Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Asymmetric structure in Sgr A* at 3mm from closure phase measurements
  with VLBA, GBT and LMT   We present the results of a closure phase analysis of 3 mm very long baseline
interferometry (VLBI) measurements performed on Sagittarius A* (Sgr A*). We
have analyzed observations made in May 2015 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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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph