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We present the first overview of the Herschel observations of the nearbyhigh-mass star-forming region NGC 7538, taken as part of the Herschel imagingstudy of OB Young Stellar objects (HOBYS) Key Programme. These PACS and SPIREmaps cover an approximate area of one square degree at five submillimeter andfar-infrared wavebands. We have identified 780 dense sources and classified 224of those. With the intention of investigating the existence of cold massivestarless or class 0-like clumps that would have the potential to formintermediate- to high-mass stars, we further isolate 13 clumps as the mostlikely candidates for followup studies. These 13 clumps have masses in excessof 40 M_sun and temperatures below 15 K. They range in size from 0.4 pc to 2.5pc and have densities between 3x10^3 cm^-3 to 4x10^4 cm^-3. Spectral energydistributions are then used to characterize their energetics and evolutionarystate through a luminosity-mass diagram. NGC 7538 has a highly filamentarystructure, previously unseen in the dust continuum of existing submillimetersurveys. We report the most complete imaging to date of a large, evacuated ringof material in NGC 7538 which is bordered by many cool sources.

Herschel Reveals Massive Cold Clumps in NGC 7538