NASA NTRS · 19740030837
A large carbon monoxide cloud in Orion
Abstract
Carbon monoxide line emission was observed at a wavelength of 2.6 mm in an area of L1630, a diffuse dark nebula forming a bridge between NGC 2024 and the reflection nebula NGC 2068. The absence of a 21-cm counterpart to this region of high visual extinction suggests that L1630 is predominantly molecular hydrogen. The molecular hydrogen mass, estimated from the carbon monoxide observations, is found to comprise a significant fraction of the total mass of stars and gas within the boundaries of I Ori association.
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Tucker, K. D., Kutner, M. L., Thaddeus, P.. 1973-11-15. A large carbon monoxide cloud in Orion. https://ntrs.nasa.gov/citations/19740030837
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