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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Dust and atomic gas in dwarf irregular galaxies of the M81 group: The SINGS and things view
Astrophysical Journal, Volume 661, No. 1 I, Year 2007
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Description
We present observations of the dust and atomic gas phase in seven dwarf irregular galaxies of the M81 group from the Spitzer SINGS and VLA THINGS surveys. The Spitzer observations provide a first glimpse of the nature of the nonatomic ISM in these metal-poor (Z ∼ 0.1 Z⊙), quiescent (SFR ∼ 0.001-0.1 M⊙ yr-1) dwarf galaxies. Most detected dust emission is restricted to H I column densities >1 × 1021 cm-2, and almost all regions of high H I column density (>2.5 × 1021 cm-2) have associated dust emission. Spitzer spectroscopy of two regions in the brightest galaxies (IC 2574 and Holmberg II) show distinctly different spectral shapes and aromatic features, although the galaxies have comparable gas-phase metallicities. This result emphasizes that the strength of the aromatic features is not a simple linear function of metallicity. We estimate dust masses of ∼10 4-106 M⊙ for the M81 dwarf galaxies, resulting in an average dust-to-gas ratio (Mdust/MH I) of ∼3 × 10-4 (1.5 × 10-3 if only the H I that is associated with dust emission is considered); this is an order of magnitude lower than the typical value derived for the SINGS spirals. The dwarf galaxies are underluminous per unit star formation rate at 70 p,m as compared to the more massive galaxies in SINGS by a factor of ∼2. However, the average 70/160 μm ratio in the sample dwarf galaxies is higher than what is found in the other galaxies of the SINGS sample. This can be explained by a combination of a lower dust content in conjunction with a higher dust temperature in the dwarfs. © 2007. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Walter, Fabian W.
Germany, Heidelberg
Max Planck Institute for Astronomy
Cannon, John M.
Germany, Heidelberg
Max Planck Institute for Astronomy
United States, Middletown
Wesleyan University Middletown
Roussel, Hélène
Germany, Heidelberg
Max Planck Institute for Astronomy
Bendo, George J.
United Kingdom, London
Imperial College London
Calzetti, Daniela
United States, Baltimore
Space Telescope Science Institute
Dale, Daniel A.
United States, Laramie
University of Wyoming
Draine, Bruce T.
United States, Princeton
Princeton University Observatory
Helou, George X.
United States, Pasadena
California Institute of Technology
Kennicutt, Robert C.
United Kingdom, Cambridge
University of Cambridge
United States, Tucson
The University of Arizona
Moustakas, John
United States, Tucson
The University of Arizona
United States, New York
New York University
Rieke, George H.
United States, Tucson
The University of Arizona
Armus, Lee
United States, Pasadena
California Institute of Technology
Gordon, Karl D.
United States, Tucson
The University of Arizona
Lee, Janice C.
United States, Tucson
The University of Arizona
Meyer, Martin J.
United States, Baltimore
Space Telescope Science Institute
Murphy, Eric Joseph
United States, New Haven
Yale University
Regan, Michael W.
United States, Baltimore
Space Telescope Science Institute
Smith, John David T.
United States, Tucson
The University of Arizona
Brinks, Elias
United Kingdom, Hatfield
University of Hertfordshire
de Blök, Willem J.G.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Bigiel, Frank
Germany, Heidelberg
Max Planck Institute for Astronomy
Thornley, Michele D.
United States, Lewisburg
Bucknell University
Statistics
Citations: 77
Authors: 22
Affiliations: 16
Identifiers
Doi:
10.1086/514807
ISSN:
0004637X
Research Areas
Environmental
Study Design
Cross Sectional Study