Far infrared mapping of three galactic star forming regions

Abstract

Three Galactic star forming regions in the northern sky, viz., associated with W3(OH), S209 and S187 have been simultaneously mapped in two trans-IRAS far infrared (FIR) bands centered at ~ 140 and 200 μm using the TIFR 100 cm balloon borne FIR telescope. These maps show extended FIR emission with structures. The spatial distribution of cold dust (T < 30 K) for two of these sources (W3(OH) & S209), has been generated from these maps. The HIRES processed IRAS maps of these regions at 12, 25, 60 & 100 μm have also been used for comparison. Point-like sources have been extracted from the longest waveband TIFR maps and searched for associations in the other five bands. Their positions, flux densities etc have been determined.