Mapping and mass measurement of the cold dust in NGC 205 with Spitzer

F. R. Marleau, A. Noriega-Crespo, K. A. Misselt, K. D. Gordon, C. W. Engelbracht, George H. Rieke, P. Barmby, S. P. Willner, J. Mould, R. D. Gehrz, C. E. Woodward

Research output: Contribution to journalArticle

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Abstract

We present observations at 3.6, 4.5, 5.8, 8, 24, 70, and 160 μm of NGC 205, the dwarf elliptical companion of M31, obtained with the Spitzer Space Telescope. The point-source-subtracted images at 8 and 24 μm display a complex and fragmented infrared emission coming from both very small dust particles and larger grains. The extended dust emission is spatially concentrated in three main emission regions, seen at all wavelengths from 8 to 160 μm. These regions lie approximately along NGC 205's semimajor axis and range from ∼100 to 300 pc in size. On the basis of our mid-/far-infrared flux density measurements alone, we derive a total dust mass estimate on the order of 3.2 × 104 M, mainly at a temperature of ∼20 K. The gas mass associated with this component matches the predicted mass returned by the dying stars from the last burst of star formation in NGC 205 (∼0.5 Gyr ago). Analysis of the Spitzer data combined with previous 1.1 mm observations over a small central or "Core" region (18″ diameter) suggests the presence of very cold (T ∼ 12 K) dust and a dust mass about 16 times higher than is estimated from the Spitzer measurements alone. Assuming a gas-to-dust mass ratio of 100, these two data sets, i.e., with and without the millimeter observations, suggest a total gas mass in the range from 3.2 × 106 to 5 × 107 M.

Original languageEnglish (US)
Pages (from-to)929-938
Number of pages10
JournalAstrophysical Journal
Volume646
Issue number2 I
DOIs
StatePublished - Aug 1 2006

Fingerprint

dust
gases
gas
Space Infrared Telescope Facility
mass ratios
point sources
point source
cold
star formation
bursts
flux density
wavelength
stars
estimates
wavelengths
temperature

Keywords

  • Dust, extinction
  • Galaxies: dwarf
  • Galaxies: individual (NGC 205)
  • Galaxies: ISM
  • Infrared: galaxies
  • Infrared: ISM
  • ISM: structure

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Marleau, F. R., Noriega-Crespo, A., Misselt, K. A., Gordon, K. D., Engelbracht, C. W., Rieke, G. H., ... Woodward, C. E. (2006). Mapping and mass measurement of the cold dust in NGC 205 with Spitzer. Astrophysical Journal, 646(2 I), 929-938. https://doi.org/10.1086/504975

Mapping and mass measurement of the cold dust in NGC 205 with Spitzer. / Marleau, F. R.; Noriega-Crespo, A.; Misselt, K. A.; Gordon, K. D.; Engelbracht, C. W.; Rieke, George H.; Barmby, P.; Willner, S. P.; Mould, J.; Gehrz, R. D.; Woodward, C. E.

In: Astrophysical Journal, Vol. 646, No. 2 I, 01.08.2006, p. 929-938.

