Infrared images of the dark cloud core B59 were obtained with the Spitzer Space Telescope as part of the “ Cores to Disks ” Legacy Science project .
Photometry from 3.6-70 \mu m indicates at least 20 candidate low-mass young stars near the core , more than doubling the previously known population .
Out of this group , 13 are located within \sim 0.1 pc in projection of the molecular gas peak , where a new embedded source is detected .
Spectral energy distributions span the range from small excesses above photospheric levels to rising in the mid-infrared .
One other embedded object , probably associated with the millimeter source B59-MMS1 , with a bolometric luminosity L _ { bol } \sim 2 L _ { \odot } , has extended structure at 3.6 and 4.5 \mu m , possibly tracing the edges of an outflow cavity .
The measured extinction through the central part of the core is A _ { V } \gtrsim 45 mag .
The B59 core is producing young stars with a high efficiency .