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AIMS: To study the structure of nearby (< 500 pc) dense starless andstar-forming cores with the particular goal to identify and understandevolutionary trends in core properties, and to explore the nature of Very LowLuminosity Objects (< 0.1 L_sun; VeLLOs). METHODS: Using the MAMBO bolometerarray, we create maps unusually sensitive to faint (few mJy per beam) extended(approx. 5 arcmin) thermal dust continuum emission at 1.2 mm wavelength.Complementary information on embedded stars is obtained from Spitzer, IRAS, and2MASS. RESULTS: Our maps are very rich in structure, and we characterizeextended emission features (``subcores'') and compact intensity peaks in ourdata separately to pay attention to this complexity. We derive, e.g., sizes,masses, and aspect ratios for the subcores, as well as column densities andrelated properties for the peaks. Combination with archival infrared data thenenables the derivation of bolometric luminosities and temperatures, as well asenvelope masses, for the young embedded stars. CONCLUSIONS: (abridged) Starlessand star-forming cores occupy the same parameter space in many core properties;a picture of dense core evolution in which any dense core begins to activelyform stars once it exceeds some fixed limit in, e.g., mass, density, or both,is inconsistent with our data. Comparison of various evolutionary indicatorsfor young stellar objects in our sample (e.g., bolometric temperatures) revealsinconsistencies between some of them, possibly suggesting a revision of some ofthese indicators.

MAMBO Mapping of Spitzer c2d Small Clouds and Cores