Table 1.
Summary of the 86 GHz GMVA observations of M87.
| Date (yyyy/mm/dd) (1) | Stations (2) | Beam (bmin × bmaj, bPA) (3) | Pol (4) | △ν (MHz) (5) | Peak (mJy beam−1) (6) | rms (mJy beam−1) (7) |
|---|---|---|---|---|---|---|
| 2004/04/19 | EB, ON, PV, VLBAa | 71 × 267, –9.14 | L | 128 | 411 | 0.26 |
| 2005/10/15 | EB, ON, PV, VLBA | 61 × 214, –5.04 | L | 128 | 408 | 0.27 |
| 2009/05/09–10b | EB, ON, PB(6), VLBA | 72 × 272, –10.3 | L | 128 | 758 | 0.24 |
| 2014/02/26 | GBT, VLBA | 116 × 307, –9.0 | L&R | 512 | 496 | 0.14 |
| 2015/05/16 | EB, ON, PV, PB(50), GBT, VLBA | 59 × 273, –6.88 | L&R | 512c | 351 | 0.16 |
Notes. Station abbreviations are: EB – Effelsberg, ON – Onsala, PV – the IRAM 30 m telescope at Pico Veleta, PB – the phased Plateau de Bure interferometer (number of the phased antennas in brackets), GBT – the Green Bank Telescope, and VLBA – 8 VLBA stations equipped with 3 mm receiver (without Hancock and Saint Croix). The synthetic beam sizes are for natural weighting; angle denotes the position angle of the major axis. Columns denote: (1) observing date; (2) participating stations; (3) beam sizes: major axis and minor axis (in μas), and position angle (in deg); (4) receiver polarization (L = LCP; R = RCP); (5) total bandwidth; (6, 7) peak and rms noise level in the resulting images.
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