The low-mass star formation region associated with the reflection nebula Cederblad 110 in the Chamaeleon I cloud was mapped with the Australian Telescope Compact Array ( ATCA ) at 6 and 3.5 cm .
Altogether 11 sources were detected , three of which are previously known low mass young stellar objects associated with the nebula : the illuminating star IRS 2 ( Class III , Einstein X-ray source CHX 7 ) , the brightest far-infrared source IRS 4 ( Class I ) , and the weak X-ray source CHX10a ( Class III ) .
The other young stellar objects in the region , including the Class 0 protostar candidate Cha-MMS1 , were not detected .
The radio spectral index of IRS 4 ( \alpha = 1.7 \pm 0.3 ) is consistent with optically thick free-free emission arising from a dense ionized region , probably a jet-induced shock occurring in the circumstellar material .
As the only Class I protostar with a ’ thermal jet ’ IRS 4 is the strongest candidate for the central source of the molecular outflow found previously in the region .
The emission from IRS 2 has a flat spectrum ( \alpha = 0.05 \pm 0.05 ) but shows no sign of polarization , and therefore its origin is likely to be optically thin free-free emission either from ionized wind or a collimated jet .
The strongest source detected in this survey is a new compact object with a steep negative spectral index ( -1.1 ) and a weak linear polarization ( \sim 2 \% ) , which probably represents a background radio galaxy .