Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 462, Issue 2, Pages 1382-1392Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1743
Keywords
accretion, accretion discs; techniques: interferometric; galaxies: active-galaxies: jets; radio continuum: galaxies
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Funding
- ERC [610058]
- CONACyT, Mexico
- DGAPA, UNAM
- European Research Council (ERC) [610058] Funding Source: European Research Council (ERC)
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We present the results of a closure phase analysis of 3 mm very long baseline interferometry measurements performed on Sagittarius A* (Sgr A*). We have analysed observations made in 2015 May using the Very Long Baseline Array, the Robert C. Byrd Green Bank Telescope and the Large Millimeter Telescope Alfonso Serrano and obtained non-zero closure phase measurements on several station triangles - indicative of a non-point-symmetric source structure. The data are fitted with an asymmetric source structure model in Sgr A*, represented by a simple two-component model, which favours a fainter component due east of the main source. This result is discussed in light of a scattering screen with substructure or an intrinsically asymmetric source.
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