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We present the first Herschel PACS and SPIRE photometric observations in aportion of the outer Galaxy ($216.5^{\circ} \lesssim \ell \lesssim225.5^{\circ}$ and $-2^{\circ} \lesssim b \lesssim 0^{\circ}$) as a part of theHi-GAL survey. The maps between 70 and 500 $\mu$m, the derived column densityand temperature maps, and the compact source catalog are presented. NANTENCO(1-0) line observations are used to derive cloud kinematics and distances, sothat we can estimate distance-dependent physical parameters of the compactsources (cores and clumps) having a reliable spectral energy distribution, thatwe separate in 255 proto-stellar and 688 starless. Both typologies are found inassociation with all the distance components observed in the field, up to $\sim5.8$ kpc, testifying the presence of star formation beyond the Perseus arm atthese longitudes. Selecting the starless gravitationally bound sources weidentify 590 pre-stellar candidates. Several sources of both proto- andpre-stellar nature are found to exceed the minimum requirement for beingcompatible with massive star formation, based on the mass-radius relation. Forthe pre-stellar sources belonging to the Local arm ($d\lesssim1.5$ kpc) westudy the mass function, whose high-mass end shows a power-law $N(\log M)\propto M^{-1.0 \pm 0.2}$. Finally, we use a luminosity vs mass diagram toinfer the evolutionary status of the sources, finding that most of theproto-stellar are in the early accretion phase (with some cases compatible witha Class I stage), while for pre-stellar sources, in general, accretion has notstarted yet.

The first Hi-GAL observations of the outer Galaxy: a look to star formation in the third Galactic quadrant in the longitude range 216.5 < l < 225.5