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We present the Forgotten Quadrant Survey (FQS), an ESO large project thatused the 12m antenna of the Arizona Radio Observatory to map the Galactic Planein the range 220\deg$<l<$240\deg and -2.5\deg$<b<$0\deg, both in $^{12}$CO(1-0)and $^{13}$CO(1-0), at a spectral resolution of 0.65 km s$^{-1}$ and 0.26 kms$^{-1}$. Our dataset allows us to easily identify how the molecular dense gasis organised at different spatial scales: from the giant clouds with theirdenser filamentary networks, down to the clumps and cores that host the newbornstars and to obtain reliable estimates of their key physical parameters. Wepresent the first release of the FQS data and discuss their quality. Spectrawith 0.65 km s$^{-1}$ velocity channels have a noise ranging from 0.8 K to 1.3K for $^{12}$CO(1-0) and from 0.3 K to 0.6 K for $^{13}$CO(1-0). In this paper,we used the $^{12}$CO(1-0) spectral cubes to produce a catalogue of 263molecular clouds. This is the first selfconsistent, statistical catalogue ofmolecular clouds of the outer Galaxy, obtained with a subarcminute spatialresolution and therefore able to detect not only the classical giant molecularclouds, but also the small clouds and to resolve the cloud structure at thesubparsec scale up to a distance of a few kpc. We found two classes of objects:structures with size above a few parsecs that are typical molecular clouds andmay be self-gravitating, and subparsec structures that cannot be ingravitational equilibrium and are likely transient or confined by externalpressure. We used the ratio between the Herschel H$_2$ column density and theintegrated intensity of the CO lines to calculate the CO conversion factor andwe found mean values of (3.3$\pm$1.4)$\times 10^{20}$ cm$^{-2}$(K kms$^{-1})^{-1}$ and (1.2$\pm$0.4)$\times 10^{21}$ cm$^{-2}$(K km s$^{-1})^{-1}$,for $^{12}$CO(1-0) and $^{13}$CO(1-0), respectively.

astronomy and astrophysics

The Forgotten Quadrant Survey. $^{12}$CO and $^{13}$CO (1-0) survey of  the Galactic Plane in the range 220{\deg}$<l<$240{\deg}  -2.5{\deg}$<b<$0{\deg}