Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..177m&link_type=abstract
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,
Astronomy and Astrophysics
Astronomy
Scientific paper
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_&sun;, 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 arcsec~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_&sun;.
Barmby Pauline
Engelbracht Charles
Gordon Karl
Marleau Francine R.
Misselt Karl
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