Tucker et al. 1973
Tucker, K.D., M.L. Kutner, and P. Thaddeus, 1973: A large carbon monoxide cloud in Orion. Astrophys. J., 186, L13-L17.
Carbon monoxide line emission a λ = 2.6 mm has been observed over an area of ~ 1½°×4° in L1630, a diffuse dark nebula bridging 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 mainly molecular hyrogen. The H2 mass is estimated from the carbon monoxide observations to be 2.5×104 ~< M ~< 1×105 M☉, a significant fraction of the total mass of stars and gas within the boundaries of the I Ori association.
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Tucker, K.D., Kutner, M.L., and Thaddeus, P.: A large carbon monoxide cloud in Orion, Astrophys. J., 186, L13-L17, 1973.
Tucker, K.D., M.L. Kutner, and P. Thaddeus (1973), A large carbon monoxide cloud in Orion, Astrophys. J., 186, L13-L17.
Tucker, K.D., M.L. Kutner, and P. Thaddeus, 1973: A large carbon monoxide cloud in Orion. Astrophys. J., 186, L13-L17.
Tucker, K.D., Kutner, M.L., & Thaddeus, P. 1973, Astrophys. J., 186, L13.
Tucker KD, Kutner ML, Thaddeus P. A large carbon monoxide cloud in Orion, Astrophys J 1973;186:L13-L17.
K.D. Tucker, M.L. Kutner, P. Thaddeus, Astrophys. J. 186, L13-L17 (1973).
