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Ao","submitted_at":"2019-06-16T03:16:42Z","abstract_excerpt":"We derive molecular-gas-phase $^{12}$C/$^{13}$C isotope ratios for the central few 100 pc of the three nearby starburst galaxies NGC 253, NGC 1068, and NGC 4945 making use of the $\\lambda$ $\\sim$ 3 mm $^{12}$CN and $^{13}$CN $N$ = 1--0 lines in the ALMA Band 3. The $^{12}$C/$^{13}$C isotopic ratios derived from the ratios of these lines range from 30 to 67 with an average of 41.6 $\\pm$ 0.2 in NGC 253, from 24 to 62 with an average of 38.3 $\\pm$ 0.4 in NGC 1068, and from 6 to 44 with an average of 16.9 $\\pm$ 0.3 in NGC 4945. 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Henkel, H. M. Asiri, J. Esimbek, J. J. Zhou, J. S. Zhang, K. M. Menten, M. Spaans, R. Aladro, S. Aalto, S. Garcia-Burillo, S. Levshakov, S. Martin, S. Muhle, S. Muller, S. Viti, X. D. Tang, X. W. Zheng, Y. Gong, Y. P. Ao","submitted_at":"2019-06-16T03:16:42Z","abstract_excerpt":"We derive molecular-gas-phase $^{12}$C/$^{13}$C isotope ratios for the central few 100 pc of the three nearby starburst galaxies NGC 253, NGC 1068, and NGC 4945 making use of the $\\lambda$ $\\sim$ 3 mm $^{12}$CN and $^{13}$CN $N$ = 1--0 lines in the ALMA Band 3. The $^{12}$C/$^{13}$C isotopic ratios derived from the ratios of these lines range from 30 to 67 with an average of 41.6 $\\pm$ 0.2 in NGC 253, from 24 to 62 with an average of 38.3 $\\pm$ 0.4 in NGC 1068, and from 6 to 44 with an average of 16.9 $\\pm$ 0.3 in NGC 4945. 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