Very cold dust in the peculiar dwarf elliptical galaxy NGC 205

Abstract

ISO observations of NGC 205 between 120 and 200 mu m resolve the emission from 20-24 K cold dust. It is extended to about 7farcm 5x7farcm 5 with bright concentrations in a 1farcm 5 north-south elongated area, similar to the that seen in HI. Supplemented by IRAS and mm literature data, the photometry of the total galaxy and the central region is disentangled. It indicates the presence of very cold dust below 10 K which would be the first such detection in an elliptical galaxy. Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.