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A Spatially Resolved Study of the Cold Dust in NGC 205

Marleau, F. R. and Noriega-Crespo, A. and Misselt, K. and Gordon, K. and Rieke, G. H. and Barmby, P. and Willner, S. and Engelbracht, C. (2008) A Spatially Resolved Study of the Cold Dust in NGC 205. In: The second annual Spitzer Science Center conference : infrared diagnostics of galaxy evolution. ASP Conference Series. Vol.381. Astronomical Society of the Pacific , San Francisco, pp. 177-180. ISBN 978-1-58381-325-6.

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We present IRAC and MIPS observations of NGC 205, the dwarf elliptical companion of M31, obtained with the Spitzer Space Telescope. The extended dust emission is spatially concentrated in three main emission regions. Based on our mid-to-far infrared flux density measurements alone, we derive a total dust mass estimate of the order of 3.2 × 10^4 M_⊙, at a temperature of ~20K. 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 1.1mm observations over a small central region or “Core” (18" diameter), suggest the presence of very cold (T ~ 12K) dust and a dust mass 16 times higher than is estimated from the Spitzer measurements alone. Assuming a gas to dust mass ratio of 100, these two datasets, i.e. with and without the millimeter observations, suggest a total gas mass range of 3.2 × 10^6 to 5 × 10^7 M_⊙.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Noriega-Crespo, A.0000-0002-6296-8960
Rieke, G. H.0000-0003-2303-6519
Barmby, P.0000-0003-2767-0090
Willner, S.0000-0002-9895-5758
Additional Information:© 2008 Astronomical Society of the Pacific. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory (JPL), California Institute of Technology under NASA contract 1407. Support for this work was provided by NASA and through JPL Contract 1255094.
Group:Infrared Processing and Analysis Center (IPAC)
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Series Name:ASP Conference Series
Record Number:CaltechAUTHORS:20100722-080112130
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19152
Deposited By: Tony Diaz
Deposited On:02 Aug 2010 19:38
Last Modified:10 Dec 2019 22:35

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