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The Formation of Kiloparsec-scale HI Holes in Dwarf Galaxies

Warren, Steven R. and Weisz, Daniel R. and Skillman, Evan D. and Cannon, John M. and Dalcanton, Julianne J. and Dolphin, Andrew E. and Kennicutt, Robert C., Jr. and Koribalski, Bärbel and Ott, Jürgen and Stilp, Adrienne M. and Van Dyk, Schuyler D. and Walter, Fabian and West, Andrew A. (2011) The Formation of Kiloparsec-scale HI Holes in Dwarf Galaxies. Astrophysical Journal, 738 (1). Art. No. 10. ISSN 0004-637X.

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The origin of kpc-scale holes in the atomic hydrogen (H i) distributions of some nearby dwarf irregular galaxies presents an intriguing problem. Star formation histories (SFHs) derived from resolved stars give us the unique opportunity to study past star-forming events that may have helped shape the currently visible Hi distribution. Our sample of five nearby dwarf irregular galaxies spans over an order of magnitude in both total Hi mass and absolute B-band magnitude and is at the low-mass end of previously studied systems. We use Very Large Array Hi line data to estimate the energy required to create the centrally dominant hole in each galaxy. We compare this energy estimate to the past energy released by the underlying stellar populations computed from SFHs derived from data taken with the Hubble Space Telescope. The inferred integrated stellar energy released within the characteristic ages exceeds our energy estimates for creating the holes in all cases, assuming expected efficiencies. Therefore, it appears that stellar feedback provides sufficient energy to produce the observed holes. However, we find no obvious signature of single star-forming events responsible for the observed structures when comparing the global SFHs of each galaxy in our sample to each other or to those of dwarf irregular galaxies reported in the literature. We also fail to find evidence of a central star cluster in FUV or Hα imaging. We conclude that large Hi holes are likely formed from multiple generations of star formation and only under suitable interstellar medium conditions.

Item Type:Article
Related URLs:
URLURL TypeDescription
Weisz, Daniel R.0000-0002-6442-6030
Dolphin, Andrew E.0000-0001-8416-4093
Kennicutt, Robert C., Jr.0000-0001-5448-1821
Ott, Jürgen0000-0001-8224-1956
Van Dyk, Schuyler D.0000-0001-9038-9950
Walter, Fabian0000-0003-4793-7880
Additional Information:© 2011 The American Astronomical Society. Received 2011 March 4; accepted 2011 May 20; published 2011 August 9. The Very Large Array telescope of the National Radio Astronomy Observatory is operated by Associated Universities, Inc. under a cooperative agreement with the National Science Foundation. Based on observations made with the NASA/ESA Hubble Space Telescope which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. We thank the anonymous referee for a prompt and detailed report which significantly improved the clarity of the manuscript. Support for this work was provided by NRAO through the National Science Foundation collaborative research grant 807515. NRAO is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation. S.R.W. is grateful for support from a Penrose Fellowship. 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Radio Astronomy ObservatoryUNSPECIFIED
Penrose FellowshipUNSPECIFIED
NASANAS 5-26555
Subject Keywords:galaxies: dwarf; galaxies: individual (DDO 181, Holmberg I, M81 Dwarf A, Sextans A, UGC 8508); galaxies: ISM; ISM: structure
Issue or Number:1
Classification Code:PACS: 98.52.Wz;; 98.62.Ck; 98.58.Ge
Record Number:CaltechAUTHORS:20110906-092426043
Persistent URL:
Official Citation:The Formation of Kiloparsec-scale H I Holes in Dwarf Galaxies Steven R. Warren et al. 2011 ApJ 738 10
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25227
Deposited By: Ruth Sustaita
Deposited On:06 Sep 2011 16:57
Last Modified:09 Mar 2020 13:19

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