Distribution of Cold Dust in Orion A and B | Zendy

B. Mookerjea | Zendy; S. K. Ghosh | Zendy; T. N. Rengarajan | Zendy; S. N. Tandon | Zendy; R. P. Verma | Zendy

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Distribution of Cold Dust in Orion A and B

Author(s) -

B. Mookerjea,

S. K. Ghosh,

T. N. Rengarajan,

S. N. Tandon,

R. P. Verma

Publication year - 2000

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/301554

Subject(s) - physics , orion nebula , astrophysics , stars

Large scale far-infrared (FIR) observations of the Orion complex at 205 and138 micron are presented with an aim of studying the distribution of cold (< 25K) dust. The maps in these FIR bands extend over approximately 3600 sq. arcminand cover regions around OMC-1, 2, 3 in Orion A and NGC 2023 and NGC 2024 inOrion B. Some limited regions have also been mapped at 57 micron. A total of 15sources in Orion A and 14 in Orion B (south) have been identified from our FIRmaps. Dust temperature distribution in both Orion A and Orion B (south) havebeen determined reliably using the maps at 205 & 138 micron obtained fromsimultaneous observations using almost identical beams (1.6 dia). Thesetemperatures have been used to generate map of the optical depth at 150 micron,for the Orion B region. The coldest source detected is in OMC-3 and has atemperature of about 15 K. The diffuse FIR emission in the differentsub-regions is found to vary between 25% to 50% of the total FIR emission fromthat sub-region.Comment: Accepted for Publication in the Astronomical Journa

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