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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.

(a)

Brewster was not available;

(b)

Observations in 2009 were conducted over two consecutive days;

(c)

PB observed with a reduced bandwidth of 256 MHz (1 Gbps recording rate).

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