Volume 401, Number 3, April III 2003
|Page(s)||1017 - 1022|
|Section||Interstellar and circumstellar matter|
|Published online||01 April 2003|
Centimetre continuum emission from young stellar objects in Cederblad 110
Observatory, Tähtitorninmäki, PO Box 14, 00014, University of Helsinki, Finland
2 Department of Astronomy, 215 Space Sciences Building, Cornell University, Ithaca, NY 14853-6801, USA
Corresponding author: K. Lehtinen, firstname.lastname@example.org
Accepted: 31 January 2003
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 () 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 () 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 (~), which probably represents a background radio galaxy.
Key words: stars: formation / ISM: individual objects: Cederblad 110 / ISM: clouds / radio continuum: ISM
© ESO, 2003
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