Dust and atomic gas in dwarf irregular galaxies of the M81 group: The SINGS and things view

Fabian Walter, John M. Cannon, Hélène Roussel, George J. Bendo, Daniela Calzetti, Daniel A. Dale, Bruce T. Draine, George Helou, Robert C. Kennicutt, John Moustakas, George H. Rieke, L. Armus, Charles W. Engelbracht, Karl Gordon, David J. Hollenbach, Janice Lee, Aigen Li, Martin J. Meyer, Eric J. Murphy, Michael W. ReganJohn David T Smith, Elias Brinks, W. J G De Blok, Frank Bigiel, Michele D. Thornley

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)102-114
Number of pages13
JournalAstrophysical Journal
Volume661
Issue number1 I
DOIs
StatePublished - May 20 2007

Fingerprint

irregular galaxies
monatomic gases
dwarf galaxies
dust
gases
gas
galaxies
metallicity
vapor phases
star formation rate
spectroscopy
metal
estimates

Keywords

  • Galaxies: dwarf
  • Galaxies: individual (DDO 53, DDO 165, Holmberg I, Holmberg II, IC 2574, M81 dwA, M81 dwB)
  • Galaxies: irregular
  • Galaxies: ISM
  • Infrared: galaxies

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Walter, F., Cannon, J. M., Roussel, H., Bendo, G. J., Calzetti, D., Dale, D. A., ... Thornley, M. D. (2007). Dust and atomic gas in dwarf irregular galaxies of the M81 group: The SINGS and things view. Astrophysical Journal, 661(1 I), 102-114. https://doi.org/10.1086/514807

Dust and atomic gas in dwarf irregular galaxies of the M81 group : The SINGS and things view. / Walter, Fabian; Cannon, John M.; Roussel, Hélène; Bendo, George J.; Calzetti, Daniela; Dale, Daniel A.; Draine, Bruce T.; Helou, George; Kennicutt, Robert C.; Moustakas, John; Rieke, George H.; Armus, L.; Engelbracht, Charles W.; Gordon, Karl; Hollenbach, David J.; Lee, Janice; Li, Aigen; Meyer, Martin J.; Murphy, Eric J.; Regan, Michael W.; Smith, John David T; Brinks, Elias; De Blok, W. J G; Bigiel, Frank; Thornley, Michele D.

In: Astrophysical Journal, Vol. 661, No. 1 I, 20.05.2007, p. 102-114.

Research output: Contribution to journalArticle

Walter, F, Cannon, JM, Roussel, H, Bendo, GJ, Calzetti, D, Dale, DA, Draine, BT, Helou, G, Kennicutt, RC, Moustakas, J, Rieke, GH, Armus, L, Engelbracht, CW, Gordon, K, Hollenbach, DJ, Lee, J, Li, A, Meyer, MJ, Murphy, EJ, Regan, MW, Smith, JDT, Brinks, E, De Blok, WJG, Bigiel, F & Thornley, MD 2007, 'Dust and atomic gas in dwarf irregular galaxies of the M81 group: The SINGS and things view', Astrophysical Journal, vol. 661, no. 1 I, pp. 102-114. https://doi.org/10.1086/514807
Walter F, Cannon JM, Roussel H, Bendo GJ, Calzetti D, Dale DA et al. Dust and atomic gas in dwarf irregular galaxies of the M81 group: The SINGS and things view. Astrophysical Journal. 2007 May 20;661(1 I):102-114. https://doi.org/10.1086/514807
Walter, Fabian ; Cannon, John M. ; Roussel, Hélène ; Bendo, George J. ; Calzetti, Daniela ; Dale, Daniel A. ; Draine, Bruce T. ; Helou, George ; Kennicutt, Robert C. ; Moustakas, John ; Rieke, George H. ; Armus, L. ; Engelbracht, Charles W. ; Gordon, Karl ; Hollenbach, David J. ; Lee, Janice ; Li, Aigen ; Meyer, Martin J. ; Murphy, Eric J. ; Regan, Michael W. ; Smith, John David T ; Brinks, Elias ; De Blok, W. J G ; Bigiel, Frank ; Thornley, Michele D. / Dust and atomic gas in dwarf irregular galaxies of the M81 group : The SINGS and things view. In: Astrophysical Journal. 2007 ; Vol. 661, No. 1 I. pp. 102-114.
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T2 - The SINGS and things view

AU - Walter, Fabian

AU - Cannon, John M.

AU - Roussel, Hélène

AU - Bendo, George J.

AU - Calzetti, Daniela

AU - Dale, Daniel A.

AU - Draine, Bruce T.

AU - Helou, George

AU - Kennicutt, Robert C.

AU - Moustakas, John

AU - Rieke, George H.

AU - Armus, L.

AU - Engelbracht, Charles W.

AU - Gordon, Karl

AU - Hollenbach, David J.

AU - Lee, Janice

AU - Li, Aigen

AU - Meyer, Martin J.

AU - Murphy, Eric J.

AU - Regan, Michael W.

AU - Smith, John David T

AU - Brinks, Elias

AU - De Blok, W. J G

AU - Bigiel, Frank

AU - Thornley, Michele D.

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N2 - 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.

AB - 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.

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KW - Galaxies: individual (DDO 53, DDO 165, Holmberg I, Holmberg II, IC 2574, M81 dwA, M81 dwB)

KW - Galaxies: irregular

KW - Galaxies: ISM

KW - Infrared: galaxies

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