The Perseus star forming region at 1 kpc distance: what we can learn for the distant high-mass star forming clouds.
Typical distances of high-mass star forming regions (SFRs) are of the order of 1 kpc or more, so the mass distribution derived from the fluxes is artificially cut at the lower end for the limit in sensitivity, while the lack of adequate spatial resolution causes clumping of close sources. These effects must be considered when discussing the properties of a high-mass SFR: the cut in sensitivity turns into a cut in the mass, but the effects of the source confusion are not easy to model. Herschel data provide for the first time images in the 70-500 μm at high spatial resolution (~5" to 36"). We have now the possibility to image the closest low mass SFRs with a high level of detail. As part of the Herschel Gould Belt survey, the SFR in Perseus, forming stars of low- to intermediate mass has been observed by both the PACS and SPIRE Herschel instruments. Here we report the results of a photometric analysis of this SFR both at its native distance of 250 pc and at a scaled 1 kpc distance: we discuss how the lower linear resolution of the more distant cloud affects our understanding of its star-forming properties.