Micro-arcsecond structure of Sagittarius A∗ revealed by high-sensitivity 86 GHz VLBI observations

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Table 1.

Image and observational parameters (natural weighting).

Date (Project ID)	Source	Array configuration^a	Beam	Beam PA	rms
yyyy-mm-dd			(mas)		(Jy beam⁻¹)
2015-05-22 (BF114A)	NRAO 530	VLBA+LMT	0.107 × 0.204	3.0°	0.0004
2015-05-23 (BF114B)	NRAO 530	VLBA+LMT+GBT	0.100 × 0.225	−6.3°	0.0003
2015-05-22 (BF114A)	Sgr A^∗	VLBA+LMT	0.541 × 0.165	38.5°	0.0010
2015-05-23 (BF114B)	Sgr A^∗	VLBA+LMT+GBT	0.147 × 0.286	6.4°	0.0005

Notes.

^(a)

For VLBA: Brewster (BR), Fort Davis (FD), Kitt Peak (KP), Los Alamos (LA), Mauna Kea (MK), North Liberty (NL), OVRO (OV) and Pie Town (PT). We note that for Sgr A^∗ no fringes were detected to MK, which results in a larger beam size for Sgr A^∗ than for NRAO 530.

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