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Rotational transition lines of CO are one of the major tracers used to studystar forming regions and Galactic structures. A large number of observations ofCO rotational lines are covering the galactic plane, recently the $Planck$collaboration release the first full sky coverage of J=1-0, J=2-1, and J=3-2 COlines at a resolution of 10', 5', and 5' FWHM. However, the measured signal in$Planck$ detectors is integrated over large bandpass $(\Delta \nu)/\nu \simeq0.2$. Consequently, the derived CO products are composite maps includingseveral rotational lines. In the 100 GHz $Planck$ channel, the two main linesare the J=1-0 transitions of $^{12}$CO and $^{13}$CO at 115 and 110 GHzrespectively. In the present paper, we present and applied a method toconstruct separate CO integrated intensity maps for the two isotopes. Themeasurement of the $^{13}$CO rotational transitions provide an unprecedentedall-sky view of the Galaxy for this isotope.

Extraction of $^{12}$CO and $^{13}$CO maps from $Planck$ data