Radio emission and absorption regions in SS 433

We present multi-frequency VLBI observations of SS 433 at 1.6, 5, and 15 GHz. The central region of the source is resolved and shows a double core-wing structure with a central gap, resolvable only at high frequency. Spectral properties of these components indicate that free-free absorption occurs,...

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Bibliographic Details
Published inNew astronomy reviews Vol. 42; no. 9; pp. 641 - 643
Main Authors Paragi, Z., Vermeulen, R.C., Fejes, I., Schilizzi, R.T., Spencer, R.E., Stirling, A.M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.1998
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Summary:We present multi-frequency VLBI observations of SS 433 at 1.6, 5, and 15 GHz. The central region of the source is resolved and shows a double core-wing structure with a central gap, resolvable only at high frequency. Spectral properties of these components indicate that free-free absorption occurs, but only towards the innermost part of the jets. We have also discovered an extended emission region which is nearly perpendicular to the twin jets and has a steep spectrum. Possibly, our observations indicate the presence of a large, flattened structure in the equatorial plane of the system.
ISSN:1387-6473
1872-9630
DOI:10.1016/S1387-6473(98)00090-6