Spectral Indices of Outflow Sources at Centimeter Wavelengths

Details Spectral Indices of Outflow Sources at Centimeter Wavelengths Spectral Indices of Outflow Sources at Centimeter Wavelengths

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..302b&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

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Nine regions containing molecular or HH outflows (Lk Hα 198, Mon R2E, S287, L1654, L483, PV Cephei, L1203, L1251A, and CB 247) have been observed with the VLA at 6 cm. The regions had been observed previously at 3.6 cm, and 10 radio continuum sources, associated with low bolometric luminosity YSOs, had been detected toward the center of symmetry of outflows. At 6 cm we detected in the 9 regions a total of 58 sources above a 5σ level. The spectral index α, where Sνproptoνα, has been estimated for 36 of the sources. Most of the outflow central sources have a spectral index α>=-0.1, consistent with optically thin or partially thick thermal free-free emission from small ionized, collimated outflows; i.e., thermal radio jets. We discuss the possible mechanisms that can originate the required ionization and the constraints on the physical and morphological parameters of the sources. We have also estimated the distance from the central object where the ionization takes place. The results indicate that the ionization originates at a few AU of the star. Most of the non-central sources are characterized by non thermal emission (α<-0.1), and are probably background objects not associated with the star forming regions.

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