Details

Autor(en) / Beteiligte

• Brinkerink, Christiaan D.
• Müller, Cornelia
• Falcke, Heino
• Bower, Geoffrey C.
• Krichbaum, Thomas P.
• Castillo, Edgar
• Deller, Adam T.
• Doeleman, Sheperd S.
• Fraga-Encinas, Raquel
• Goddi, Ciriaco
• Hernández-Gómez, Antonio
• Hughes, David H.
• Kramer, Michael
• Léon-Tavares, Jonathan
• Loinard, Laurent
• Montaña, Alfredo
• Mościbrodzka, Monika
• Ortiz-León, Gisela N.
• Sanchez-Arguelles, David
• Tilanus, Remo P. J.
• Wilson, Grant W.
• Zensus, J. Anton

Titel

Asymmetric structure in Sgr A at 3 mm from closure phase measurements with VLBA, GBT and LMT

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2016-10, Vol.462 (2), p.1382-1392

Ort / Verlag

London: Oxford University Press

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.