Box 30001-Department 4500, 1320 Frenger Street, Las Cruces, NM 88003 (United States)
Publication Date:
OSTI Identifier:
22086456
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; BRIGHTNESS; GALACTIC EVOLUTION; GALAXIES; HELIUM BURNING; PHOTON EMISSION; SPATIAL DISTRIBUTION; STAR EVOLUTION; STARS; TELESCOPES

Citation Formats

McQuinn, Kristen B. W., Skillman, Evan D., Dalcanton, Julianne J., Weisz, Daniel R., Williams, Benjamin F., Cannon, John M., Dolphin, Andrew E., and Holtzman, Jon, E-mail: kmcquinn@astro.umn.edu. THE NATURE OF STARBURSTS. III. THE SPATIAL DISTRIBUTION OF STAR FORMATION. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/77.
McQuinn, Kristen B. W., Skillman, Evan D., Dalcanton, Julianne J., Weisz, Daniel R., Williams, Benjamin F., Cannon, John M., Dolphin, Andrew E., & Holtzman, Jon, E-mail: kmcquinn@astro.umn.edu. THE NATURE OF STARBURSTS. III. THE SPATIAL DISTRIBUTION OF STAR FORMATION. United States. doi:10.1088/0004-637X/759/1/77.
McQuinn, Kristen B. W., Skillman, Evan D., Dalcanton, Julianne J., Weisz, Daniel R., Williams, Benjamin F., Cannon, John M., Dolphin, Andrew E., and Holtzman, Jon, E-mail: kmcquinn@astro.umn.edu. Thu . "THE NATURE OF STARBURSTS. III. THE SPATIAL DISTRIBUTION OF STAR FORMATION". United States. doi:10.1088/0004-637X/759/1/77.
@article{osti_22086456,
title = {THE NATURE OF STARBURSTS. III. THE SPATIAL DISTRIBUTION OF STAR FORMATION},
author = {McQuinn, Kristen B. W. and Skillman, Evan D. and Dalcanton, Julianne J. and Weisz, Daniel R. and Williams, Benjamin F. and Cannon, John M. and Dolphin, Andrew E. and Holtzman, Jon, E-mail: kmcquinn@astro.umn.edu},
abstractNote = {We map the spatial distribution of recent star formation over a few Multiplication-Sign 100 Myr timescales in 15 starburst dwarf galaxies using the location of young blue helium burning stars identified from optically resolved stellar populations in archival Hubble Space Telescope observations. By comparing the star formation histories from both the high surface brightness central regions and the diffuse outer regions, we measure the degree to which the star formation has been centrally concentrated during the galaxies' starbursts, using three different metrics for the spatial concentration. We find that the galaxies span a full range in spatial concentration, from highly centralized to broadly distributed star formation. Since most starbursts have historically been identified by relatively short timescale star formation tracers (e.g., H{alpha} emission), there could be a strong bias toward classifying only those galaxies with recent, centralized star formation as starbursts, while missing starbursts that are spatially distributed.},
doi = {10.1088/0004-637X/759/1/77},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}