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SUBMILLIMETER OBSERVATIONS OF DENSE CLUMPS IN THE INFRARED DARK CLOUD G049.40-00.01
Kang, Miju,Choi, Minho,Bieging, John H.,Rho, Jeonghee,Lee, Jeong-Eun,Tsai, Chao-Wei IOP Publishing 2011 The Astrophysical journal Vol.743 No.2
<P>We obtained 350 and 850 mu m continuum maps of the infrared dark cloud G049.40-00.01. Twenty-one dense clumps were identified within G049.40-00.01 based on the 350 mu m continuum map with an angular resolution of about 9 ''.6. We present submillimeter continuum maps and report physical properties of the clumps. The masses of clumps range from 50 to 600 M-circle dot. About 70% of the clumps are associated with bright 24 mu m emission sources, and they may contain protostars. The two most massive clumps show extended, enhanced 4.5 mu m emission indicating vigorous star-forming activity. The clump-size-mass distribution suggests that many of them are forming high-mass stars. G049.40-00.01 contains numerous objects in various evolutionary stages of star formation, from pre-protostellar clumps to H II regions.</P>