Research output: Contribution to journalArticle

Marleau, FR, Noriega-Crespo, A, Misselt, KA, Gordon, KD, Engelbracht, CW, Rieke, GH, Barmby, P, Willner, SP, Mould, J, Gehrz, RD & Woodward, CE 2006, 'Mapping and mass measurement of the cold dust in NGC 205 with Spitzer', Astrophysical Journal, vol. 646, no. 2 I, pp. 929-938. https://doi.org/10.1086/504975
Marleau FR, Noriega-Crespo A, Misselt KA, Gordon KD, Engelbracht CW, Rieke GH et al. Mapping and mass measurement of the cold dust in NGC 205 with Spitzer. Astrophysical Journal. 2006 Aug 1;646(2 I):929-938. https://doi.org/10.1086/504975
Marleau, F. R. ; Noriega-Crespo, A. ; Misselt, K. A. ; Gordon, K. D. ; Engelbracht, C. W. ; Rieke, George H. ; Barmby, P. ; Willner, S. P. ; Mould, J. ; Gehrz, R. D. ; Woodward, C. E. / Mapping and mass measurement of the cold dust in NGC 205 with Spitzer. In: Astrophysical Journal. 2006 ; Vol. 646, No. 2 I. pp. 929-938.
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abstract = "We present observations at 3.6, 4.5, 5.8, 8, 24, 70, and 160 μm of NGC 205, the dwarf elliptical companion of M31, obtained with the Spitzer Space Telescope. The point-source-subtracted images at 8 and 24 μm display a complex and fragmented infrared emission coming from both very small dust particles and larger grains. The extended dust emission is spatially concentrated in three main emission regions, seen at all wavelengths from 8 to 160 μm. These regions lie approximately along NGC 205's semimajor axis and range from ∼100 to 300 pc in size. On the basis of our mid-/far-infrared flux density measurements alone, we derive a total dust mass estimate on the order of 3.2 × 104 M⊙, mainly at a temperature of ∼20 K. The gas mass associated with this component matches the predicted mass returned by the dying stars from the last burst of star formation in NGC 205 (∼0.5 Gyr ago). Analysis of the Spitzer data combined with previous 1.1 mm observations over a small central or {"}Core{"} region (18″ diameter) suggests the presence of very cold (T ∼ 12 K) dust and a dust mass about 16 times higher than is estimated from the Spitzer measurements alone. Assuming a gas-to-dust mass ratio of 100, these two data sets, i.e., with and without the millimeter observations, suggest a total gas mass in the range from 3.2 × 106 to 5 × 107 M⊙.",
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AU - Marleau, F. R.

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AU - Misselt, K. A.

AU - Gordon, K. D.

AU - Engelbracht, C. W.

AU - Rieke, George H.

AU - Barmby, P.

AU - Willner, S. P.

AU - Mould, J.

AU - Gehrz, R. D.

AU - Woodward, C. E.

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N2 - We present observations at 3.6, 4.5, 5.8, 8, 24, 70, and 160 μm of NGC 205, the dwarf elliptical companion of M31, obtained with the Spitzer Space Telescope. The point-source-subtracted images at 8 and 24 μm display a complex and fragmented infrared emission coming from both very small dust particles and larger grains. The extended dust emission is spatially concentrated in three main emission regions, seen at all wavelengths from 8 to 160 μm. These regions lie approximately along NGC 205's semimajor axis and range from ∼100 to 300 pc in size. On the basis of our mid-/far-infrared flux density measurements alone, we derive a total dust mass estimate on the order of 3.2 × 104 M⊙, mainly at a temperature of ∼20 K. The gas mass associated with this component matches the predicted mass returned by the dying stars from the last burst of star formation in NGC 205 (∼0.5 Gyr ago). Analysis of the Spitzer data combined with previous 1.1 mm observations over a small central or "Core" region (18″ diameter) suggests the presence of very cold (T ∼ 12 K) dust and a dust mass about 16 times higher than is estimated from the Spitzer measurements alone. Assuming a gas-to-dust mass ratio of 100, these two data sets, i.e., with and without the millimeter observations, suggest a total gas mass in the range from 3.2 × 106 to 5 × 107 M⊙.

AB - We present observations at 3.6, 4.5, 5.8, 8, 24, 70, and 160 μm of NGC 205, the dwarf elliptical companion of M31, obtained with the Spitzer Space Telescope. The point-source-subtracted images at 8 and 24 μm display a complex and fragmented infrared emission coming from both very small dust particles and larger grains. The extended dust emission is spatially concentrated in three main emission regions, seen at all wavelengths from 8 to 160 μm. These regions lie approximately along NGC 205's semimajor axis and range from ∼100 to 300 pc in size. On the basis of our mid-/far-infrared flux density measurements alone, we derive a total dust mass estimate on the order of 3.2 × 104 M⊙, mainly at a temperature of ∼20 K. The gas mass associated with this component matches the predicted mass returned by the dying stars from the last burst of star formation in NGC 205 (∼0.5 Gyr ago). Analysis of the Spitzer data combined with previous 1.1 mm observations over a small central or "Core" region (18″ diameter) suggests the presence of very cold (T ∼ 12 K) dust and a dust mass about 16 times higher than is estimated from the Spitzer measurements alone. Assuming a gas-to-dust mass ratio of 100, these two data sets, i.e., with and without the millimeter observations, suggest a total gas mass in the range from 3.2 × 106 to 5 × 107 M⊙.

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KW - Galaxies: dwarf

KW - Galaxies: individual (NGC 205)

KW - Galaxies: ISM

KW - Infrared: galaxies

KW - Infrared: ISM

KW - ISM: structure

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