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We present far-infrared observations of Monoceros R2 (a giant molecular cloudat approximately 830 pc distance, containing several sites of active starformation), as observed at 70 {\mu}m, 160 {\mu}m, 250 {\mu}m, 350 {\mu}m, and500 {\mu}m by the Photodetector Array Camera and Spectrometer (PACS) andSpectral and Photometric Imaging Receiver (SPIRE) instruments on the HerschelSpace Observatory as part of the Herschel imaging survey of OB young stellarobjects (HOBYS) Key programme. The Herschel data are complemented by SCUBA-2data in the submillimetre range, and WISE and Spitzer data in the mid-infrared.In addition, C18O data from the IRAM 30-m Telescope are presented, and used forkinematic information. Sources were extracted from the maps with getsources,and from the fluxes measured, spectral energy distributions were constructed,allowing measurements of source mass and dust temperature. Of 177 Herschelsources robustly detected in the region (a detection with high signal-to-noiseand low axis ratio at multiple wavelengths), including protostars and starlesscores, 29 are found in a filamentary hub at the centre of the region (a littleover 1% of the observed area). These objects are on average smaller, moremassive, and more luminous than those in the surrounding regions (whichtogether suggest that they are at a later stage of evolution), a result thatcannot be explained entirely by selection effects. These results suggest apicture in which the hub may have begun star formation at a point significantlyearlier than the outer regions, possibly forming as a result of feedback fromearlier star formation. Furthermore, the hub may be sustaining its starformation by accreting material from the surrounding filaments.

Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub