Centimetre continuum emission from young stellar objects in Cederblad 110

Details Centimetre continuum emission from young stellar objects in Cederblad 110 Centimetre continuum emission from young stellar objects in Cederblad 110

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...401.1017l&link_type=abstract

Astronomy and Astrophysics, v.401, p.1017-1022 (2003)

Astronomy and Astrophysics

Astrophysics

10

Stars: Formation, Ism: Individual Objects: Cederblad 110, Ism: Clouds, Radio Continuum: Ism

Scientific paper

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 +/- 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 +/- 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 ( ~ 2 %), which probably represents a background radio galaxy.

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