Myers et al. 1980

Myers, P.C., P. Thaddeus, and R.A. Linke, 1980: A search for interstellar pyrrole: Evidence that rings are less abundant than chains. Astrophys. J., 241, 155-157, doi:10.1086/158326.

Searches for three transitions of pyrrole (C₄H₅N) give maximum column density = 3-10×10¹³ cm^-2 in Sgr B2. This limit is more than 10 times lower than previous ring molecule limits, and is slightly lower than column densities of known interstellar molecules with from four to six heavy atoms.

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Myers, P.C., Thaddeus, P., and Linke, R.A.: A search for interstellar pyrrole: Evidence that rings are less abundant than chains, Astrophys. J., 241, 155-157, doi:10.1086/158326, 1980.

Myers, P.C., P. Thaddeus, and R.A. Linke (1980), A search for interstellar pyrrole: Evidence that rings are less abundant than chains, Astrophys. J., 241, 155-157, doi:10.1086/158326.

Myers, P.C., P. Thaddeus, and R.A. Linke, 1980: A search for interstellar pyrrole: Evidence that rings are less abundant than chains. Astrophys. J., 241, 155-157, doi:10.1086/158326.

Myers, P.C., Thaddeus, P., & Linke, R.A. 1980, Astrophys. J., 241, 155, doi:10.1086/158326.

Myers PC, Thaddeus P, Linke RA. A search for interstellar pyrrole: Evidence that rings are less abundant than chains, Astrophys J 1980;241:155-157. doi:10.1086/158326.

P.C. Myers, P. Thaddeus, R.A. Linke, Astrophys. J. 241, 155-157, doi:10.1086/158326 (1980).