Dense gas in nearby galaxies XI. Interstellar 12C/13C ratios in the central regions of M82 and IC342

C. Henkel, Y. -N. Chin, R. Mauersberger +1

${}^{12}$C${/}^{13}$C line intensity ratios have been derived from several carbon-bearing molecules to confine the range of carbon and oxygen isotope abundance ratios toward the nuclea…