Using space-VLBI to probe gravity around Sgr A* | Astronomy & Astrophysics (A&A)

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Table 2.

Effective antenna diameter d (for single telescopes this corresponds to the diameter of the dish) and system equivalent flux density (SEFD) used for the ground and space antennas (see Event Horizon Telescope Collaboration 2019b, for details).

Telescope	d_eff [m]	SEFD [Jy]
ALMA ^(a)	73	74
APEX	12	4700
JCMT	15	10 500
LMT	32.5	4500
NOEMA ^(*)	52	700
PV	30	1900
SMT	10	17 100
SMA ^(b)	14.7	6200
SPT ^(c)	6	19 300
Space antenna ^(*)	8	20 000

Notes.

^(*)

Only used for the space-EHT configuration.

^(a)

For EHT 2017 ALMA used 37 × 12 m.

^(b)

For EHT 2017 SMA used 6 × 6 m.

^(c)

For EHT 2017 SPT was under-illuminated with an effective diameter of 6 m.

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