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Far infrared study of the giant star forming complex W 51

Published online by Cambridge University Press:  25 September 2002

M. Giard ,
J.P. Bernard ,
A. Klotz ,
I. Ristorcelli ,
S. K. Ghosh ,
D. K. Ojha  and
R. P. Verma
S. K. Ghosh
Affiliation:
Tata Institute of Fundamental Research, Mumbai (Bombay) 400 005, India
D. K. Ojha
Affiliation:
Tata Institute of Fundamental Research, Mumbai (Bombay) 400 005, India
R. P. Verma
Affiliation:
Tata Institute of Fundamental Research, Mumbai (Bombay) 400 005, India
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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 μm 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 opticaldepth τ200, in the central region of the W 51 complex. A total of 25 discrete sources have been extracted from the 200 μmmap, of which 8 have been associated with IRAS PSC sources and 16 with sources in HIRES processed IRAS maps at 100, 60, 25 & 12 μmbands.The values of the emissivity power law index β in FIR, show wide variation among these sources.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 4: Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra , 2002 , pp. 333
Copyright
© EAS, EDP Sciences, 2002

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