Radio continuum emission and water masers towards CB 54
Abstract
We present high angular resolution observations of water masers at 1.3 cm and radio continuum emission at 1.3, 3.6 and 6 cm towards the Bok globule CB 54 using the Very Large Array. At 1.3 cm, with subarsecond angular resolution, we detect a radio continuum compact source located to the south-west of the globule and spatially coincident with a mid-infrared embedded object (MIR-b). The spectral index derived between 6 and 1.3 cm (alpha=0.3+/-0.4) is flat, consistent with optically thin free-free emission from ionized gas. We propose the shock-ionization scenario as a viable mechanism to produce the radio continuum emission observed at cm frequencies. Water masers are detected at two different positions separated by 2.3'', and coincide spatially with two mid-infrared sources: MIR-b and MIR-c. The association of these mid-IR sources with water masers confirms that they are likely protostars undergoing mass-loss, and they are the best candidate as driving sources of the molecular outflows in the region.
Keywords
Cite
@article{arxiv.0904.0736,
title = {Radio continuum emission and water masers towards CB 54},
author = {I. de Gregorio-Monsalvo and J. F. Gomez and G. Anglada and J. M. Torrelles and T. B. H. Kuiper and O. Suarez and N. A. Patel},
journal= {arXiv preprint arXiv:0904.0736},
year = {2015}
}
Comments
17 pages, 3 figures. Accepted for publication in AJ