Abstract
Large scale (~0.6 sq deg) mapping of the giant Galactic star forming complex W 51 has been carried out simultaneously in two trans-IRAS far infrared (FIR) bands centered at ~200 and 130 μ m using the TIFR 100 cm balloon borne FIR telescope. The choice of the bands is motivated by the aim of studying the emission from the cold dust ( T 30 K) component. These maps with ~1' spatial resolution, show extended emission with structures. Nearly identical beams in the two bands have enabled us to reliably determine the distribution of dust temperature T (130/200), and optical depth τ 200 , in the central region of the W 51 complex. A total of 25 discrete sources have been extracted from the 200 μ m map, of which 8 have been associated with IRAS PSC sources and 16 with sources in HIRES processed IRAS maps at 100, 60, 25 & 12 μ m bands. The values of the emissivity power law index β in FIR, show wide variation among these sources.
Published Version
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