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Table 1

Log of observations at 86 GHz (3 mm) and characteristics of the clean maps shown in Fig. 1.

Date Array Beam FWHM
[ mas,deg ]

08/05/2009 VLBA_3mm, On, 0.12 × 0.05, −4.2°
Eb, PdB, PV
10/10/2009 VLBA_3mm, On, 0.10 × 0.04, −1.9°
Eb, PdB, PV
07/05/2010 VLBA_3mm, On, 0.11 × 0.04, −7.1°
Eb, PdB, PV, Mh

Notes. Column 1: Date of observation. Column 2: Array. VLBA_3mm indicates the part of the Very Long Baseline Array (all but the Hancock and St. Croix antennas) which is equipped with 86 GHz receivers; On – Onsala 20 m; Eb – Effelsberg 100-m; PdB – Plateau de Bure Interferometer; PV – IRAM 30-m atop Pico Veleta; Mh – Metsähovi. Column 3: Beam FWHM and position angle for untapered data with uniform weighting.

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